1
|
Wu H, Liu Q, Gao R, Mi S, Jia L, Wang J, Liu H, Zhang S, Wei J, Wang X, Han G, Wang J. Acoustic Wave-Induced FeRh Magnetic Phase Transition and Its Application in Antiferromagnetic Pattern Writing and Erasing. ACS Nano 2024. [PMID: 38687780 DOI: 10.1021/acsnano.3c11619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
We explore the FeRh magnetic phase transition (MPT) and magnetic phase domain (MPD) with the introduction of surface acoustic waves (SAWs). The effects of the SAW pulses with different pulse widths and powers on resistance-temperature loops are investigated, revealing that the SAW can reduce the thermal hysteresis. Meanwhile, the SAW-induced comb-like antiferromagnetic (AFM) phase domains are observed. By changing the pulse width and SAW frequency, we further realize a writing-erasing process of the different comb-like AFM phase domains in the mixed-phase regime of the cooling transition branch. Resistance measurements also display the repeated SAW writing-erasing and the nonvolatile characteristic clearly. MPT paths are measured to demonstrate that short SAW pulses induce isothermal MPT and write magnetic phase patterns via the dynamic strain, whereas long SAW pulses erase patterns via the acoustothermal effect. The Preisach model is introduced to model the FeRh MPT under the SAW pulses, and the calculated results correspond well with our experiments, which reveals the SAW-induced energy modulation promotes FeRh MPT. COMSOL simulations of the SAW strain field also support our results. Our study not only can be used to reduce the thermal hysteresis but also extends the application of the SAW as a tool to write and erase AFM patterns for spintronics and magnonics.
Collapse
Affiliation(s)
- Huiliang Wu
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Qingfang Liu
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Runliang Gao
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Shuai Mi
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Lei Jia
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Jianing Wang
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Huibo Liu
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Senfu Zhang
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Jinwu Wei
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, People's Republic of China
| | - Xiangqian Wang
- Key Laboratory of Sensor and Sensor Technology, Institute of Sensor Technology, Gansu Academy of Science, Lanzhou 730000, People's Republic of China
| | - Genliang Han
- Key Laboratory of Sensor and Sensor Technology, Institute of Sensor Technology, Gansu Academy of Science, Lanzhou 730000, People's Republic of China
| | - Jianbo Wang
- School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, People's Republic of China
- Key Laboratory for Special Function Materials and Structural Design of the Ministry of Education, Lanzhou University, Lanzhou 730000, People's Republic of China
| |
Collapse
|
2
|
Xun W, Wu C, Sun H, Zhang W, Wu YZ, Li P. Coexisting Magnetism, Ferroelectric, and Ferrovalley Multiferroic in Stacking-Dependent Two-Dimensional Materials. Nano Lett 2024; 24:3541-3547. [PMID: 38451854 DOI: 10.1021/acs.nanolett.4c00597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/09/2024]
Abstract
Two-dimensional (2D) multiferroic materials have widespread application prospects in facilitating the integration and miniaturization of nanodevices. However, the magnetic, ferroelectric, and ferrovalley properties in one 2D material are rarely coupled. Here, we propose a mechanism for manipulating magnetism, ferroelectric, and valley polarization by interlayer sliding in a 2D bilayer material. Monolayer GdI2 is a ferromagnetic semiconductor with a valley polarization of up to 155.5 meV. More interestingly, the magnetism and valley polarization of bilayer GdI2 can be strongly coupled by sliding ferroelectricity, making these tunable and reversible. In addition, we uncover the microscopic mechanism of the magnetic phase transition by a spin Hamiltonian and electron hopping between layers. Our findings offer a new direction for investigating 2D multiferroic devices with implications for next-generation electronic, valleytronic, and spintronic devices.
Collapse
Affiliation(s)
- Wei Xun
- State Key Laboratory for Mechanical Behavior of Materials, Center for Spintronics and Quantum System, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China
- Faculty of Electronic Information Engineering, Huaiyin Institute of Technology, Huaian 223003, People's Republic of China
| | - Chao Wu
- State Key Laboratory for Mechanical Behavior of Materials, Center for Spintronics and Quantum System, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China
| | - Hanbo Sun
- State Key Laboratory for Mechanical Behavior of Materials, Center for Spintronics and Quantum System, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China
| | - Weixi Zhang
- Department of Physics and Electronic Engineering, Tongren University, Tongren 554300, People's Republic of China
| | - Yin-Zhong Wu
- School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou 215009, People's Republic of China
| | - Ping Li
- State Key Laboratory for Mechanical Behavior of Materials, Center for Spintronics and Quantum System, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China
- State Key Laboratory for Surface Physics and Department of Physics, Fudan University, Shanghai, 200433, China
| |
Collapse
|
3
|
Xie K, Zhang XW, Xiao D, Cao T. Engineering Magnetic Phases of Layered Antiferromagnets by Interfacial Charge Transfer. ACS Nano 2023; 17:22684-22690. [PMID: 37961983 DOI: 10.1021/acsnano.3c07125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Van der Waals heterostructures composed of distinct layered materials can display behaviors entirely different from those of each individual layer due to interfacial coupling. Here we investigate the manipulation of magnetic phases in two-dimensional magnets through interfacial charge transfer in heterostructures of magnetic and nonmagnetic layers. This is demonstrated by first-principles calculations, which unveil a transition toward the ferromagnetic phase by stacking antiferromagnetic bilayer CrSBr on graphene. Using an effective model consisting of two electronically coupled single layers, we show that the antiferromagnetic to ferromagnetic magnetic phase transition occurs due to interfacial charge transfer, which enhances ferromagnetism. We further reveal that the magnetic phase transition can also be induced by electron and hole carriers and demonstrate that the phase transition is a spin-canting process. This allows for precise gate-control of noncollinear magnetism on demand. Our work predicts interfacial charge transfer as a potent mechanism to tune magnetic phases in van der Waals heterostructures and creates opportunities for spintronic applications.
Collapse
Affiliation(s)
- Kaichen Xie
- Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, United States
| | - Xiao-Wei Zhang
- Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, United States
| | - Di Xiao
- Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, United States
- Department of Physics, University of Washington, Seattle, Washington 98195, United States
| | - Ting Cao
- Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, United States
| |
Collapse
|
4
|
Pawbake A, Pelini T, Mohelsky I, Jana D, Breslavetz I, Cho CW, Orlita M, Potemski M, Measson MA, Wilson NP, Mosina K, Soll A, Sofer Z, Piot BA, Zhitomirsky ME, Faugeras C. Magneto-Optical Sensing of the Pressure Driven Magnetic Ground States in Bulk CrSBr. Nano Lett 2023; 23:9587-9593. [PMID: 37823538 DOI: 10.1021/acs.nanolett.3c03216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/13/2023]
Abstract
Competition between exchange interactions and magnetocrystalline anisotropy may bring new magnetic states that are of great current interest. An applied hydrostatic pressure can further be used to tune their balance. In this work, we investigate the magnetization process of a biaxial antiferromagnet in an external magnetic field applied along the easy axis. We find that the single metamagnetic transition of the Ising type observed in this material under ambient pressure transforms under hydrostatic pressure into two transitions, a first-order spin-flop transition followed by a second-order transition toward a polarized ferromagnetic state near saturation. This reversible tuning into a new magnetic phase is obtained in layered bulk CrSBr at low temperature by varying the interlayer distance using high hydrostatic pressure, which efficiently acts on the interlayer magnetic exchange and is probed by magneto-optical spectroscopy.
Collapse
Affiliation(s)
- Amit Pawbake
- LNCMI, UPR 3228, CNRS, EMFL, Université Grenoble Alpes, 38000 Grenoble, France
| | - Thomas Pelini
- LNCMI, UPR 3228, CNRS, EMFL, Université Grenoble Alpes, 38000 Grenoble, France
| | - Ivan Mohelsky
- LNCMI, UPR 3228, CNRS, EMFL, Université Grenoble Alpes, 38000 Grenoble, France
| | - Dipankar Jana
- LNCMI, UPR 3228, CNRS, EMFL, Université Grenoble Alpes, 38000 Grenoble, France
| | - Ivan Breslavetz
- LNCMI, UPR 3228, CNRS, EMFL, Université Grenoble Alpes, 38000 Grenoble, France
| | - Chang-Woo Cho
- LNCMI, UPR 3228, CNRS, EMFL, Université Grenoble Alpes, 38000 Grenoble, France
| | - Milan Orlita
- LNCMI, UPR 3228, CNRS, EMFL, Université Grenoble Alpes, 38000 Grenoble, France
| | - Marek Potemski
- LNCMI, UPR 3228, CNRS, EMFL, Université Grenoble Alpes, 38000 Grenoble, France
- CENTERA Laboratories, Institute of High Pressure Physics, PAS, 01-142 Warsaw, Poland
| | | | - Nathan P Wilson
- Walter Schottky Institut, Physics Department and MCQST, Technische Universitat Munchen, 85748 Garching, Germany
| | - Kseniia Mosina
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technicka 5, 166 28 Prague 6, Czech Republic
| | - Aljoscha Soll
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technicka 5, 166 28 Prague 6, Czech Republic
| | - Zdenek Sofer
- Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technicka 5, 166 28 Prague 6, Czech Republic
| | - Benjamin A Piot
- LNCMI, UPR 3228, CNRS, EMFL, Université Grenoble Alpes, 38000 Grenoble, France
| | - Mike E Zhitomirsky
- Université Grenoble Alpes, CEA, Grenoble INP, IRIG, Pheliqs, 38000 Grenoble, France
- Institut Laue-Langevin, F-38042 Grenoble Cedex 9, France
| | - Clement Faugeras
- LNCMI, UPR 3228, CNRS, EMFL, Université Grenoble Alpes, 38000 Grenoble, France
| |
Collapse
|
5
|
Chakraborty T, Elizabeth S. Unusual critical behavior of Griffiths ferromagnet Ho 2NiMnO 6at magnetic phase transition. J Phys Condens Matter 2023; 35:505803. [PMID: 37683676 DOI: 10.1088/1361-648x/acf827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Accepted: 09/08/2023] [Indexed: 09/10/2023]
Abstract
The critical behavior at the ferromagnetic to paramagnetic phase transition of a Griffiths ferromagnet, Ho2NiMnO6, is studied using modified Arrott plot, Kouvel-Fisher, and critical isotherm analysis. Here, we report a second-order phase transition and conclude from the estimated critical exponents that it is unusual and do not belong to conventional universality classes. However, they obey scaling relationships, which indicates the renormalization of interactions around the phase transition temperature. The presence of Griffiths phase in the system accounts for the unusual critical exponents observed.
Collapse
Affiliation(s)
- Tirthankar Chakraborty
- School of Physics and Materials Science, Thapar Institute of Engineering and Technology, Punjab 147001, India
| | - Suja Elizabeth
- Department of Physics, Indian Institute of Science, Bangalore 560012, India
| |
Collapse
|
6
|
Zhang Y, Zhang J, Yang W, Zhang H, Jia J. Bi 2Te 3-intercalated MnBi 2Te 4: ideal candidate to explore intrinsic Chern insulator and high-temperature quantum anomalous Hall effect. J Phys Condens Matter 2023; 35. [PMID: 37666254 DOI: 10.1088/1361-648x/acf6a0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Accepted: 09/04/2023] [Indexed: 09/06/2023]
Abstract
The recently discovered magnetic topological insulator of MnBi2Te4(MBT), has been demonstrated to realize the quantum anomalous Hall (QAH) effect, while the naturally antiferromagnetic (AFM) interlayer coupling in MBT results in that the QAH effect can only be realized in odd-layered systems and at low temperature. Using first-principles calculations, we find that intercalating Bi2Te3(BT) layers into MBT by forming MBT/(BT)n/MBT (n= 1-6) heterostructures can induce magnetic phase transition from AFM to ferromagnetic (FM) interlayer coupling whenn⩾ 3. Specifically, MBT/(BT)3/MBT and MBT/(BT)4/MBT respectively host Curie temperaturesTcof 14 K and 11 K, which fits well the experimentally measuredTcof 12 K. Detailed band structure calculations and topological identification show that the QAH phases are well preserved for all FM heterostructures. And the topological mechanism of MBT/(BT)n/MBT as a function ofnis revealed by employing continuum model analysis. Most importantly, the FM MBT/(BT)4/MBT has already been experimentally fabricated. Thus, our work provides a practical guideline to explore high-temperature QAH effect in MBT family of materials.
Collapse
Affiliation(s)
- Yaling Zhang
- College of Chemistry and Materials Science, Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, Shanxi Normal University, Taiyuan 030006, People's Republic of China
| | - Jingjing Zhang
- College of Physics and Electronic Information, Shanxi Normal University, Taiyuan 030006, People's Republic of China
| | - Wenjia Yang
- College of Chemistry and Materials Science, Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, Shanxi Normal University, Taiyuan 030006, People's Republic of China
| | - Huisheng Zhang
- College of Chemistry and Materials Science, Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, Shanxi Normal University, Taiyuan 030006, People's Republic of China
- College of Physics and Electronic Information, Shanxi Normal University, Taiyuan 030006, People's Republic of China
| | - Jianfeng Jia
- College of Chemistry and Materials Science, Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, Shanxi Normal University, Taiyuan 030006, People's Republic of China
| |
Collapse
|
7
|
Xiong J, Peng YH, Lin JY, Cen YJ, Yang XB, Zhao YJ. High Concentration Intrinsic Defects in MnSb 2Te 4. Materials (Basel) 2023; 16:5496. [PMID: 37570198 PMCID: PMC10420118 DOI: 10.3390/ma16155496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 07/20/2023] [Accepted: 08/03/2023] [Indexed: 08/13/2023]
Abstract
MnSb2Te4 has a similar structure to an emerging material, MnBi2Te4. According to earlier theoretical studies, the formation energy of Mn antisite defects in MnSb2Te4 is negative, suggesting its inherent instability. This is clearly in contrast to the successful synthesis of experimental samples of MnSb2Te4. Here, the growth environment of MnSb2Te4 and the intrinsic defects are correspondingly investigated. We find that the Mn antisite defect is the most stable defect in the system, and a Mn-rich growth environment favors its formation. The thermodynamic equilibrium concentrations of the Mn antisite defects could be as high as 15% under Mn-poor conditions and 31% under Mn-rich conditions. It is also found that Mn antisite defects prefer a uniform distribution. In addition, the Mn antisite defects can modulate the interlayer magnetic coupling in MnSb2Te4, leading to a transition from the ideal antiferromagnetic ground state to a ferromagnetic state. The ferromagnetic coupling effect can be further enhanced by controlling the defect concentration.
Collapse
Affiliation(s)
| | | | | | | | | | - Yu-Jun Zhao
- Department of Physics, South China University of Technology, Guangzhou 510640, China; (J.X.); (Y.-H.P.); (J.-Y.L.); (Y.-J.C.); (X.-B.Y.)
| |
Collapse
|
8
|
Ouyang W, Shi B, Su T, Cheng X, Gao H, Jia F, Whangbo MH, Ren W. Magnetic transitions of hydrogenated H xCrO 2( x= 0-2) monolayer from a ferromagnetic half-metal to antiferromagnetic insulator. J Phys Condens Matter 2023; 35:305001. [PMID: 37054736 DOI: 10.1088/1361-648x/acccc6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 04/13/2023] [Indexed: 06/19/2023]
Abstract
Two-dimensional (2D) transition metal oxide monolayers are currently attracting great interest in materials research due to their versatility and tunable electronic and magnetic properties. In this study, we report the prediction of magnetic phase changes in HxCrO2(0 ⩽x⩽ 2) monolayer on the basis of first-principles calculations. As the H adsorption concentrationxincreases from 0 to 0.75, HxCrO2monolayer transforms from a ferromagnetic (FM) half-metal to a small-gap FM insulator. Whenx= 1.00 and 1.25, it behaves as a bipolar antiferromagnetic (AFM) insulator, and eventually becomes an AFM insulator asxincreases further up to 2.00. The results suggest that the magnetic properties of CrO2monolayer can be effectively controlled by hydrogenation, and that HxCrO2monolayers have the potential for realizing tunable 2D magnetic materials. Our results provide a comprehensive understanding of the hydrogenated 2D transition metal CrO2and provide a research method that can be used as a reference for the hydrogenation of other similar 2D materials.
Collapse
Affiliation(s)
- Wenbin Ouyang
- Physics Department, International Center for Quantum and Molecular Structures, Materials Genome Institute, State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of High Temperature Superconductors, Shanghai University, Shanghai 200444, People's Republic of China
| | - Bowen Shi
- Physics Department, International Center for Quantum and Molecular Structures, Materials Genome Institute, State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of High Temperature Superconductors, Shanghai University, Shanghai 200444, People's Republic of China
- Shanghai World Foreign Language Academy, 400 Baihua Street, Shanghai 200233, People's Republic of China
| | - Tianhao Su
- Physics Department, International Center for Quantum and Molecular Structures, Materials Genome Institute, State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of High Temperature Superconductors, Shanghai University, Shanghai 200444, People's Republic of China
| | - Xuli Cheng
- Physics Department, International Center for Quantum and Molecular Structures, Materials Genome Institute, State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of High Temperature Superconductors, Shanghai University, Shanghai 200444, People's Republic of China
| | - Heng Gao
- Physics Department, International Center for Quantum and Molecular Structures, Materials Genome Institute, State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of High Temperature Superconductors, Shanghai University, Shanghai 200444, People's Republic of China
- Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials (Anhui University of Technology), Ministry of Education, Maanshan 243002, People's Republic of China
- Center for Spintronics and Quantum Systems, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China
| | - Fanhao Jia
- Physics Department, International Center for Quantum and Molecular Structures, Materials Genome Institute, State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of High Temperature Superconductors, Shanghai University, Shanghai 200444, People's Republic of China
| | - Myung-Hwan Whangbo
- Department of Chemistry, North Carolina State University, Raleigh, NC 27695-8204, United States of America
| | - Wei Ren
- Physics Department, International Center for Quantum and Molecular Structures, Materials Genome Institute, State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of High Temperature Superconductors, Shanghai University, Shanghai 200444, People's Republic of China
| |
Collapse
|
9
|
Dutta K, Singh R. Magnetoelastic coupling and critical behavior of some strongly correlated magnetic systems. J Phys Condens Matter 2022; 35:083001. [PMID: 33412540 DOI: 10.1088/1361-648x/abd99d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Accepted: 01/07/2021] [Indexed: 06/12/2023]
Abstract
The strongly correlated magnetic systems are attracting continuous attention in current condensed matter research due to their very compelling physics and promising technological applications. Being a host to charge, spin, and lattice degrees of freedom, such materials exhibit a variety of phases, and investigation of their physical behavior near such a phase transition bears an immense possibility. This review summarizes the recent progress in elucidating the role of magnetoelastic coupling on the critical behavior of some technologically important class of strongly correlated magnetic systems such as perovskite magnetites, uranium ferromagnetic superconductors, and multiferroic hexagonal manganites. It begins with encapsulation of various experimental findings and then proceeds toward describing how such experiments motivate theories within the Ginzburg-Landau phenomenological picture in order to capture the physics near a magnetic phase transition of such systems. The theoretical results that are obtained by implementing Wilson's renormalization-group to nonlocal Ginzburg-Landau model Hamiltonians are also highlighted. A list of possible experimental realizations of the coupled model Hamiltonians elucidates the importance of spin-lattice coupling near a critical point of strongly correlated magnetic systems.
Collapse
Affiliation(s)
- Kishore Dutta
- Department of Physics, Handique Girls' College, Guwahati 781 001, India
| | - Rohit Singh
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110 067, India
| |
Collapse
|
10
|
Shan W, Luo W. Interfacial charge transfer induced antiferromagnetic metals and magnetic phase transition in (CrO 2) m/(TaO 2) nsuperlattices. J Phys Condens Matter 2022; 35:035801. [PMID: 36351299 DOI: 10.1088/1361-648x/aca19a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 11/09/2022] [Indexed: 06/16/2023]
Abstract
As a class of remarkable spintronic materials, intrinsic antiferromagnetic (AFM) metals are rare. The exploration and investigation of AFM metals are still in its infancy. Based on first-principles calculations, the interface-induced magnetic phenomena in the (CrO2)m/(TaO2)nsuperlattices are investigated, and a new series of AFM metals is predicted. Under different ratios ofm:nwith varying valence states of Cr, the (CrO2)m/(TaO2)nsuperlattices exhibit three different phases, including the AFM metal, the AFM semiconductor, and the ferromagnetic (FM) metal. In the AFM semiconducting phases, theintra-CrO2-monolayer magnetic exchange interaction is systematically discussed, corresponding tom = 1 orm = 2. Both the localization of the Cr 3 dorbitals and the crystal-field splitting are crucial for magnetic ordering in super-exchange interactions. Based on the analyses of the AFM semiconducting phases withm = 1 andm = 2, the mechanisms of AFM metallic phases with radios ofm:n<1/2and1/2<m:n<1/1are discussed in detail. Additionally, the AFM metallic superlattices can be tuned into a FM metallic phase by applying strain in thec-direction, such as a compression of 7% in the (CrO2)1/(TaO2)3superlattice, and a tensile strain of 7% in the (CrO2)2/(TaO2)3superlattice. The phase diagram of the (CrO2)m/(TaO2)nsuperlattices is obtained as a function of the layer thickness. This work provides new insights about realizing and manipulating AFM metals in artificial superlattices or heterostructures in experiments.
Collapse
Affiliation(s)
- Wanfei Shan
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Weidong Luo
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
- Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| |
Collapse
|
11
|
Cao C, Chen S, Cui B, Yu G, Jiang C, Yang Z, Qiu X, Shang T, Xu Y, Zhan Q. Efficient Tuning of the Spin-Orbit Torque via the Magnetic Phase Transition of FeRh. ACS Nano 2022; 16:12727-12737. [PMID: 35943059 DOI: 10.1021/acsnano.2c04488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The understanding and control of the spin-orbit torque (SOT) are central to antiferromagnetic spintronics. Despite the fact that a giant SOT efficiency has been achieved in numerous materials, its efficient tuning in a given material has not been established. Materials with magnetic phase transitions (MPTs) offer a new perspective, as the SOT efficiency may vary significantly for the different magnetic orderings across the transition, and the transition itself can be readily tuned by various control parameters. This work reports that the SOT efficiency of a FeRh-based perpendicular magnetized heterostructure can be significantly tuned by varying the temperature across the MPT. The SOT efficiency exhibits a temperature hysteresis associated with the first-order nature of the MPT, and its value in the ferromagnetic phase is seen to be enhanced by ∼450%, simply by a lowering of temperature to drive FeRh into the antiferromagnetic phase. Furthermore, current-induced magnetization switching can be achieved without an assistant magnetic field for both ferromagnetic and antiferromagnetic FeRh, with a low critical switching current density for the latter. These results not only directly establish FeRh as an efficient spin generator but also present a strategy to dynamically tune SOT via varying the temperature across MPTs.
Collapse
Affiliation(s)
- Cuimei Cao
- Key Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal University, Shanghai 200241, People's Republic of China
| | - Shiwei Chen
- Shanghai Key Laboratory of Special Artificial Microstructure Materials, School of Physics Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
| | - Baoshan Cui
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
- Beijing National Laboratory for Condensed Matter, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Guoqiang Yu
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, People's Republic of China
- Beijing National Laboratory for Condensed Matter, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Changhuan Jiang
- Key Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal University, Shanghai 200241, People's Republic of China
| | - Zhenzhong Yang
- Key Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal University, Shanghai 200241, People's Republic of China
| | - Xuepeng Qiu
- Shanghai Key Laboratory of Special Artificial Microstructure Materials, School of Physics Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China
| | - Tian Shang
- Key Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal University, Shanghai 200241, People's Republic of China
| | - Yang Xu
- Key Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal University, Shanghai 200241, People's Republic of China
| | - Qingfeng Zhan
- Key Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal University, Shanghai 200241, People's Republic of China
| |
Collapse
|
12
|
Zhang F, Zhang J, Nan H, Fang D, Zhang GX, Zhang Y, Liu L, Wang D. Magnetic phase transition of monolayer chromium trihalides investigated with machine learning: toward a universal magnetic Hamiltonian. J Phys Condens Matter 2022; 34:395901. [PMID: 35817029 DOI: 10.1088/1361-648x/ac8037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 07/11/2022] [Indexed: 06/15/2023]
Abstract
The prediction of magnetic phase transitions often requires model Hamiltonians to describe the necessary magnetic interactions. The advance of machine learning provides an opportunity to build a unified approach that can treat various magnetic systems without proposing new model Hamiltonians. Here, we develop such an approach by proposing a novel set of descriptors that describes the magnetic interactions and training the artificial neural network (ANN) that plays the role of a universal magnetic Hamiltonian. We then employ this approach and Monte Carlo simulation to investigate the magnetic phase transition of two-dimensional monolayer chromium trihalides using the trained ANNs as energy calculator. We show that the machine-learning-based approach shows advantages over traditional methods in the investigation of ferromagnetic and antiferromagnetic phase transitions, demonstrating its potential for other magnetic systems.
Collapse
Affiliation(s)
- F Zhang
- School of Microelectronics & State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
- Key Lab of Micro-Nano Electronics and System Integration of Xi'an City, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| | - J Zhang
- School of Microelectronics & State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
- Key Lab of Micro-Nano Electronics and System Integration of Xi'an City, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| | - H Nan
- School of Microelectronics & State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
- Key Lab of Micro-Nano Electronics and System Integration of Xi'an City, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| | - D Fang
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| | - G-X Zhang
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
| | - Y Zhang
- School of Physics, Henan Normal University, Xinxiang 453007, People's Republic of China
| | - L Liu
- Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources in Guangxi, Guilin University of Technology, Guilin, 541004, People's Republic of China
| | - D Wang
- School of Microelectronics & State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
- Key Lab of Micro-Nano Electronics and System Integration of Xi'an City, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China
| |
Collapse
|
13
|
Tan C, Xie WQ, Zheng G, Aloufi N, Albarakati S, Algarni M, Li J, Partridge J, Culcer D, Wang X, Yi JB, Tian M, Xiong Y, Zhao YJ, Wang L. Gate-Controlled Magnetic Phase Transition in a van der Waals Magnet Fe 5GeTe 2. Nano Lett 2021; 21:5599-5605. [PMID: 34152781 DOI: 10.1021/acs.nanolett.1c01108] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Magnetic van der Waals (vdW) materials are poised to enable all-electrical control of magnetism in the two-dimensional limit. However, tuning the magnetic ground state in vdW itinerant ferromagnets by voltage-induced charge doping remains a significant challenge, due to the extremely large carrier densities in these materials. Here, by cleaving the vdW itinerant ferromagnet Fe5GeTe2 (F5GT) into 5.4 nm (around two unit cells), we find that the ferromagnetism (FM) in F5GT can be substantially tuned by the thickness. Moreover, by utilizing a solid protonic gate, an electron doping concentration of above 1021 cm-3 has been exhibited in F5GT nanosheets. Such a high carrier accumulation exceeds that possible in widely used electric double-layer transistors (EDLTs) and surpasses the intrinsic carrier density of F5GT. Importantly, it is accompanied by a magnetic phase transition from FM to antiferromagnetism (AFM). The realization of an antiferromagnetic phase in nanosheet F5GT suggests the promise of applications in high-temperature antiferromagnetic vdW devices and heterostructures.
Collapse
Affiliation(s)
- Cheng Tan
- School of Science, RMIT University, Melbourne, Victoria 3001, Australia
| | - Wen-Qiang Xie
- Department of Physics, South China University of Technology, Guangzhou 510640, China
| | - Guolin Zheng
- School of Science, RMIT University, Melbourne, Victoria 3001, Australia
| | - Nuriyah Aloufi
- School of Science, RMIT University, Melbourne, Victoria 3001, Australia
| | - Sultan Albarakati
- School of Science, RMIT University, Melbourne, Victoria 3001, Australia
| | - Meri Algarni
- School of Science, RMIT University, Melbourne, Victoria 3001, Australia
| | - Junbo Li
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences (CAS), Hefei 230031, Anhui, China
| | - James Partridge
- School of Science, RMIT University, Melbourne, Victoria 3001, Australia
| | - Dimitrie Culcer
- School of Physics and ARC Centre of Excellence in Future Low-Energy Electronics Technologies, UNSW Node, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Xiaolin Wang
- Institute for Superconducting & Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Wollongong, New South Wales 2500, Australia
- ARC Centre for Future Low-Energy Electronics Technologies (FLEET), University of Wollongong, Wollongong, New South Wales 2500, Australia
| | - Jia Bao Yi
- Global Innovative Center for Advanced Nanomaterials, School of Engineering, University of Newcastle, Callaghan, New South Wales 2308, Australia
| | - Mingliang Tian
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences (CAS), Hefei 230031, Anhui, China
- Department of Physics, School of Physics and Materials Science, Anhui University, Hefei 230601, Anhui, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Yimin Xiong
- Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences (CAS), Hefei 230031, Anhui, China
| | - Yu-Jun Zhao
- Department of Physics, South China University of Technology, Guangzhou 510640, China
| | - Lan Wang
- School of Science, RMIT University, Melbourne, Victoria 3001, Australia
| |
Collapse
|
14
|
Guo X, Jin W, Ye Z, Ye G, Xie H, Yang B, Kim HH, Yan S, Fu Y, Tian S, Lei H, Tsen AW, Sun K, Yan JA, He R, Zhao L. Structural Monoclinicity and Its Coupling to Layered Magnetism in Few-Layer CrI 3. ACS Nano 2021; 15:10444-10450. [PMID: 34075751 DOI: 10.1021/acsnano.1c02868] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Using polarization-resolved Raman spectroscopy, we investigate layer number, temperature, and magnetic field dependence of Raman spectra in one- to four-layer CrI3. Layer-number-dependent Raman spectra show that in the paramagnetic phase a doubly degenerated Eg mode of monolayer CrI3 splits into one Ag and one Bg mode in N-layer (N > 1) CrI3 due to the monoclinic stacking. Their energy separation increases in thicker samples until an eventual saturation. Temperature-dependent measurements further show that the split modes tend to merge upon cooling but remain separated until 10 K, indicating a failed attempt of the monoclinic-to-rhombohedral structural phase transition that is present in the bulk crystal. Magnetic-field-dependent measurements reveal an additional monoclinic distortion across the magnetic-field-induced layered antiferromagnetism-to-ferromagnetism phase transition. We propose a structural change that consists of both a lateral sliding toward the rhombohedral stacking and a decrease in the interlayer distance to explain our experimental observations.
Collapse
Affiliation(s)
- Xiaoyu Guo
- Department of Physics, University of Michigan, 450 Church Street, Ann Arbor, Michigan 48109, United States
| | - Wencan Jin
- Department of Physics, Auburn University, 380 Duncan Drive, Auburn, Alabama 36849, United States
| | - Zhipeng Ye
- Department of Electrical and Computer Engineering, Texas Tech University, 910 Boston Avenue, Lubbock, Texas 79409, United States
| | - Gaihua Ye
- Department of Electrical and Computer Engineering, Texas Tech University, 910 Boston Avenue, Lubbock, Texas 79409, United States
| | - Hongchao Xie
- Department of Physics, University of Michigan, 450 Church Street, Ann Arbor, Michigan 48109, United States
| | - Bowen Yang
- Institute for Quantum Computing, Department of Physics and Astronomy, and Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Hyun Ho Kim
- School of Materials Science and Engineering, Kumoh National Institute of Technology, Gumi 39177, Korea
| | - Shaohua Yan
- Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices, Renmin University of China, 100872 Beijing, China
| | - Yang Fu
- Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices, Renmin University of China, 100872 Beijing, China
| | - Shangjie Tian
- Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices, Renmin University of China, 100872 Beijing, China
| | - Hechang Lei
- Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices, Renmin University of China, 100872 Beijing, China
| | - Adam W Tsen
- Institute for Quantum Computing, Department of Physics and Astronomy, and Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Kai Sun
- Department of Physics, University of Michigan, 450 Church Street, Ann Arbor, Michigan 48109, United States
| | - Jia-An Yan
- Department of Physics, Astronomy & Geosciences, Towson University, Towson, Maryland 21252, United States
| | - Rui He
- Department of Electrical and Computer Engineering, Texas Tech University, 910 Boston Avenue, Lubbock, Texas 79409, United States
| | - Liuyan Zhao
- Department of Physics, University of Michigan, 450 Church Street, Ann Arbor, Michigan 48109, United States
| |
Collapse
|
15
|
Mazumdar D, Rawat R, Banik S, Das K, Das I. Real-space imaging of magnetic phase transformation in single crystalline Sm-Ca-Sr based manganite compound. J Phys Condens Matter 2021; 33:235402. [PMID: 33836523 DOI: 10.1088/1361-648x/abf6a7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 04/09/2021] [Indexed: 06/12/2023]
Abstract
Low-temperature-high-magnetic field magnetic force microscopy studies on colossal magnetoresistance material Sm0.5Ca0.25Sr0.25MnO3have been carried out. These measurements provide real-space visualization of antiferromagnetic-ferromagnetic (AFM-FM) transition on sub-micron length scale and explain the presence of AFM-FM transition in the temperature-dependent magnetization measurements, but the absence of corresponding metal-insulator transition in temperature-dependent resistivity measurements at the low magnetic field. Distribution of transition temperature over the scanned area indicates towards the quench disorder broadening of the first-order magnetic phase transition. It shows that the length scale of chemical inhomogeneity extends over several micrometers.
Collapse
Affiliation(s)
- Dipak Mazumdar
- Saha Institute of Nuclear Physics, HBNI, 1/AF, Bidhannagar, Kolkata 700 064, India
| | - Rajeev Rawat
- UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 425001, India
| | - Sanjib Banik
- Saha Institute of Nuclear Physics, HBNI, 1/AF, Bidhannagar, Kolkata 700 064, India
- Experimentelle Physik 3 (EP III), University of Wuerzburg, 97074 Wurzburg, Germany
| | - Kalipada Das
- Seth Anandram Jaipuria College, 10 Raja Naba Krishna Street, Kolkata 700005, India
| | - I Das
- Saha Institute of Nuclear Physics, HBNI, 1/AF, Bidhannagar, Kolkata 700 064, India
| |
Collapse
|
16
|
Kolev S, Peneva P, Krezhov K, Malakova T, Ghelev C, Koutzarova T, Kovacheva D, Vertruyen B, Closset R, Maria Tran L, Zaleski A. Structural, Magnetic and Microwave Characterization of Polycrystalline Z-Type Sr 3Co 2Fe 24O 41 Hexaferrite. Materials (Basel) 2020; 13:ma13102355. [PMID: 32443907 PMCID: PMC7288336 DOI: 10.3390/ma13102355] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 05/12/2020] [Accepted: 05/19/2020] [Indexed: 11/16/2022]
Abstract
We report results on the structural and microwave properties and magnetic phase transitions in polycrystalline Sr3Co2Fe24O41 hexaferrite synthesized by sol-gel auto-combustion and acting as a filler in a composite microwave absorbing material. The zero-field-cooled (ZFC) and field-cooled (FC) magnetization curves revealed a change in the magnetization behavior at 293 K. The reflection losses in the 1-20 GHz range of the Sr3Co2Fe24O41 powder dispersed homogeneously in a polymer matrix of silicon rubber were investigated in both the absence and presence of a magnetic field. In the latter case, a dramatic rise in the attenuation was observed. The microwave reflection losses reached the maximum value of 32.63 dB at 17.29 GHz in the Ku-band. The sensitivity of the microwave properties of the composite material to the external magnetic field was manifested by the appearance of new reflection losses maxima. At a fixed thickness tm of the composite, the attenuation peak frequency can be adjusted to a certain value either by changing the filling density or by applying an external magnetic field.
Collapse
Affiliation(s)
- Svetoslav Kolev
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria; (P.P.); (K.K.); (T.M.); (C.G.); (T.K.)
- Correspondence: ; Tel.: +359-2-979-5871
| | - Petya Peneva
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria; (P.P.); (K.K.); (T.M.); (C.G.); (T.K.)
| | - Kiril Krezhov
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria; (P.P.); (K.K.); (T.M.); (C.G.); (T.K.)
| | - Tanya Malakova
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria; (P.P.); (K.K.); (T.M.); (C.G.); (T.K.)
| | - Chavdar Ghelev
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria; (P.P.); (K.K.); (T.M.); (C.G.); (T.K.)
| | - Tatyana Koutzarova
- Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, 1784 Sofia, Bulgaria; (P.P.); (K.K.); (T.M.); (C.G.); (T.K.)
| | - Daniela Kovacheva
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Academy Georgi Bonchev Street, bld. 11, 1113 Sofia, Bulgaria;
| | - Benedicte Vertruyen
- Greenmat, Chemistry Department, University of Liege, 11 allée du 6 août, 4000 Liège, Belgium; (B.V.); (R.C.)
| | - Raphael Closset
- Greenmat, Chemistry Department, University of Liege, 11 allée du 6 août, 4000 Liège, Belgium; (B.V.); (R.C.)
| | - Lan Maria Tran
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Ul. Okólna 2, 50-422 Wroclaw, Poland; (L.M.T.); (A.Z.)
| | - Andrzej Zaleski
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Ul. Okólna 2, 50-422 Wroclaw, Poland; (L.M.T.); (A.Z.)
| |
Collapse
|
17
|
Lim ZS, Li C, Chi X, Omar GJ, Ma HH, Huang Z, Zeng S, Yang P, Venkatesan T, Rusydi A, Pennycook SJ, Ariando A. Magnetic Anisotropy of a Quasi Two-Dimensional Canted Antiferromagnet. Nano Lett 2020; 20:1890-1895. [PMID: 32004008 DOI: 10.1021/acs.nanolett.9b05120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We report the control of the interplane magnetic exchange coupling in CaIrO3 perovskite thin films and superlattices with SrTiO3. By analyzing the anisotropic magneto-transport data, we demonstrate that a semimetallic paramagnetic CaIrO3 turns into a canted antiferromagnetic Mott insulator at reduced dimensions. The emergence of a biaxial magneto-crystalline anisotropy indicates the canted moment responding to the cubic symmetry. Extending to superlattices and probing oxygen octahedral rotation by half-integer X-ray Braggs diffraction, a more complete picture about the canted moment evolution with interplane coupling can be understood. Remarkably, a rotation of the canted moments' easy axes by 45° is also observed by a sign reversal of the in-plane strain. These results demonstrate the robustness of anisotropic magnetoresistance in revealing quasi two-dimensional canted antiferromagnets, as well as valuable insights about quadrupolar magnetoelastic coupling, relevant for designing future antiferromagnetic spintronic devices.
Collapse
Affiliation(s)
- Zhi Shiuh Lim
- NUSNNI-NanoCore, National University of Singapore, Singapore 117411
- Department of Physics, National University of Singapore, Singapore 117542
| | - Changjian Li
- NUSNNI-NanoCore, National University of Singapore, Singapore 117411
- Department of Materials Science and Engineering, National University of Singapore, Singapore 119077
| | - Xiao Chi
- Department of Physics, National University of Singapore, Singapore 117542
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, 5 Research Link, Singapore 117603
| | - Ganesh Ji Omar
- NUSNNI-NanoCore, National University of Singapore, Singapore 117411
- Department of Physics, National University of Singapore, Singapore 117542
| | - Haijiao Harsan Ma
- NUSNNI-NanoCore, National University of Singapore, Singapore 117411
- Department of Physics, National University of Singapore, Singapore 117542
| | - Zhen Huang
- NUSNNI-NanoCore, National University of Singapore, Singapore 117411
| | - Shengwei Zeng
- NUSNNI-NanoCore, National University of Singapore, Singapore 117411
- Department of Physics, National University of Singapore, Singapore 117542
| | - Ping Yang
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, 5 Research Link, Singapore 117603
| | - Thirumalai Venkatesan
- NUSNNI-NanoCore, National University of Singapore, Singapore 117411
- Department of Physics, National University of Singapore, Singapore 117542
- Department of Materials Science and Engineering, National University of Singapore, Singapore 119077
| | - Andrivo Rusydi
- Department of Physics, National University of Singapore, Singapore 117542
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, 5 Research Link, Singapore 117603
| | - Stephen John Pennycook
- Department of Materials Science and Engineering, National University of Singapore, Singapore 119077
| | - Ariando Ariando
- NUSNNI-NanoCore, National University of Singapore, Singapore 117411
- Department of Physics, National University of Singapore, Singapore 117542
| |
Collapse
|
18
|
Zhang J, Zhou G, Yan Z, Ji H, Li X, Quan Z, Bai Y, Xu X. Interfacial Ferromagnetic Coupling and Positive Spontaneous Exchange Bias in SrFeO 3-x/La 0.7Sr 0.3MnO 3 Bilayers. ACS Appl Mater Interfaces 2019; 11:26460-26466. [PMID: 31267730 DOI: 10.1021/acsami.9b07639] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Negative exchange bias is usually discovered in ferromagnetic (FM)/antiferromagnetic (AFM) heterostructures after a field-cooling (FC) process. Relatively, positive exchange bias (PEB) is a rarely observed phenomenon. So far, almost all of the models for PEB whether undergoing FC or zero-field-cooling (ZFC) treatment have been explained by an interaction of strong AFM coupling at the interface. In this work, by selecting a special material of SrFeO3-x as the AFM layer, coupled with FM-La0.7Sr0.3MnO3 (LSMO), we obtain a novel PEB effect of the bilayer after ZFC measurement, of which the shift directions are unfixable and dependent on the initial magnetization direction. Based on a transient magnetic field to control the remanence (Mr) direction of LSMO at room temperature and then cooling below the TN of SrFeO3-x without any magnetic field disturbance, the shift direction can be locked only toward the transient magnetic field. Combined with experimental results and first-principles calculations, we propose that the above phenomena are explained as the field-induced AFM phase of SrFeO3-x transforming into the FM phase at an FM coupling bilayer interface. Thus, our finding may provide a new approach to realize and tune the zero-field-cooling PEB with FM coupling heterostructures.
Collapse
Affiliation(s)
- Jun Zhang
- School of Chemistry and Materials Science of Shanxi Normal University & Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education , Linfen 041004 , China
- Department of Chemistry & Chemical Engineering , Lvliang University , Lishi 033001 , China
- Research Institute of Materials Science of Shanxi Normal University & Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Technology , Linfen 041004 , China
| | - Guowei Zhou
- School of Chemistry and Materials Science of Shanxi Normal University & Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education , Linfen 041004 , China
- Research Institute of Materials Science of Shanxi Normal University & Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Technology , Linfen 041004 , China
| | - Zhi Yan
- School of Chemistry and Materials Science of Shanxi Normal University & Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education , Linfen 041004 , China
| | - Huihui Ji
- School of Chemistry and Materials Science of Shanxi Normal University & Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education , Linfen 041004 , China
| | - Xiaoli Li
- School of Chemistry and Materials Science of Shanxi Normal University & Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education , Linfen 041004 , China
- Research Institute of Materials Science of Shanxi Normal University & Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Technology , Linfen 041004 , China
| | - Zhiyong Quan
- School of Chemistry and Materials Science of Shanxi Normal University & Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education , Linfen 041004 , China
- Research Institute of Materials Science of Shanxi Normal University & Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Technology , Linfen 041004 , China
| | - Yuhao Bai
- Research Institute of Materials Science of Shanxi Normal University & Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Technology , Linfen 041004 , China
| | - Xiaohong Xu
- School of Chemistry and Materials Science of Shanxi Normal University & Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education , Linfen 041004 , China
- Research Institute of Materials Science of Shanxi Normal University & Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Technology , Linfen 041004 , China
| |
Collapse
|
19
|
Cai X, Song T, Wilson NP, Clark G, He M, Zhang X, Taniguchi T, Watanabe K, Yao W, Xiao D, McGuire MA, Cobden DH, Xu X. Atomically Thin CrCl 3: An In-Plane Layered Antiferromagnetic Insulator. Nano Lett 2019; 19:3993-3998. [PMID: 31083954 DOI: 10.1021/acs.nanolett.9b01317] [Citation(s) in RCA: 88] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The recent discovery of magnetism in atomically thin layers of van der Waals (vdW) crystals has created new opportunities for exploring magnetic phenomena in the two-dimensional (2D) limit. In most 2D magnets studied to date, the c-axis is an easy axis, so that at zero applied field the polarization of each layer is perpendicular to the plane. Here, we demonstrate that atomically thin CrCl3 is a layered antiferromagnetic insulator with an easy-plane normal to the c-axis, that is, the polarization is in the plane of each layer and has no preferred direction within it. Ligand-field photoluminescence at 870 nm is observed down to the monolayer limit, demonstrating its insulating properties. We investigate the in-plane magnetic order using tunneling magnetoresistance in graphene/CrCl3/graphene tunnel junctions, establishing that the interlayer coupling is antiferromagnetic down to the bilayer. From the temperature dependence of the magnetoresistance, we obtain an effective magnetic phase diagram for the bilayer. Our result shows that CrCl3 should be useful for studying the physics of 2D phase transitions and for making new kinds of vdW spintronic devices.
Collapse
Affiliation(s)
- Xinghan Cai
- Department of Physics , University of Washington , Seattle , Washington 98195 , United States
- National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Department of Micro/Nano Electronics , Shanghai Jiao Tong University , Shanghai 200240 , China
| | - Tiancheng Song
- Department of Physics , University of Washington , Seattle , Washington 98195 , United States
| | - Nathan P Wilson
- Department of Physics , University of Washington , Seattle , Washington 98195 , United States
| | - Genevieve Clark
- Department of Materials Science and Engineering , University of Washington , Seattle , Washington 98195 , United States
| | - Minhao He
- Department of Physics , University of Washington , Seattle , Washington 98195 , United States
| | - Xiaoou Zhang
- Department of Physics , Carnegie Mellon University , Pittsburgh , Pennsylvania 15213 , United States
| | - Takashi Taniguchi
- National Institute for Materials Science , Tsukuba , Ibaraki 305-0044 , Japan
| | - Kenji Watanabe
- National Institute for Materials Science , Tsukuba , Ibaraki 305-0044 , Japan
| | - Wang Yao
- Department of Physics and Center of Theoretical and Computational Physics , University of Hong Kong , Hong Kong , China
| | - Di Xiao
- Department of Physics , Carnegie Mellon University , Pittsburgh , Pennsylvania 15213 , United States
| | - Michael A McGuire
- Materials Science and Technology Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - David H Cobden
- Department of Physics , University of Washington , Seattle , Washington 98195 , United States
| | - Xiaodong Xu
- Department of Physics , University of Washington , Seattle , Washington 98195 , United States
- Department of Materials Science and Engineering , University of Washington , Seattle , Washington 98195 , United States
| |
Collapse
|
20
|
Abstract
The change of bonding status, typically occurring only in chemical processes, could dramatically alter the material properties. Here, we show that a tunable breaking and forming of a diatomic bond can be achieved through physical means, i.e., by a moderate biaxial strain, in the newly discovered MoN2 two-dimensional (2D) material. On the basis of first-principles calculations, we predict that as the lattice parameter is increased under strain, there exists an isostructural phase transition at which the N-N distance has a sudden drop, corresponding to the transition from a N-N nonbonding state to a N-N single bond state. Remarkably, the bonding change also induces a magnetic phase transition, during which the magnetic moments transfer from the N(2p) sublattice to the Mo(4d) sublattice; meanwhile, the type of magnetic coupling is changed from ferromagnetic to antiferromagnetic. We provide a physical picture for understanding these striking effects. The discovery is not only of great scientific interest in exploring unusual phase transitions in low-dimensional systems, but it also reveals the great potential of the 2D MoN2 material in the nanoscale mechanical, electronic, and spintronic applications.
Collapse
Affiliation(s)
- Yao Wang
- International Center for New-Structured Materials (ICNSM) and School of Materials Science and Engineering, Zhejiang University , Hangzhou 310027, China
- State Key Laboratory of Silicon Materials, Zhejiang University , Hangzhou 310027, China
| | - Shan-Shan Wang
- Research Laboratory for Quantum Materials, Singapore University of Technology and Design , Singapore 487372, Singapore
| | - Yunhao Lu
- International Center for New-Structured Materials (ICNSM) and School of Materials Science and Engineering, Zhejiang University , Hangzhou 310027, China
- State Key Laboratory of Silicon Materials, Zhejiang University , Hangzhou 310027, China
| | - Jianzhong Jiang
- International Center for New-Structured Materials (ICNSM) and School of Materials Science and Engineering, Zhejiang University , Hangzhou 310027, China
- State Key Laboratory of Silicon Materials, Zhejiang University , Hangzhou 310027, China
| | - Shengyuan A Yang
- Research Laboratory for Quantum Materials, Singapore University of Technology and Design , Singapore 487372, Singapore
| |
Collapse
|