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Li H, Wang W, Xu J, Wang A, Wan X, Yang L, Zhao H, Shan Q, Zhao C, Sun S, Wang W. Mn-Based Mullites for Environmental and Energy Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2312685. [PMID: 38618925 DOI: 10.1002/adma.202312685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2023] [Revised: 03/26/2024] [Indexed: 04/16/2024]
Abstract
Mn-based mullite oxides AMn2O5 (A = lanthanide, Y, Bi) is a novel type of ternary catalyst in terms of their electronic and geometric structures. The coexistence of pyramid Mn3+-O and octahedral Mn4+-O makes the d-orbital selectively active toward various catalytic reactions. The alternative edge- and corner-sharing stacking configuration constructs the confined active sites and abundant active oxygen species. As a result, they tend to show superior catalytic behaviors and thus gain great attention in environmental treatment and energy conversion and storage. In environmental applications, Mn-based mullites have been demonstrated to be highly active toward low-temperature oxidization of CO, NO, volatile organic compounds (VOCs), etc. Recent research further shows that mullites decompose O3 and ozonize VOCs from -20 °C to room temperature. Moreover, mullites enhance oxygen reduction reactions (ORR) and sulfur reduction reactions (SRR), critical kinetic steps in air-battery and Li-S batteries, respectively. Their distinctive structures also facilitate applications in gas-sensitive sensing, ionic conduction, high mobility dielectrics, oxygen storage, piezoelectricity, dehydration, H2O2 decomposition, and beyond. A comprehensive review from basic physicochemical properties to application certainly not only gains a full picture of mullite oxides but also provides new insights into designing heterogeneous catalysts.
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Affiliation(s)
- Huan Li
- Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300071, China
| | - Wanying Wang
- Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300071, China
| | - Jinchao Xu
- Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300071, China
| | - Ansheng Wang
- Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300071, China
| | - Xiang Wan
- Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300071, China
| | - Liyuan Yang
- Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300071, China
| | - Haojun Zhao
- Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300071, China
| | - Qingyu Shan
- Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300071, China
| | - Chunning Zhao
- Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300071, China
| | - Shuhui Sun
- Institute National de la Recherche Scientifique (INRS), Centre Énergie Matériaux Télécommunications, Québec J3×1P7, Varennes, Canada
| | - Weichao Wang
- Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology, College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300071, China
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Terada N, Khalyavin DD, Manuel P, Orlandi F, Ridley CJ, Bull CL, Ono R, Solovyev I, Naka T, Prabhakaran D, Boothroyd AT. Room-Temperature Type-II Multiferroic Phase Induced by Pressure in Cupric Oxide. PHYSICAL REVIEW LETTERS 2022; 129:217601. [PMID: 36461960 DOI: 10.1103/physrevlett.129.217601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Accepted: 10/07/2022] [Indexed: 06/17/2023]
Abstract
According to previous theoretical work, the binary oxide CuO can become a room-temperature multiferroic via tuning of the superexchange interactions by application of pressure. Thus far, however, there has been no experimental evidence for the predicted room-temperature multiferroicity. Here, we show by neutron diffraction that the multiferroic phase in CuO reaches 295 K with the application of 18.5 GPa pressure. We also develop a spin Hamiltonian based on density functional theory and employing superexchange theory for the magnetic interactions, which can reproduce the experimental results. The present Letter provides a stimulus to develop room-temperature multiferroic materials by alternative methods based on existing low temperature compounds, such as epitaxial strain, for tunable multifunctional devices and memory applications.
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Affiliation(s)
- Noriki Terada
- National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki 305-0047, Japan
| | - Dmitry D Khalyavin
- ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - Pascal Manuel
- ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - Fabio Orlandi
- ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - Christopher J Ridley
- ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - Craig L Bull
- ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
- EaStCHEM School of Chemistry, The University of Edinburgh, Kings Buildings, David Brewster Road, Edinburgh EH9 3FJ, United Kingdom
| | - Ryota Ono
- Italian Institute of Technology, Via Morego, 30 16163 Genoa, Italy
| | - Igor Solovyev
- National Institute for Materials Science, MANA, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Institute of Metal Physics, S. Kovalevskaya street 18, 620108 Ekaterinburg, Russia
- Department of Theoretical Physics and Applied Mathematics, Ural Federal University, Mira street 19, 620002 Ekaterinburg, Russia
| | - Takashi Naka
- National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki 305-0047, Japan
| | - Dharmalingam Prabhakaran
- Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom
| | - Andrew T Boothroyd
- Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom
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Topologically protected magnetoelectric switching in a multiferroic. Nature 2022; 607:81-85. [PMID: 35794266 DOI: 10.1038/s41586-022-04851-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Accepted: 05/11/2022] [Indexed: 11/08/2022]
Abstract
Electric control of magnetism and magnetic control of ferroelectricity can improve the energy efficiency of magnetic memory and data-processing devices1. However, the necessary magnetoelectric switching is hard to achieve, and requires more than just a coupling between the spin and the charge degrees of freedom2-5. Here we show that an application and subsequent removal of a magnetic field reverses the electric polarization of the multiferroic GdMn2O5, thus requiring two cycles to bring the system back to the original configuration. During this unusual hysteresis loop, four states with different magnetic configurations are visited by the system, with one half of all spins undergoing unidirectional full-circle rotation in increments of about 90 degrees. Therefore, GdMn2O5 acts as a magnetic crankshaft that converts the back-and-forth variations of the magnetic field into a circular spin motion. This peculiar four-state magnetoelectric switching emerges as a topologically protected boundary between different two-state switching regimes. Our findings establish a paradigm of topologically protected switching phenomena in ferroic materials.
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Zhang X, Liu W, Wang H, Zhao X, Zhang Z, Nienhaus GU, Shang L, Su Z. Self-assembled thermosensitive luminescent nanoparticles with peptide-Au conjugates for cellular imaging and drug delivery. CHINESE CHEM LETT 2020. [DOI: 10.1016/j.cclet.2019.06.032] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Shi J, Wang J, He H, Lu Y, Shi Z. Rodlike YMn 2O 5 Powders Derived from Hydrothermal Process Using Oxygen as Oxidant. MATERIALS 2020; 13:ma13030805. [PMID: 32050610 PMCID: PMC7040780 DOI: 10.3390/ma13030805] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 02/06/2020] [Accepted: 02/06/2020] [Indexed: 11/16/2022]
Abstract
A facile approach is proposed herein to fabricate YMn2O5 powders with the hydrothermal method with oxygen as an oxidant. The structure and morphology of the as-synthesized YMn2O5 powders were characterized by XRD, SEM, and high-resolution transmission electron microscopy (HRTEM). The results manifested that the main factors that affected the formation of the rod-like YMn2O5 structures were the stirring time, hydrothermal temperature, and hydrothermal time. The oxidation time in the air had a remarkable effect on the final product by oxidizing Mn2+ ions to Mn3+ ions and Mn4+ ions. The obtained YMn2O5 powder was single crystalline and possessed a nanorod morphology, where the growth direction was along the c axis. The possible formation mechanism involved a dissolution–crystallization mechanism. Under the 397 nm excitation, the Mn4+ ions exhibited an intense orange emission at 596 nm. The energy bandgap of YMn2O5 powders was 1.18 eV.
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Affiliation(s)
- Jun Shi
- Liaoning Key Laboratory for Fabrication and Application of Superfine Inorganic Powders, Dalian Jiaotong University, Dalian 110621, China; (J.S.); (H.H.); (Y.L.); (Z.S.)
| | - Jing Wang
- Liaoning Key Laboratory for Fabrication and Application of Superfine Inorganic Powders, Dalian Jiaotong University, Dalian 110621, China; (J.S.); (H.H.); (Y.L.); (Z.S.)
- Correspondence: ; Tel.: +86-0411-8410-9776
| | - Huifen He
- Liaoning Key Laboratory for Fabrication and Application of Superfine Inorganic Powders, Dalian Jiaotong University, Dalian 110621, China; (J.S.); (H.H.); (Y.L.); (Z.S.)
| | - Yang Lu
- Liaoning Key Laboratory for Fabrication and Application of Superfine Inorganic Powders, Dalian Jiaotong University, Dalian 110621, China; (J.S.); (H.H.); (Y.L.); (Z.S.)
- Department of Materials Science and Engineering, Yingkou Institute of Technology, Yingkou 115014, China
| | - Zhongxiang Shi
- Liaoning Key Laboratory for Fabrication and Application of Superfine Inorganic Powders, Dalian Jiaotong University, Dalian 110621, China; (J.S.); (H.H.); (Y.L.); (Z.S.)
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Li Y, Yao K. Theoretical investigation of multiferroic metal-organic framework magnet [CH 3NH 3][Co(HCOO) 3]: Green's function method. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:405802. [PMID: 30210063 DOI: 10.1088/1361-648x/aadc80] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
For the first presented magnetic ordering-induced multiferroics with a metal-organic framework (MOF) of formula [CH3NH3][Co(HCOO)3], we theoretically investigate its multiple ferroics. It is found that Dzyaloshinskii-Moriya interaction is a main cause that leads to non-zero magnetization, and electric polarization, and the induced electric polarization can be regulated by magnetic fields. As an assistant mechanism, magnon-magnon interaction and quantum fluctuation play an important role on ferroelectrics and magnetism. Our methods are based on the double-time Green's function and Holstein-Primakoff transformation. Theoretical results can be compared with experiments, though there are some discrepancies.
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Affiliation(s)
- Yin Li
- School of Physics and National High Magnetic Field Center, Huazhong University of Science and Technology, 430074, Wuhan, People's Republic of China
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Shang T, Canévet E, Morin M, Sheptyakov D, Fernández-Díaz MT, Pomjakushina E, Medarde M. Design of magnetic spirals in layered perovskites: Extending the stability range far beyond room temperature. SCIENCE ADVANCES 2018; 4:eaau6386. [PMID: 30397653 PMCID: PMC6203228 DOI: 10.1126/sciadv.aau6386] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Accepted: 09/19/2018] [Indexed: 06/08/2023]
Abstract
In insulating materials with ordered magnetic spiral phases, ferroelectricity can emerge owing to the breaking of inversion symmetry. This property is of both fundamental and practical interest, particularly with a view to exploiting it in low-power electronic devices. Advances toward technological applications have been hindered, however, by the relatively low ordering temperatures T spiral of most magnetic spiral phases, which rarely exceed 100 K. We have recently established that the ordering temperature of a magnetic spiral can be increased up to 310 K by the introduction of chemical disorder. Here, we explore the design space opened up by this novel mechanism by combining it with a targeted lattice control of some magnetic interactions. In Cu-Fe layered perovskites, we obtain T spiral values close to 400 K, comfortably far from room temperature and almost 100 K higher than using chemical disorder alone. Moreover, we reveal a linear relationship between the spiral's wave vector and the onset temperature of the spiral phase. This linear law ends at a paramagnetic-collinear-spiral triple point, which defines the highest spiral ordering temperature that can be achieved in this class of materials. On the basis of these findings, we propose a general set of rules for designing magnetic spirals in layered perovskites using external pressure, chemical substitutions, and/or epitaxial strain, which should guide future efforts to engineer magnetic spiral phases with ordering temperatures suitable for technological applications.
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Affiliation(s)
- Tian Shang
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
- Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Emmanuel Canévet
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
- Department of Physics, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Mickaël Morin
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
- Excelsus Structural Solutions (Swiss) AG PARK innovAARE, CH-5234 Villigen, Switzerland
| | - Denis Sheptyakov
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | | | - Ekaterina Pomjakushina
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
| | - Marisa Medarde
- Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
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8
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Zobkalo IA, Gavrilov SV, Sazonov A, Hutanu V. Investigation of TbMn 2O 5 by polarized neutron diffraction. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:205804. [PMID: 29651995 DOI: 10.1088/1361-648x/aabdf6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In order to make a new approach to the elucidation of the microscopic mechanisms of multiferroicity in the RMn2O5 family, experiments with different methods of polarized neutrons scattering were performed on a TbMn2O5 single crystal. We employed three different techniques of polarized neutron diffraction without the analysis after scattering, the XYZ-polarization analysis, and technique of spherical neutron polarimetry (SNP). Measurements with SNP were undertaken both with and without external electric field. A characteristic difference in the population of 'right' and 'left' helix domains in all magnetically ordered phases of TbMn2O5, was observed. This difference can be controlled by an external electric field in the field-cooled mode. The analysis of the results gives an evidence that antisymmetric Dzyaloshinsky-Moria exchange is effective in all the magnetic phases in TbMn2O5.
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Affiliation(s)
- I A Zobkalo
- B.P. Konstantinov Petersburg Nuclear Physics Institute, NRC Kurchatov Institute, Gatchina, 188300, Russia. Saint-Petersburg State University, Saint-Petersburg, 199034, Russia
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9
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Chun SH, Shin KW, Kim HJ, Jung S, Park J, Bahk YM, Park HR, Kyoung J, Choi DH, Kim DS, Park GS, Mitchell JF, Kim KH. Electromagnon with Sensitive Terahertz Magnetochromism in a Room-Temperature Magnetoelectric Hexaferrite. PHYSICAL REVIEW LETTERS 2018; 120:027202. [PMID: 29376720 DOI: 10.1103/physrevlett.120.027202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2017] [Indexed: 06/07/2023]
Abstract
An electromagnon in the magnetoelectric (ME) hexaferrite Ba_{0.5}Sr_{2.5}Co_{2}Fe_{24}O_{41} (Co_{2}Z-type) single crystal is identified by time-domain terahertz (THz) spectroscopy. The associated THz resonance is active on the electric field (E^{ω}) of the THz light parallel to the c axis (∥ [001]), whose spectral weight develops at a markedly high temperature, coinciding with a transverse conical magnetic order below 410 K. The resonance frequency of 1.03 THz at 20 K changes -8.7% and +5.8% under external magnetic field (H) of 2 kOe along [001] and [120], respectively. A model Hamiltonian describing the conical magnetic order elucidates that the dynamical ME effect arises from antiphase motion of spins which are coupled with modulating electric dipoles through the exchange striction mechanism. Moreover, the calculated frequency shift points to the key role of the Dzyaloshinskii-Moriya interaction that is altered by static electric polarization change under different H.
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Affiliation(s)
- Sae Hwan Chun
- CeNSCMR, Department of Physics and Astronomy, Seoul National University, Seoul 08826, South Korea
| | - Kwang Woo Shin
- CeNSCMR, Department of Physics and Astronomy, Seoul National University, Seoul 08826, South Korea
| | - Hyung Joon Kim
- CeNSCMR, Department of Physics and Astronomy, Seoul National University, Seoul 08826, South Korea
| | - Seonghoon Jung
- Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Jaehun Park
- Pohang Accelerator Laboratory, Pohang, Gyeongbuk 37673, South Korea
| | - Young-Mi Bahk
- Nano Optics Group, Department of Physics and Astronomy, Seoul National University, Seoul 08826, South Korea
| | - Hyeong-Ryeol Park
- Nano Optics Group, Department of Physics and Astronomy, Seoul National University, Seoul 08826, South Korea
| | - Jisoo Kyoung
- Nano Optics Group, Department of Physics and Astronomy, Seoul National University, Seoul 08826, South Korea
| | - Da-Hye Choi
- Center for THz-driven Biomedical Systems, Department of Physics and Astronomy, Seoul National University, Seoul 08826, South Korea
| | - Dai-Sik Kim
- Nano Optics Group, Department of Physics and Astronomy, Seoul National University, Seoul 08826, South Korea
| | - Gun-Sik Park
- Center for THz-driven Biomedical Systems, Department of Physics and Astronomy, Seoul National University, Seoul 08826, South Korea
| | - J F Mitchell
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60540, USA
| | - Kee Hoon Kim
- CeNSCMR, Department of Physics and Astronomy, Seoul National University, Seoul 08826, South Korea
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11
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Zhou L, Dai J, Chai Y, Zhang H, Dong S, Cao H, Calder S, Yin Y, Wang X, Shen X, Liu Z, Saito T, Shimakawa Y, Hojo H, Ikuhara Y, Azuma M, Hu Z, Sun Y, Jin C, Long Y. Realization of Large Electric Polarization and Strong Magnetoelectric Coupling in BiMn 3 Cr 4 O 12. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1703435. [PMID: 28991383 DOI: 10.1002/adma.201703435] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 08/25/2017] [Indexed: 06/07/2023]
Abstract
Magnetoelectric multiferroics have received much attention in the past decade due to their interesting physics and promising multifunctional performance. For practical applications, simultaneous large ferroelectric polarization and strong magnetoelectric coupling are preferred. However, these two properties have not been found to be compatible in the single-phase multiferroic materials discovered as yet. Here, it is shown that superior multiferroic properties exist in the A-site ordered perovskite BiMn3 Cr4 O12 synthesized under high-pressure and high-temperature conditions. The compound experiences a ferroelectric phase transition ascribed to the 6s2 lone-pair effects of Bi3+ at around 135 K, and a long-range antiferromagnetic order related to the Cr3+ spins around 125 K, leading to the presence of a type-I multiferroic phase with huge electric polarization. On further cooling to 48 K, a type-II multiferroic phase induced by the special spin structure composed of both Mn- and Cr-sublattices emerges, accompanied by considerable magnetoelectric coupling. BiMn3 Cr4 O12 thus provides a rare example of joint multiferroicity, where two different types of multiferroic phases develop subsequently so that both large polarization and significant magnetoelectric effect are achieved in a single-phase multiferroic material.
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Affiliation(s)
- Long Zhou
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Jianhong Dai
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Yisheng Chai
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Huimin Zhang
- School of Physics, Southeast University, Nanjing, 211189, China
| | - Shuai Dong
- School of Physics, Southeast University, Nanjing, 211189, China
| | - Huibo Cao
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Stuart Calder
- Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Yunyu Yin
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Xiao Wang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Xudong Shen
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Zhehong Liu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Takashi Saito
- Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan
| | - Yuichi Shimakawa
- Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan
| | - Hajime Hojo
- Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
| | - Yuichi Ikuhara
- Institute of Engineering Innovation, University of Tokyo, Bunkyo, Tokyo, 113-8656, Japan
| | - Masaki Azuma
- Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
| | - Zhiwei Hu
- Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany
| | - Young Sun
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Changqing Jin
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing, 100190, China
| | - Youwen Long
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China
- Collaborative Innovation Center of Quantum Matter, Beijing, 100190, China
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Sinclair R, Cao HB, Garlea VO, Lee M, Choi ES, Dun ZL, Dong S, Dagotto E, Zhou HD. Canted magnetic ground state of quarter-doped manganites R 0.75Ca 0.25MnO 3 (R = Y, Tb, Dy, Ho, and Er). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:065802. [PMID: 28002058 DOI: 10.1088/1361-648x/aa4de1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Polycrystalline samples of the quarter-doped manganites R 0.75Ca0.25MnO3 (R = Y, Tb, Dy, Ho, and Er) were studied by x-ray diffraction and AC/DC susceptibility measurements. All five samples are orthorhombic and exhibit similar magnetic properties: enhanced ferromagnetism below T 1 (∼80 K) and a spin glass (SG) state below T SG (∼30 K). With increasing R 3+ ionic size, both T 1 and T SG generally increase. The single crystal neutron diffraction results on Tb0.75Ca0.25MnO3 revealed that the SG state is mainly composed of a short-range ordered version of a novel canted (i.e. noncollinear) antiferromagnetic spin state. Furthermore, calculations based on the double exchange model for quarter-doped manganites reveal that this new magnetic phase provides a transition state between the ferromagnetic state and the theoretically predicted spin-orthogonal stripe phase.
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Affiliation(s)
- R Sinclair
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996-1200, USA
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Zheng T, Yue Z, Wallace GG, Du Y, Martins P, Lanceros-Mendez S, Higgins MJ. Local probing of magnetoelectric properties of PVDF/Fe 3O 4 electrospun nanofibers by piezoresponse force microscopy. NANOTECHNOLOGY 2017; 28:065707. [PMID: 28059063 DOI: 10.1088/1361-6528/aa5217] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The coupling of magnetic and electric properties in polymer-based magnetoelectric composites offers new opportunities to develop contactless electrodes, effectively without electrical connections, for less-invasive integration into devices such as energy harvesters, sensors, wearable and implantable electrodes. Understanding the macroscale-to-nanoscale conversion of the properties is important, as nanostructured and nanoscale magnetoelectric structures are increasingly fabricated. However, whilst the magnetoelectric effect at the macroscale is well established both theoretically and experimentally, it remains unclear how this effect translates to the nanoscale, or vice versa. Here, PVDF/Fe3O4 polymer-based composite nanofibers are fabricated using electrospinning to investigate their piezoelectric and magnetoelectric properties at the single nanofiber level.
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Affiliation(s)
- Tian Zheng
- ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute/AIIM Faculty, Innovation Campus, Squires Way, University of Wollongong NSW 2522, Australia
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Wang Y, Zhao H, Zhang L, Chen J, Xing X. PbTiO3-based perovskite ferroelectric and multiferroic thin films. Phys Chem Chem Phys 2017; 19:17493-17515. [DOI: 10.1039/c7cp01347g] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ferroelectric thin films, especially PbTiO3-based perovskite thin films which possess robust spontaneous electrical polarization, are widely investigated and applied in various devices.
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Affiliation(s)
- Yilin Wang
- Department of Physical Chemistry
- University of Science and Technology Beijing
- Beijing 100083
- China
| | - Hanqing Zhao
- Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province
- Taiyuan University of Technology
- China
| | - Linxing Zhang
- Department of Physical Chemistry
- University of Science and Technology Beijing
- Beijing 100083
- China
| | - Jun Chen
- Department of Physical Chemistry
- University of Science and Technology Beijing
- Beijing 100083
- China
| | - Xianran Xing
- Department of Physical Chemistry
- University of Science and Technology Beijing
- Beijing 100083
- China
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15
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Popov AI, Zvezdin KA, Gareeva ZV, Mazhitova FA, Vakhitov RM, Yumaguzin AR, Zvezdin AK. Ferroelectricity of domain walls in rare earth iron garnet films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:456004. [PMID: 27620369 DOI: 10.1088/0953-8984/28/45/456004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In this paper, we report on electric polarization arising in a vicinity of Bloch-like domain walls in rare-earth iron garnet films. The domain walls generate an intrinsic magnetic field that breaks an antiferroelectric structure formed in the garnets due to an exchange interaction between rare earth and iron sublattices. We explore 180° domain walls whose formation is energetically preferable in the films with perpendicular magnetic anisotropy. Magnetic and electric structures of the 180° quasi-Bloch domain walls have been simulated at various relations between system parameters. Singlet, doublet ground states of rare earth ions and strongly anisotropic rare earth Ising ions have been considered. Our results show that electric polarization appears in rare earth garnet films at Bloch domain walls, and the maximum of magnetic inhomogeneity is not always linked to the maximum of electric polarization. A number of factors including the temperature, the state of the rare earth ion and the type of a wall influence magnetically induced electric polarization. We show that the value of polarization can be enhanced by the shrinking of the Bloch domain wall width, decreasing the temperature, and increasing the deviations of magnetization from the Bloch rotation that are regulated by impacts given by magnetic anisotropies of the films.
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Affiliation(s)
- A I Popov
- Moscow Institute of Physics and Technology (State University), 141700, Dolgoprudny, Moscow, Russia. National Research University of Electronic Technology, 124498, Zelenograd, Moscow, Russia
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16
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Yang L, Li X, Liu MF, Li PL, Yan ZB, Zeng M, Qin MH, Gao XS, Liu JM. Understanding the multiferroicity in TmMn 2O 5 by a magnetically induced ferrielectric model. Sci Rep 2016; 6:34767. [PMID: 27713482 PMCID: PMC5054431 DOI: 10.1038/srep34767] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 09/19/2016] [Indexed: 11/30/2022] Open
Abstract
The magnetically induced electric polarization behaviors in multiferroic TmMn2O5 in response to varying temperature and magnetic field are carefully investigated by means of a series of characterizations including the high precision pyroelectric current technique. Here polycrystalline rather than single crystal samples are used for avoiding the strong electrically self-polarized effect in single crystals, and various parallel experiments on excluding the thermally excited current contributions are performed. The temperature-dependent electric polarization flop as a major character is identified for different measuring paths. The magneto-current measurements indicate that the electric polarization in the low temperature magnetic phase region has different origin from that in the high temperature magnetic phase. It is suggested that the electric polarization does have multiple components which align along different orientations, including the Mn3+-Mn4+-Mn3+ exchange striction induced polarization PMM, the Tm3+-Mn4+-Tm3+ exchange striction induced polarization PTM, and the low temperature polarization PLT probably associated with the Tm3+ commensurate phase. The observed electric polarization flop can be reasonably explained by the ferrielectric model proposed earlier for DyMn2O5, where PMM and PTM are the two antiparallel components both along the b-axis and PLT may align along the a-axis. Finally, several issues on the unusual temperature dependence of ferroelectric polarizations are discussed.
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Affiliation(s)
- L Yang
- Institute for Advanced Materials and Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China
| | - X Li
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
| | - M F Liu
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
| | - P L Li
- Institute for Advanced Materials and Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China
| | - Z B Yan
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
| | - M Zeng
- Institute for Advanced Materials and Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China
| | - M H Qin
- Institute for Advanced Materials and Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China
| | - X S Gao
- Institute for Advanced Materials and Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China
| | - J-M Liu
- Institute for Advanced Materials and Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China.,Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.,Institute for Advanced Materials, Hubei Normal University, Huangshi 435003, China
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17
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Orlandi F, Righi L, Mezzadri F, Manuel P, Khalyavin DD, Delmonte D, Pernechele C, Cabassi R, Bolzoni F, Solzi M, Calestani G. Improper Ferroelectric Contributions in the Double Perovskite Pb2Mn0.6Co0.4WO6 System with a Collinear Magnetic Structure. Inorg Chem 2016; 55:4381-90. [PMID: 27078522 DOI: 10.1021/acs.inorgchem.6b00117] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The physical characterization and the extended crystallographic study of the double perovskite system Pb2Mn0.6Co0.4WO6 indicate an improper ferroelectric contribution to the polarization induced by the magnetic ordering. In the paramagnetic phase, the compound displays a centrosymmetric orthorhombic double perovskite structure with the Pmcn1' symmetry. The structure is strongly distorted by the lead stereoactivity. Magnetization measurements show two magnetic transitions at 188 and 9 K, but the time-of-flight neutron diffraction data provide evidence for a long-range magnetic ordering only below the second transition. Quantitative structure refinements combined with a comprehensive symmetry analysis indicate the Pm'c21' magnetic space group to be the adequate symmetry to describe the structural distortions and spin ordering in the ground state of the system. The symmetry implies a coexistence of a spontaneous ferromagnetic moment and a ferroelectric polarization along the orthogonal b- and c-axes, respectively, in the long-range ordered structure. Macroscopic measurements confirm the presence of the spontaneous polarization also below the first transition at 188 K, where only short-range magnetic correlations are evidenced by diffuse scattering in neutron diffraction.
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Affiliation(s)
- Fabio Orlandi
- Dipartimento di Chimica, Università di Parma , Parco Area delle Scienze 17/A, 43124 Parma, Italy.,ISIS Pulsed Neutron Facility, STFC, Rutherford Appleton Laboratory , Chilton, Didcot, Oxfordshire OX11-0QX, United Kingdom
| | - Lara Righi
- Dipartimento di Chimica, Università di Parma , Parco Area delle Scienze 17/A, 43124 Parma, Italy.,IMEM-CNR , Parco Area delle Scienze 37/A, 43124 Parma, Italy
| | - Francesco Mezzadri
- Dipartimento di Chimica, Università di Parma , Parco Area delle Scienze 17/A, 43124 Parma, Italy.,IMEM-CNR , Parco Area delle Scienze 37/A, 43124 Parma, Italy
| | - Pascal Manuel
- ISIS Pulsed Neutron Facility, STFC, Rutherford Appleton Laboratory , Chilton, Didcot, Oxfordshire OX11-0QX, United Kingdom
| | - Dmitry D Khalyavin
- ISIS Pulsed Neutron Facility, STFC, Rutherford Appleton Laboratory , Chilton, Didcot, Oxfordshire OX11-0QX, United Kingdom
| | - Davide Delmonte
- Dipartimento di Fisica e Scienze della Terra, Università di Parma , Parco Area delle Scienze 7/A, 43124 Parma, Italy.,IMEM-CNR , Parco Area delle Scienze 37/A, 43124 Parma, Italy
| | - Chiara Pernechele
- Dipartimento di Fisica e Scienze della Terra, Università di Parma , Parco Area delle Scienze 7/A, 43124 Parma, Italy
| | | | - Fulvio Bolzoni
- IMEM-CNR , Parco Area delle Scienze 37/A, 43124 Parma, Italy
| | - Massimo Solzi
- Dipartimento di Fisica e Scienze della Terra, Università di Parma , Parco Area delle Scienze 7/A, 43124 Parma, Italy
| | - Gianluca Calestani
- Dipartimento di Chimica, Università di Parma , Parco Area delle Scienze 17/A, 43124 Parma, Italy.,IMEM-CNR , Parco Area delle Scienze 37/A, 43124 Parma, Italy
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18
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Liu M, Zhang H, Huang X, Ma C, Dong S, Liu JM. Two-Step Antiferromagnetic Transitions and Ferroelectricity in Spin-1 Triangular-Lattice Antiferromagnetic Sr3NiTa2O9. Inorg Chem 2016; 55:2709-16. [PMID: 26934503 DOI: 10.1021/acs.inorgchem.5b02270] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
We report the low-temperature characterizations on structural, specific heat, magnetic, and ferroelectric behaviors of transition metal oxide compound Sr3NiTa2O9. It is suggested that Sr3NiTa2O9 is a spin-1 triangular lattice Heisenberg quantum antiferromagnet which may have weak easy-axis anisotropy. At zero magnetic field, a two-step transition sequence at T(N1) = 3.35 K and T(N2) = 2.74 K, respectively, is observed, corresponding to the up-up-down (uud) spin ordering and 120° spin ordering, respectively. The two transition points shift gradually with increasing magnetic field toward the low temperature, accompanying an evolution from the 120° spin structure (phase) to the normal oblique phases. Ferroelectricity in the 120° phase is clearly identified. The first-principles calculations confirm the 120° phase as the ground state whose ferroelectricity originates mainly from the electronic polarization.
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Affiliation(s)
- Meifeng Liu
- Laboratory of Solid State Microstructures and Innovative Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China
| | - Huimin Zhang
- Department of Physics, Southeast University , Nanjing 211189, China
| | - Xin Huang
- Department of Physics, Southeast University , Nanjing 211189, China
| | - Chunyang Ma
- Laboratory of Solid State Microstructures and Innovative Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China
| | - Shuai Dong
- Department of Physics, Southeast University , Nanjing 211189, China
| | - Jun-Ming Liu
- Laboratory of Solid State Microstructures and Innovative Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.,Institute for Advanced Materials and Laboratory of Quantum Engineering and Materials, South China Normal University , Guangzhou 510006, China
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19
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Wan X, Ding HC, Savrasov SY, Duan CG. Short range magnetic exchange interaction favors ferroelectricity. Sci Rep 2016; 6:22743. [PMID: 26956480 PMCID: PMC4783704 DOI: 10.1038/srep22743] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Accepted: 02/19/2016] [Indexed: 11/29/2022] Open
Abstract
Multiferroics, where two or more ferroic order parameters coexist, is one of the hottest fields in condensed matter physics and materials science. To search multiferroics, currently most researches are focused on frustrated magnets, which usually have complicated magnetic structure and low magnetic ordering temperature. Here, we argue that actually simple interatomic magnetic exchange interaction already contains a driving force for ferroelectricity, thus providing a new microscopic mechanism for the coexistence and strong coupling between ferroelectricity and magnetism. We demonstrate this mechanism by showing that even the simplest antiferromagnetic insulator like MnO, could display a magnetically induced ferroelectricity under a biaxial strain. In addition, we show that such mechanism also exists in the most important single phase multiferroics, i.e. BiFeO3, suggesting that this mechanism is ubiquitous in systems with superexchange interaction.
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Affiliation(s)
- Xiangang Wan
- 1National Laboratory of Solid State Microstructures, College of Physics, Nanjing University, Nanjing 210093, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Hang-Chen Ding
- Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai, 200062, China
| | - Sergey Y. Savrasov
- Department of Physics, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA
| | - Chun-Gang Duan
- Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai, 200062, China
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20
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Mansouri S, Jandl S, Roberge B, Balli M, Dimitrov DZ, Orlita M, Faugeras C. Micro-Raman and infrared studies of multiferroic TbMn₂O₅. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:055901. [PMID: 26790102 DOI: 10.1088/0953-8984/28/5/055901] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We have studied the Raman and infrared spectral response of TbMn2O5 under an applied magnetic field parallel to the easy magnetic a-axis at 4.2 K. Strong spin-lattice coupling in TbMn2O5 is evidenced by a frequency shift of Raman and infrared phonons as a function of magnetic field compared to the phonon response of BiMn2O5 that remains unaffected. The magnetic field behavior of the highest frequency phonons retraces the polarization switching in TbMn2O5 and shows an important frequency softening below 3 T that is modulated by the J 3 and J 4 exchange parameters. The role of the Tb(3+) spin alignment with H is interpreted in terms of a local lattice striction and the contribution of the charge transfer mechanism to the magnetoelectric process is evaluated.
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Affiliation(s)
- S Mansouri
- Université de Sherbrooke, Département de Physique, 2500 Boulevard Université, Sherbrooke, Canada J1K 2R1
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21
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Song G, Zhang W. Comparative studies on the room-temperature ferrielectric and ferrimagnetic Ni3TeO6-type A2FeMoO6 compounds (A = Sc, Lu). Sci Rep 2016; 6:20133. [PMID: 26831406 PMCID: PMC4735590 DOI: 10.1038/srep20133] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Accepted: 12/30/2015] [Indexed: 11/28/2022] Open
Abstract
First-principles calculations have been carried out to study the structural, electric, and magnetic properties of Ni3TeO6-type A2FeMoO6 compounds (A = Sc, Lu). Their electric and magnetic properties behave like room-temperature ferrielectric and ferrimagnetic insulators where polarization comes from the un-cancelled antiparallel dipoles of (A(1), Fe3+) and (A(2), Mo3+) ion groups, and magnetization from un-cancelled antiparallel moments of Fe3+ and Mo3+ ions. The net polarization increases with A’s ionic radius and is 7.1 and 8.7 μCcm−2 for Sc2FeMoO6 and Lu2FeMoO6, respectively. The net magnetic moment is 2 μB per formula unit. The magnetic transition temperature is estimated well above room-temperature due to the strong antiferromagnetic superexchange coupling among Fe3+ and Mo3+ spins. The estimated paraelectric to ferrielectric transition temperature is also well above room-temperature. Moreover, strong magnetoelectric coupling is also anticipated because the magnetic ions are involved both in polarization and magnetization. The fully relaxed Ni3TeO6-type A2FeMoO6 structures are free from soft-phonon modes and correspond to stable structures. As a result, Ni3TeO6-type A2FeMoO6 compounds are possible candidates for room-temperature multiferroics with large magnetization and polarization.
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Affiliation(s)
- Guang Song
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
| | - Weiyi Zhang
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.,Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
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22
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Dobrokhotova ZV, Koroteev PS, Kirdyankin DI, Kiskin MA, Kovba ML, Efimov NN, Gavrikov AV, Tyurin AV, Novotortsev VM. Synthesis of lanthanide manganites LnMnO3 and LnMn2O5 from individual molecular precursors. RUSS J INORG CHEM+ 2015. [DOI: 10.1134/s0036023615120098] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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23
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Radaelli PG, Dhesi SS. The contribution of Diamond Light Source to the study of strongly correlated electron systems and complex magnetic structures. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2015; 373:rsta.2013.0148. [PMID: 25624510 DOI: 10.1098/rsta.2013.0148] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
We review some of the significant contributions to the field of strongly correlated materials and complex magnets, arising from experiments performed at the Diamond Light Source (Harwell Science and Innovation Campus, Didcot, UK) during the first few years of operation (2007-2014). We provide a comprehensive overview of Diamond research on topological insulators, multiferroics, complex oxides and magnetic nanostructures. Several experiments on ultrafast dynamics, magnetic imaging, photoemission electron microscopy, soft X-ray holography and resonant magnetic hard and soft X-ray scattering are described.
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Affiliation(s)
- P G Radaelli
- Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, UK
| | - S S Dhesi
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, UK
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24
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Fang YW, Ding HC, Tong WY, Zhu WJ, Shen X, Gong SJ, Wan XG, Duan CG. First-principles studies of multiferroic and magnetoelectric materials. Sci Bull (Beijing) 2015. [DOI: 10.1007/s11434-014-0628-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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25
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Terada N. Spin and orbital orderings behind multiferroicity in delafossite and related compounds. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:453202. [PMID: 25336518 DOI: 10.1088/0953-8984/26/45/453202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Coupling between noncollinear magnetic ordering and ferroelectricicty in magnetoelectric multiferroics has been extensively studied in the last decade. Delafossite family compounds with triangular lattice structure provide a great opportunity to study the coupling between spin and electric dipole in multiferroics due to the variety of magnetic phases with different symmetry. This review introduces the magnetic and ferroelectric phase transitions in delafossite ferrites, CuFe(1-x)X(x)O(2) (X = Al, Ga), AgFeO(2) and the related compound α-NaFeO(2). In CuFeO(2), the ferroelectric phase appears under a magnetic field or chemical substitution. The proper screw magnetic ordering with the magnetic point group 21', which has been determined by detailed analysis in neutron diffraction experiments, induces the ferroelectric polarization along the monoclinic b axis in CuFeO2. The cycloidal magnetic orderings are realized in AgFeO(2) and α-NaFeO(2), which are of the point group m1' allowing polarization in the ac plane. The emergence of ferroelectric polarization can be explained by both the extended inverse Dzyaloshinsky-Moriya effect and the d − p hybridization mechanism. These mechanisms are supported by experimental evidence in CuFe(1-x)Ga(x)O2. The polarized neutron diffraction experiment demonstrated one-to-one correspondence between ferroelectric polarization and spin helicity, S(i) × S(j). The incommensurate orbital ordering with 2 Q wave vector, observed by the soft x-ray resonant diffraction experiment, proved that the spin-orbit interaction ties spin and orbital orders to each other, playing a crucial role for the emergence of ferroelectricity in CuFe(1-x)Ga(x)O2.
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26
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Schenck H, Pokrovsky VL, Nattermann T. Vector chiral phases in the frustrated 2D XY model and quantum spin chains. PHYSICAL REVIEW LETTERS 2014; 112:157201. [PMID: 24785067 DOI: 10.1103/physrevlett.112.157201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Indexed: 06/03/2023]
Abstract
The phase diagram of the frustrated 2D classical and 1D quantum XY models is calculated analytically. Four transitions are found: the vortex unbinding transitions triggered by strong fluctuations occur above and below the chiral transition temperature. Vortex interaction is short range on small and logarithmic on large scales. The chiral transition, though belonging to the Ising universality class by symmetry, has different critical exponents due to nonlocal interaction. In a narrow region close to the Lifshitz point a reentrant phase transition between paramagnetic and quasiferromagnetic phase appears. Applications to antiferromagnetic quantum spin chains and multiferroics are discussed.
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Affiliation(s)
- H Schenck
- Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - V L Pokrovsky
- Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA and Landau Institute for Theoretical Physics, Chernogolovka, Moscow District 142432, Russia
| | - T Nattermann
- Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
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27
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Zhao ZY, Liu MF, Li X, Lin L, Yan ZB, Dong S, Liu JM. Experimental observation of ferrielectricity in multiferroic DyMn2O5. Sci Rep 2014; 4:3984. [PMID: 24496324 PMCID: PMC3913922 DOI: 10.1038/srep03984] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2013] [Accepted: 01/20/2014] [Indexed: 11/09/2022] Open
Abstract
One of the major breakthroughs associated with multiferroicity in recent years is the discovery of ferroelectricity generated by specific magnetic structures in some magnetic insulating oxides such as rare-earth manganites RMnO3 and RMn2O5. An unresolved issue is the small electric polarization. Relatively large electric polarization and strong magnetoelectric coupling have been found in those manganites of double magnetic ions: magnetic rare-earth R ion and Mn ion, due to the strong R-Mn (4f-3d) interactions. DyMn2O5 is a representative example. We unveil in this work the ferrielectric nature of DyMn2O5, in which the two ferroelectric sublattices with opposite electric polarizations constitute the ferrielectric state. One sublattice has its polarization generated by the symmetric exchange striction from the Mn-Mn interactions, while the polarization of the other sublattice is attributed to the symmetric exchange striction from the Dy-Mn interactions. We present detailed measurements on the electric polarization as a function of temperature, magnetic field, and measuring paths. The present experiments may be helpful for clarifying the puzzling issues on the multiferroicity in DyMn2O5 and other RMn2O5 multiferroics.
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Affiliation(s)
- Z Y Zhao
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
| | - M F Liu
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
| | - X Li
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
| | - L Lin
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
| | - Z B Yan
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
| | - S Dong
- Department of Physics, Southeast University, Nanjing 210189, China
| | - J-M Liu
- Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
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28
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Abstract
Single crystal nanowire clusters of multiferroic material TbMn2O5 were obtained through a simple two-step method.
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Affiliation(s)
- Peikai Zhang
- Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education)
- Department of Physics
- Beihang University
- Beijing 100191, China
| | - Yimin Cui
- Key Laboratory of Micro-nano Measurement-Manipulation and Physics (Ministry of Education)
- Department of Physics
- Beihang University
- Beijing 100191, China
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29
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Koroteev PS, Dobrokhotova ZV, Ilyukhin AB, Efimov NN, Kirdyankin DI, Tyurin AV, Velikodny YA, Kovba ML, Novotortsev VM. Lanthanide cymantrenecarboxylate complexes with an Ln:Mn ratio of 1:2 as precursors for LnMn2O5 phases. Synthesis, structure, physicochemical properties, and thermal decomposition. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.08.024] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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30
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Lovesey SW, Scagnoli V, Garganourakis M, Koohpayeh SM, Detlefs C, Staub U. Melting of chiral order in terbium manganate (TbMnO3) observed with resonant x-ray Bragg diffraction. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:362202. [PMID: 23941726 DOI: 10.1088/0953-8984/25/36/362202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Resonant Bragg diffraction of soft, circularly polarized x-rays has been used to observe directly the temperature dependence of chiral-order melting in a motif of Mn ions in terbium manganate. The underlying mechanism uses the b-axis component of a cycloid, which vanishes outside the polar phase. Melting is witnessed by the first and second harmonics of a cycloid, and we explain why the observed temperature dependence differs in the two harmonics. Conclusions follow from an exact treatment of diffraction by using atomic multipoles in a circular cycloid, since a standard treatment of the diffraction, based on a single material-vector identified with the magnetic dipole, does not reproduce correctly observations at the second harmonic.
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31
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Gupta K, Mahadevan P, Mavropoulos P, Ležaić M. Orbital-ordering-induced ferroelectricity in SrCrO3. PHYSICAL REVIEW LETTERS 2013; 111:077601. [PMID: 23992082 DOI: 10.1103/physrevlett.111.077601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2012] [Revised: 05/07/2013] [Indexed: 06/02/2023]
Abstract
Using density functional theory calculations, ultrathin films of SrVO3(d1) and SrCrO3(d2) on SrTiO3 substrates have been studied as possible multiferroics. Although both are metallic in the bulk limit, they are found to be insulating as a result of orbital ordering driven by lattice distortions at the ultrathin limit. While the distortions in SrVO3 have a first-order Jahn-Teller origin, those in SrCrO3 are ferroelectric in nature. This route to ferroelectricity results in polarizations comparable with conventional ferroelectrics.
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Affiliation(s)
- Kapil Gupta
- S N Bose National Centre for Basic Sciences, Saltlake, Kolkata, India
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Pandey KK, Poswal HK, Kumar R, Sharma SM. High pressure iso-structural phase transition in BiMn2O5. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:325401. [PMID: 23846771 DOI: 10.1088/0953-8984/25/32/325401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The high pressure behavior of multiferroic BiMn2O5 has been investigated using powder x-ray diffraction and Raman scattering techniques as well as density functional theory based first principles calculations. Our investigations show a reversible iso-structural phase transition in BiMn2O5 above 10 GPa. The compressibility along the c axis, i.e. along the edge-shared distorted Mn(4+) octahedral chains, has been found to be significantly reduced above this phase transition, suggesting a dominant role of the relatively rigid Mn-O framework in the high pressure phase rather than that of the coordination sphere around the Bi atom. Bader charge analysis of the charge densities obtained from first principles calculations shows partial atomic charge redistribution among Bi(3+) and Mn(3+) atoms across the phase transition which could be the probable cause of this phase transition.
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Affiliation(s)
- K K Pandey
- High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
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33
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Brown PJ, Chatterji T. Polarization dependence of magnetic Bragg scattering in YMn2O5. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:236004. [PMID: 23685626 DOI: 10.1088/0953-8984/25/23/236004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The polarization dependence of the intensity of elastic magnetic scattering from YMn2O5 single crystals has been measured at 25 K in magnetic fields between 1 and 9 T. A significant polarization dependence was observed in the intensities of magnetic satellite reflections, propagation vector τ = ½, 0, ¼, measured with both the [100] and [010] axes parallel to the common polarization and applied field direction. The intensity asymmetries A observed in sets of orthorhombic equivalent reflections show systematic relationships which allow the phase relationship between different components of their magnetic interaction vectors to be determined. They fix the orientation relationships between the small y and z moments on the Mn(4+) and Mn(3+) sub-lattices and have allowed a further refinement of the magnetic structure, which determines the phases of the vector Fourier components with much higher precision. Systematic differences found between values of A(hkl) and A(h¯k¯l¯) suggest that there is a small modulation of the nuclear structure which has the same wavevector as the magnetic modulation and gives rise to a small nuclear structure factor for the satellite reflections. The magnitudes of the differences suggest shifts in the atomic positions of the order of 0.05 Å.
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Affiliation(s)
- P J Brown
- Institut Laue Langevin, Grenoble, France.
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34
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Retuerto M, Muñoz A, Martínez-Lope MJ, Garcia-Hernandez M, André G, Krezhov K, Alonso JA. Influence of the Bi3+ electron lone pair in the evolution of the crystal and magnetic structure of La(1-x)Bi(x)Mn2O5 oxides. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:216002. [PMID: 23628956 DOI: 10.1088/0953-8984/25/21/216002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
La(1-x)Bi(x)Mn2O5 (x = 0, 0.2, 0.4, 0.6, 0.8 and 1) oxides are members of the RMn2O5 family. The entire series has been prepared in polycrystalline form by a citrate technique. The evolution of their magnetic and crystallographic structures has been investigated by neutron powder diffraction (NPD) and magnetization measurements. All the samples crystallize in an orthorhombic structure with space group Pbam containing infinite chains of Mn(4+)O6 octahedra sharing edges, linked together by Mn(3+)O5 pyramids and (La/Bi)O8 units. These units become strongly distorted as the amount of Bi increases, due to the electron lone pair of Bi(3+). All the members of the series are magnetically ordered below TN = 25-40 K and they present different magnetic structures. For the samples with low Bi content (x = 0.2 and 0.4) the magnetic structure is characterized by the propagation vector k = (0,0,1/2). The magnetic moments of the Mn(4+) ions placed at octahedral sites are ordered according to the basis vectors (Gx, Ay, 0) whereas the Mn(3+) moments, located at pyramidal sites, are ordered according to the basis vectors (0, 0, Cz). When the content of Bi increases, two different propagation vectors are needed to explain the magnetic structure: k1 = (0,0,1/2) and k2 = (1/2,0,1/2). For x = 0.6 and 0.8, k2 is predominant over k1 and for this propagation vector (k2) the magnetic arrangement is defined by the basis vectors (Gx, Ay,0) and (Fx, Cy, 0) for Mn(4+) and Mn(3+) ions, respectively.
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Affiliation(s)
- M Retuerto
- Department of Chemistry, Rutgers State University of New Jersey, Piscataway, NJ 08854-8087, USA.
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Fink J, Schierle E, Weschke E, Geck J. Resonant elastic soft x-ray scattering. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2013; 76:056502. [PMID: 23563216 DOI: 10.1088/0034-4885/76/5/056502] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Resonant (elastic) soft x-ray scattering (RSXS) offers a unique element, site and valence specific probe to study spatial modulations of charge, spin and orbital degrees of freedom in solids on the nanoscopic length scale. It is not only used to investigate single-crystalline materials. This method also enables one to examine electronic ordering phenomena in thin films and to zoom into electronic properties emerging at buried interfaces in artificial heterostructures. During the last 20 years, this technique, which combines x-ray scattering with x-ray absorption spectroscopy, has developed into a powerful probe to study electronic ordering phenomena in complex materials and furthermore delivers important information on the electronic structure of condensed matter. This review provides an introduction to the technique, covers the progress in experimental equipment, and gives a survey on recent RSXS studies of ordering in correlated electron systems and at interfaces.
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Affiliation(s)
- J Fink
- Leibniz-Institute for Solid State and Materials Research Dresden, PO Box 270116, D-01171 Dresden, Germany.
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36
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Mei Y, Wu S. Morphology control of YMn2O5 nanocrystals by hydrothermal synthesis and their magnetic properties. RSC Adv 2013. [DOI: 10.1039/c3ra41671b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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37
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Cao K, Guo GC, He L. Molecular-spin dynamics study of electromagnons in multiferroic RMn2O5. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:206001. [PMID: 22510497 DOI: 10.1088/0953-8984/24/20/206001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We investigate the electromagnon in magnetoferroelectrics RMn(2)O(5) using combined molecular-spin dynamics simulations. We confirm that the origin of the electromagnon modes observed in the optical spectra is due to the exchange-striction interaction between the magnons and the phonons, and the dielectric step at the magnetic phase transition is due to the appearance of the electromagnon in the low-temperature phase in these materials. The magnetic anisotropy breaks the rotational symmetry of the magnetic structures and, as a result, the electromagnon splits into three modes in RMn(2)O(5). We find that the electromagnon frequencies are very sensitive to the magnetic wavevector along the a direction q(x). Therefore, the electromagnon frequencies of TmMn(2)O(5) (q(x) ~ 0.467) are expected to be much higher than those of other materials of the family, such as R= Tb, Y, Ho, etc (q(x) ~ 0.48). We further calculate the electromagnons in the magnetic field, and find a new mode appearing in the magnetic field. Although the modes' frequencies change significantly under magnetic field, the total static dielectric constant contributed from the electromagnons does not change much in the magnetic field, suggesting that the colossal magnetodielectric effects in these materials may not be caused by the electromagnons.
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Affiliation(s)
- Kun Cao
- Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, People's Republic of China
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Kimber SAJ. Charge and orbital order in frustrated Pb3Mn7O15. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:186002. [PMID: 22499064 DOI: 10.1088/0953-8984/24/18/186002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The candidate magnetoelectric Pb(3)Mn(7)O(15) has a structure consisting of one-third filled kagome layers linked by ribbons of edge sharing octahedra in the stacking direction. Previous reports have indicated a complex hexagonal-orthorhombic structural transition upon cooling through ~335 K, although its origins are uncertain. Here both structures are revisited using a combination of neutron and synchrotron x-ray diffraction data. Large shifts of oxygen positions are detected, which show that the interlayer sites and those which occupy voids in the kagome lattice are trivially charge ordered in both phases. The symmetry breaking is found to occur due to Mn(3+) orbital ordering on the ribbon sites and charge ordering of the subset of layer sites which make up a kagome network.
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Affiliation(s)
- Simon A J Kimber
- European Synchrotron Radiation Facility (ESRF), 6 rue Jules Horowitz, BP 220, 38043 Grenoble Cedex 9, France.
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Li F, Nattermann T, Pokrovsky VL. Vortex domain walls in helical magnets. PHYSICAL REVIEW LETTERS 2012; 108:107203. [PMID: 22463449 DOI: 10.1103/physrevlett.108.107203] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2011] [Indexed: 05/31/2023]
Abstract
We show that helical magnets exhibit a nontrivial type of domain wall consisting of a regular array of vortex lines, except for a few distinguished orientations. This result follows from topological consideration and is independent of the microscopic models. We used simple models to calculate the shape and energetics of vortex walls in centrosymmetric and noncentrosymmetric crystals. Vortices are strongly anisotropic, deviating from the conventional Berezinskii-Kosterlitz-Thouless form. The width of the domain walls depend only weakly on the magnetic anisotropy, in contrast to ferromagnets and antiferromagnets. We show that vortex walls can be driven by external currents and in multiferroics also by electric fields.
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Affiliation(s)
- Fuxiang Li
- Department of Physics, Texas A&M University, College Station, Texas 77843-4242, USA
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Li N, Yao K, Gao G, Sun Z, Li L. Charge, orbital and spin ordering in multiferroic BiMn2O5: density functional theory calculations. Phys Chem Chem Phys 2011; 13:9418-24. [DOI: 10.1039/c0cp02252g] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Neng Li
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, PR China.
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41
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Singh K, Kundys B, Poienar M, Simon C. Effect of coupled ferroelectric and antiferromagnetic fluctuations on dielectric anomalies in spin induced multiferroics. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:445901. [PMID: 21403355 DOI: 10.1088/0953-8984/22/44/445901] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Dielectric and magnetodielectric peaks have been evidenced by ε(T, H) measurements in spin induced ferroelectrics: CuCrO(2) and AgCrO(2) delafossites. Such behaviour, also found in several other improper ferroelectrics, can be explained in the frame of Landau analysis of phase transitions with two coupled order parameters: antiferromagnetic ordered moment, L, and polarization, P. The existence of such anomalies in the dielectric constant observed at T(N) is very general. The existence of this peak is not due to any linear coupling term between P and L in this system, but rather due to the L(2)P(2) term which always exists in every compound, whatever the symmetry/space group is.
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Affiliation(s)
- Kiran Singh
- Laboratoire CRISMAT, CNRS UMR 6508, ENSICAEN, Caen, France.
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42
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Chen JM, Lee JM, Chou TL, Chen SA, Huang SW, Jeng HT, Lu KT, Chen TH, Liang YC, Chen SW, Chuang WT, Sheu HS, Hiraoka N, Ishii H, Tsuei KD, Huang E, Lin CM, Yang TJ. Pressure-dependent electronic structures in multiferroic DyMnO3: A combined lifetime-broadening-suppressed x-ray absorption spectroscopy andab initioelectronic structure study. J Chem Phys 2010; 133:154510. [DOI: 10.1063/1.3490400] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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43
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Beale TAW, Wilkins SB, Johnson RD, Bland SR, Joly Y, Forrest TR, McMorrow DF, Yakhou F, Prabhakaran D, Boothroyd AT, Hatton PD. Antiferromagnetically spin polarized oxygen observed in magnetoelectric TbMn2O5. PHYSICAL REVIEW LETTERS 2010; 105:087203. [PMID: 20868129 DOI: 10.1103/physrevlett.105.087203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2010] [Indexed: 05/29/2023]
Abstract
We report the direct measurement of antiferromagnetic spin polarization at the oxygen sites in the multiferroic TbMn2O5, through resonant soft x-ray magnetic scattering. This supports recent theoretical models suggesting that the oxygen spin polarization is key to the magnetoelectric coupling mechanism. The spin polarization is observed through a resonantly enhanced diffraction signal at the oxygen K edge at the commensurate antiferromagnetic wave vector. Using the fdmnes code we have accurately reproduced the experimental data. We have established that the resonance arises through the spin polarization on the oxygen sites hybridized with the square based pyramid Mn3+ ions. Furthermore we have discovered that the position of the Mn3+ ion directly influences the oxygen spin polarization.
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Affiliation(s)
- T A W Beale
- Department of Physics, University of Durham, Rochester Building, South Road, Durham DH1 3LE, United Kingdom
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Wang CW, Wu CM, Li CY, Karna SK, Hsu CK, Li CHC, Li WH, Yu CC, Wu CP, Chou H, Lynn JW. Short range magnetic correlations induced by La substitution in Ho(1-x)La(x)Mn(2)O(5). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:246002. [PMID: 21393793 DOI: 10.1088/0953-8984/22/24/246002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Magnetic susceptibility, x-ray diffraction, neutron diffraction and Raman scattering measurements are employed to study the effects of La substitution on the magnetic properties of multiferroic HoMn(2)O(5). 9% and 18% La-substituted compounds crystallize into the same orthorhombic Pbam symmetry as the parent compound. The magnetic responses to an ac driving magnetic field between 40 and 140 K are greatly enhanced by 18% La substitution. The neutron magnetic diffraction patterns reveal the development of short range magnetic correlations below 140 K. In addition, two Raman peaks and a series of new x-ray diffraction peaks suddenly develop below this temperature. Incommensurate long range antiferromagnetic order appears below 38 K. Magnetic frustration could be the main mechanism governing the present observations.
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Affiliation(s)
- Chin-Wei Wang
- Department of Physics and Center for Neutron Beam Applications, National Central University, Jhongli, 32001, Taiwan
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Tiwari S, Sa D. A phenomenological Landau theory for electromagnons in cubic spinel multiferroic CoCr₂O₄. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:225903. [PMID: 21393750 DOI: 10.1088/0953-8984/22/22/225903] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Non-anisotropic free energy is considered which under minimization yields two magnetic phases: a conical spin density wave and a low temperature conical cycloid. Using equations of motion, the excitation spectrum is studied. Knowing the nature of these excitations, the dielectric function as well as the fluctuation specific heat is computed and compared with the experimental spectrum. Due to the electromagnon going soft, the dielectric function (imaginary part) as well as the specific heat capacity show peaks at the temperature where ferroelectricity appears in the system.
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46
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Zhang ZY, Chen L. Polarization in a Rashba strip coupled with a spiral spin density wave. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:215302. [PMID: 21393720 DOI: 10.1088/0953-8984/22/21/215302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The magnetoelectric effect in a Rashba strip is studied, which is coupled to a spiral spin density wave (SDW). The polarization, if it can be induced, must be perpendicular to the plane constructed by the helix axis and the wavevector of the SDW. With a gate voltage on the strip varied, the polarization fluctuates quickly and can be switched from a positive to a negative value or vice versa. Furthermore, reversing either the helix axis or the wavevector leads to the reversal of polarization. The main contributions to the polarization come from the eigenstates in the vicinity of the von Hove singularities. At half-filling, contributions from different eigenstates offset each other exactly. With the Rashba spin-orbit coupling increased, the averaged polarization displays an oscillatory behavior due to the spin precession, whereas with the exchange coupling increased, the averaged polarization increases first then decreases. Considering the size effect on the polarization, the spin precession length is an important characteristic length.
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Affiliation(s)
- Zhi-Yong Zhang
- Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China.
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47
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Chun SH, Chai YS, Oh YS, Jaiswal-Nagar D, Haam SY, Kim I, Lee B, Nam DH, Ko KT, Park JH, Chung JH, Kim KH. Realization of giant magnetoelectricity in helimagnets. PHYSICAL REVIEW LETTERS 2010; 104:037204. [PMID: 20366679 DOI: 10.1103/physrevlett.104.037204] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2009] [Indexed: 05/29/2023]
Abstract
We show that low field magnetoelectric (ME) properties of helimagnets Ba0.5Sr1.5Zn2(Fe1-xAlx)12O22 can be efficiently tailored by the Al-substitution level. As x increases, the critical magnetic field for switching electric polarization is systematically reduced from approximately 1 T down to approximately 1 mT, and the ME susceptibility is greatly enhanced to reach a giant value of 2.0x10{4} ps/m at an optimum x=0.08. We find that control of the nontrivial orbital moment in the octahedral Fe sites through the Al substitution is crucial for fine-tuning the magnetic anisotropy and obtaining the conspicuously improved ME characteristics.
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Affiliation(s)
- Sae Hwan Chun
- FPRD, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, South Korea
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Cao K, Guo GC, Vanderbilt D, He L. First-principles modeling of multiferroic RMn2O5. PHYSICAL REVIEW LETTERS 2009; 103:257201. [PMID: 20366278 DOI: 10.1103/physrevlett.103.257201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2009] [Indexed: 05/29/2023]
Abstract
We investigate the phase diagrams of RMn(2)O(5) via a first-principles effective-Hamiltonian method. We are able to reproduce the most important features of the complicated magnetic and ferroelectric phase transitions. The calculated polarization as a function of temperature agrees very well with experiments. The dielectric-constant step at the commensurate-to-incommensurate magnetic phase transition is well reproduced. The microscopic mechanisms for the phase transitions are discussed.
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Affiliation(s)
- Kun Cao
- Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, 230026, People's Republic of China
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49
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Ma C, Yan JQ, Dennis K, McCallum R, Tan X. Synthesis, thermal stability and magnetic properties of the Lu1−xLaxMn2O5 solid solution. J SOLID STATE CHEM 2009. [DOI: 10.1016/j.jssc.2009.08.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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50
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Pregelj M, Zaharko O, Zorko A, Kutnjak Z, Jeglic P, Brown PJ, Jagodic M, Jaglicić Z, Berger H, Arcon D. Spin amplitude modulation driven magnetoelectric coupling in the new multiferroic FeTe2O5Br. PHYSICAL REVIEW LETTERS 2009; 103:147202. [PMID: 19905598 DOI: 10.1103/physrevlett.103.147202] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2009] [Indexed: 05/28/2023]
Abstract
The magnetic and ferroelectric properties of the layered geometrically frustrated cluster compound FeTe2O5Br were investigated with single-crystal neutron diffraction and dielectric measurements. An incommensurate transverse amplitude modulated magnetic order with the wave vector q=(1/2,0.463,0) develops below T(N)=10.6(2) K. Simultaneously, a ferroelectric order due to exchange striction involving polarizable Te4+ lone-pair electrons develops perpendicular to q and to Fe3+ magnetic moments. The observed magnetoelectric coupling is proposed to originate from the temperature dependent phase difference between neighboring amplitude modulation waves.
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Affiliation(s)
- M Pregelj
- Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
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