1
|
Tiwari P, Kumar S, Rath C. Probing structural transformation and optical and magnetic properties in Cr doped GdMnO 3: Jahn-Teller distortion, photoluminescence and magnetic switching effect. RSC Adv 2019; 9:39871-39882. [PMID: 35541423 PMCID: PMC9076280 DOI: 10.1039/c9ra08562a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2019] [Accepted: 11/20/2019] [Indexed: 11/21/2022] Open
Abstract
The systematic evolution of structure, photoluminescence and different magnetic transitions in GdMnO3 is reported after Cr doping. With increasing the Cr concentration from 10 to 40 at%, Rietveld refinement of X-ray diffraction patterns demonstrates that an O' type orthorhombic structure transforms to O type, manifesting a reduction in lattice volume. The noticeable reduction in lattice volume is ascribed to the smaller size of the Cr3+ ion compared to Mn3+. The structural transformation is accompanied with a considerable decrease in the Jahn-Teller distortion factor evaluated from XRD, Raman and photoluminescence measurements. Magnetic studies reveal a considerable enhancement in Néel temperature (T N) from ∼42 K for x = 0 to 130 K for x = 0.4. Interestingly, we observe magnetization reversal (MR) with spin reorientation (TSR) for x = 0.3. The mechanism for such a magnetic behavior is discussed on the basis of competition between Mn, Cr and Gd. The incorporation of Cr not only constructively modifies the crystal structure and evokes the magnetic reversal phenomenon but also contributes towards the enhanced emission spectra. The promising structure and magnetic properties of Cr doped GdMnO3 offer potential pathways for spintronics and magnetic switching devices.
Collapse
Affiliation(s)
- Priyanka Tiwari
- School of Materials Science and Technology, Indian Institute of Technology (Banaras Hindu University) Varanasi 221005 India
| | - Sandeep Kumar
- School of Materials Science and Technology, Indian Institute of Technology (Banaras Hindu University) Varanasi 221005 India
| | - Chandana Rath
- School of Materials Science and Technology, Indian Institute of Technology (Banaras Hindu University) Varanasi 221005 India
| |
Collapse
|
2
|
Yadagiri K, Nithya R, Sharma S, Satya AT. Modification of low temperature magnetic interactions in Dy 1-x Eu x MnO 3. RSC Adv 2018; 8:13537-13545. [PMID: 35542557 PMCID: PMC9079790 DOI: 10.1039/c8ra00224j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Accepted: 03/27/2018] [Indexed: 11/21/2022] Open
Abstract
Solid solutions of rare earth ion (Eu3+) substituted DyMnO3, Dy1-x Eu x MnO3 (x = 0.0-1.0) have been synthesized by ceramic method. Powder X-ray diffraction revealed single phase nature of the compounds with orthorhombic structure. Contributions from the atomic vibrations to the observation of Raman bands have been established and assigned to symmetry stretching and anti symmetry stretching, bending and tilting modes. Raman band frequencies of tilting, asymmetric stretching and bending modes were found to decrease with increasing europium concentration showing softening. Transport studies revealed that all the compounds show semiconducting nature. While the end compounds display hopping process for electrical conduction, all the substituted compounds showed activated type of conduction, and activated energy was found to reduce with increase in x. Molar susceptibility of the substituted compounds for x = 0.1, 0.3 and 0.5 revealed an antiferromagnetic transition corresponding to Mn ions. The fitted Curie-Weiss temperatures also suggested the existence of antiferromagnetic interactions in all the materials. The magnetic field dependent magnetization at various temperatures revealed paramagnetic nature down to 8 K below which hysteresis loops are observed. The presence of strong ferromagnetic correlations between Dy and Mn spins through apical oxygen ions results in the large coercive fields. For temperatures above the antiferromagnetic temperature of manganese ions (39 K) M-H curves show almost straight lines implying the absence of ferromagnetic interactions in the compounds. Different magnetic transitions: from high temperature paramagnetic state to intermediate temperature antiferromagnetic state to low temperature ferromagnetic states are observed in the M-H data.
Collapse
Affiliation(s)
- K Yadagiri
- Materials Science Group, Indira Gandhi Centre for Atomic Research, HBNI Kalpakkam - 603102 India
| | - R Nithya
- Materials Science Group, Indira Gandhi Centre for Atomic Research, HBNI Kalpakkam - 603102 India
| | - Shilpam Sharma
- Materials Science Group, Indira Gandhi Centre for Atomic Research, HBNI Kalpakkam - 603102 India
| | - A T Satya
- Materials Science Group, Indira Gandhi Centre for Atomic Research, HBNI Kalpakkam - 603102 India
| |
Collapse
|
3
|
Review of the Magnetocaloric Effect in RMnO3 and RMn2O5 Multiferroic Crystals. CRYSTALS 2017. [DOI: 10.3390/cryst7020044] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
4
|
Sim H, Oh J, Jeong J, Le MD, Park JG. Hexagonal RMnO3: a model system for two-dimensional triangular lattice antiferromagnets. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2016; 72:3-19. [PMID: 26830792 DOI: 10.1107/s2052520615022106] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Accepted: 11/19/2015] [Indexed: 06/05/2023]
Abstract
The hexagonal RMnO3(h-RMnO3) are multiferroic materials, which exhibit the coexistence of a magnetic order and ferroelectricity. Their distinction is in their geometry that both results in an unusual mechanism to break inversion symmetry and also produces a two-dimensional triangular lattice of Mn spins, which is subject to geometrical magnetic frustration due to the antiferromagnetic interactions between nearest-neighbor Mn ions. This unique combination makes the h-RMnO3 a model system to test ideas of spin-lattice coupling, particularly when both the improper ferroelectricity and the Mn trimerization that appears to determine the symmetry of the magnetic structure arise from the same structure distortion. In this review we demonstrate how the use of both neutron and X-ray diffraction and inelastic neutron scattering techniques have been essential to paint this comprehensive and coherent picture of h-RMnO3.
Collapse
Affiliation(s)
- Hasung Sim
- Center for Correlated Electron Systems, Institute for Basic Science (IBS) and Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - Joosung Oh
- Center for Correlated Electron Systems, Institute for Basic Science (IBS) and Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - Jaehong Jeong
- Center for Correlated Electron Systems, Institute for Basic Science (IBS) and Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - Manh Duc Le
- Center for Correlated Electron Systems, Institute for Basic Science (IBS) and Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - Je Geun Park
- Center for Correlated Electron Systems, Institute for Basic Science (IBS) and Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| |
Collapse
|
5
|
Study of spin-ordering and spin-reorientation transitions in hexagonal manganites through Raman spectroscopy. Sci Rep 2015; 5:13366. [PMID: 26300075 PMCID: PMC4547132 DOI: 10.1038/srep13366] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 07/09/2015] [Indexed: 01/16/2023] Open
Abstract
Spin-wave (magnon) scattering, when clearly observed by Raman spectroscopy, can be simple and powerful for studying magnetic phase transitions. In this paper, we present how to observe magnon scattering clearly by Raman spectroscopy, then apply the Raman method to study spin-ordering and spin-reorientation transitions of hexagonal manganite single crystal and thin films and compare directly with the results of magnetization measurements. Our results show that by choosing strong resonance condition and appropriate polarization configuration, magnon scattering can be clearly observed, and the temperature dependence of magnon scattering can be simple and powerful quantity for investigating spin-ordering as well as spin-reorientation transitions. Especially, the Raman method would be very helpful for investigating the weak spin-reorientation transitions by selectively probing the magnons in the Mn3+ sublattices, while leaving out the strong effects of paramagnetic moments of the rare earth ions.
Collapse
|
6
|
Yu T, Tyson TA, Chen HY, Abeykoon AMM, Chen YS, Ahn KH. Absence of significant structural changes near the magnetic ordering temperature in small-ion rare earth perovskite RMnO3. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:495402. [PMID: 25396338 DOI: 10.1088/0953-8984/26/49/495402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Detailed structural measurements on multiple length scales were conducted on a new perovskite phase of ScMnO3, and on orthorhombic LuMnO3 as a benchmark. Complementary density functional theory (DFT) calculations were carried out, and predict that ScMnO3 possesses E-phase magnetic order at low temperature with displacements of the Mn sites (relative to the high temperature state) of ∼0.07 Å, compared to ∼0.04 Å predicted for LuMnO3. However, detailed local, intermediate and long-range structural measurements by x-ray pair distribution function analysis, single crystal x-ray diffraction and x-ray absorption spectroscopy, find no local or long-range distortions on crossing into the low temperature E-phase of the magnetically ordered state. The measurements place upper limits on any structural changes to be at most one order of magnitude lower than DFT predictions and suggest that this theoretical approach does not properly account for the spin-lattice coupling in these oxides and may possibly predict the incorrect magnetic order at low temperatures. The results suggest that the electronic contribution to the electrical polarization dominates and should be more accurately treated in theoretical models.
Collapse
Affiliation(s)
- T Yu
- Department of Physics, New Jersey Institute of Technology, Newark, NJ 07102, USA
| | | | | | | | | | | |
Collapse
|
7
|
Lu C, Dong S, Xia Z, Luo H, Yan Z, Wang H, Tian Z, Yuan S, Wu T, Liu J. Polarization enhancement and ferroelectric switching enabled by interacting magnetic structures in DyMnO₃ thin films. Sci Rep 2013; 3:3374. [PMID: 24291803 PMCID: PMC3844969 DOI: 10.1038/srep03374] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Accepted: 11/13/2013] [Indexed: 11/10/2022] Open
Abstract
The mutual controls of ferroelectricity and magnetism are stepping towards practical applications proposed for quite a few promising devices in which multiferroic thin films are involved. Although ferroelectricity stemming from specific spiral spin ordering has been reported in highly distorted bulk perovskite manganites, the existence of magnetically induced ferroelectricity in the corresponding thin films remains an unresolved issue, which unfortunately halts this step. In this work, we report magnetically induced electric polarization and its remarkable response to magnetic field (an enhancement of ~800% upon a field of 2 Tesla at 2 K) in DyMnO₃ thin films grown on Nb-SrTiO₃ substrates. Accompanying with the large polarization enhancement, the ferroelectric coercivity corresponding to the magnetic chirality switching field is significantly increased. A picture based on coupled multicomponent magnetic structures is proposed to understand these features. Moreover, different magnetic anisotropy related to strain-suppressed GdFeO₃-type distortion and Jahn-Teller effect is identified in the films.
Collapse
Affiliation(s)
- Chengliang Lu
- School of Physics & Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China
| | | | | | | | | | | | | | | | | | | |
Collapse
|
8
|
Mansouri S, Jandl S, Laverdière J, Fournier P, Mukhin AA, Ivanov VY, Balbashov AM. Magnetic and micro-Raman studies of hexagonal-DyMnO3. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:066003. [PMID: 23306085 DOI: 10.1088/0953-8984/25/6/066003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Dc-susceptibility measurements and Raman active phonon frequencies of hexagonal DyMnO(3) retrace the Mn(3+) ions antiferromagnetic transition at T(N) ~ 70 K and their spin reorientation at T(SR) ~ 48 K. The temperature evolution of Raman active mode frequencies and their over-hardening are associated with Dy(3+) and Mn(3+) ion displacements below T(N) and with a spin-phonon coupling that involves apical oxygen.
Collapse
Affiliation(s)
- S Mansouri
- Département de Physique, Université de Sherbrooke, Sherbrooke, Canada.
| | | | | | | | | | | | | |
Collapse
|
9
|
Hexagonal Manganites—(RMnO3): Class (I) Multiferroics with Strong Coupling of Magnetism and Ferroelectricity. ACTA ACUST UNITED AC 2013. [DOI: 10.1155/2013/497073] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Hexagonal manganites belong to an exciting class of materials exhibiting strong interactions between a highly frustrated magnetic system, the ferroelectric polarization, and the lattice. The existence and mutual interaction of different magnetic ions (Mn and rare earth) results in complex magnetic phase diagrams and novel physical phenomena. A summary and discussion of the various properties, underlying physical mechanisms, the role of the rare earth ions, and the complex interactions in multiferroic hexagonal manganites, are presented in this paper.
Collapse
|
10
|
Remsen S, Dabrowski B, Chmaissem O, Mais J, Szewczyk A. Synthesis and oxygen content dependent properties of hexagonal DyMnO3+δ. J SOLID STATE CHEM 2011. [DOI: 10.1016/j.jssc.2011.06.037] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|