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Zhao Z, Liu Z, Edmonds MT, Medhekar NV. CoX 2Y 4: a family of two-dimensional magnets with versatile magnetic order. NANOSCALE HORIZONS 2024. [PMID: 39140209 DOI: 10.1039/d4nh00103f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/15/2024]
Abstract
Two-dimensional (2D) magnetic materials offer a promising platform for nanoscale spintronics and for exploration of novel physical phenomena. Here, we predict a diverse range of magnetic orders in cobalt-based 2D single septuple layers CoX2Y4, namely, CoBi2Te4, CoBi2Se2Te2, CoBi2Se4, and CoSb2Te4. Notably, CoBi2Te4 presents intrinsic non-collinear antiferromagnetism (AFM), while the others display collinear AFM. The emergence of AFM in all CoX2Y4 materials is attributed to the antiferromagnetic 90° Co-Te(Se)-Co superexchange coupling. The origin of non-collinear/collinear orders lies in competing Heisenberg exchange interactions within the Co triangular lattice. A pivotal factor governing the non-collinear order of CoBi2Te4 is the vanishingly small ratio of exchange coupling between next-nearest neighbour Co and the nearest neighbour Co (J2/J1 ∼ 0.01). Furthermore, our investigation into strain effects on CoX2Y4 lattices demonstrates the tunability of the magnetic state of CoSb2Te4 from collinear to non-collinear. Our prediction of the unique non-collinear AFM in 2D suggests the potential for observing extraordinary magnetic phenomena in 2D, including non-collinear scattering and magnetic domain walls.
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Affiliation(s)
- Ziyuan Zhao
- Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia.
- ARC Centre of Excellence in Future Low-Energy Electronics Technologies FLEET, Monash University, Clayton, Victoria 3800, Australia
| | - Zhao Liu
- Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia.
- ARC Centre of Excellence in Future Low-Energy Electronics Technologies FLEET, Monash University, Clayton, Victoria 3800, Australia
| | - Mark T Edmonds
- ARC Centre of Excellence in Future Low-Energy Electronics Technologies FLEET, Monash University, Clayton, Victoria 3800, Australia
- School of Physics and Astronomy, Monash University, Clayton, Victoria 3800, Australia
| | - Nikhil V Medhekar
- Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia.
- ARC Centre of Excellence in Future Low-Energy Electronics Technologies FLEET, Monash University, Clayton, Victoria 3800, Australia
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Jia M, Jin C, Wang B, Wang B. Ferroelectric polarization promotes a CdS/In 2Se 3 heterostructure for photocatalytic water splitting. Phys Chem Chem Phys 2024; 26:16637-16645. [PMID: 38808387 DOI: 10.1039/d3cp05551e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
The rapid recombination of photogenerated electrons and holes greatly limits the efficiency of photocatalyst based on semiconductor. In order to address this issue, we predicted a novel ferroelectric polarized heterojunction photocatalyst, CdS/In2Se3, which enables the spontaneous overall water splitting reaction. The CdS/In2Se3 heterojunction exhibits a band-edge staggered alignment and it is easy to form a direct Z-scheme charge transfer pathway. Besides, the built-in electric field (Eint) in the CdS/In2Se3 heterojunction promoted the charge transfer of CdS/In2Se3, leading to an improved separating efficiency of photo-generated carriers. Moreover, the vertical intrinsic polarized electric field (Ep) not only alters the position of the band edge but also reduces the bandgap limitations commonly associated with photocatalytic materials. Furthermore, the CdS/In2Se3 heterojunctions demonstrate separate catalytic activity for the hydrogen evolution reaction (HER) on the surface of the CdS monolayer and oxygen evolution reaction (OER) on the surface of In2Se3, respectively. Notably, the CdS/In2Se3-down configuration enables spontaneous photocatalytic water splitting in pH = 7, while the CdS/In2Se3-up configuration efficiently facilitates the HER process. This study highlights the significant advantages of CdS/In2Se3 heterojunctions as photocatalytic materials, offering unique insights into the development and research of this promising heterojunction architecture.
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Affiliation(s)
- Minglei Jia
- School of Electro-Mechanical Engineering, Zhongyuan Institute of Science and Technology, Xuchang 461000, China.
| | - Chao Jin
- Institute for Computational Materials Science, Joint Center for Theoretical Physics (JCTP), School of Physics and Electronics, Henan University, Kaifeng, 475004, China.
| | - Baoshan Wang
- Zibo Huatian Rubber Plastic Technology CO. LTD, Zibo, 256410, China
| | - Bing Wang
- Institute for Computational Materials Science, Joint Center for Theoretical Physics (JCTP), School of Physics and Electronics, Henan University, Kaifeng, 475004, China.
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Jia C, Jin C, Shi P, Su J, Zhang Y, Niu X, Wang B. Toward intrinsic ultra-high-temperature ferromagnetism in a CrAuTe 2/graphene heterosystem. Phys Chem Chem Phys 2024; 26:2134-2139. [PMID: 38131398 DOI: 10.1039/d3cp02155f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
Exploring intrinsic two-dimensional (2D) ferromagnetic (FM) materials with high Curie temperatures (TC) and large magnetic anisotropy energies (MAE) is one of the effective solutions to develop materials for high-performance spintronic applications. Using density functional theory calculations and high-throughput computations, we predict an intrinsic bimetallic FM monolayer, CrAuTe2, which has a large MAE and high TC. The results show that the value of the MAE can reach about 1.5 meV per Cr, and Monte Carlo simulations show that the TC of monolayer CrAuTe2 is about 840 K. Further analysis indicates that the joint effects of spin-orbit coupling (SOC) interaction and magnetic dipole-dipole interaction result in high in-plane magnetic anisotropy. In addition, this monolayer has good dynamic, thermal, and mechanical stabilities, which were confirmed by ab initio molecular dynamics simulations, phonon spectra, and elastic constants, respectively. In order to propose a practical synthesis approach, we built a CrAuTe2/graphene van der Waals heterostructure, and found that the heterostructure does not affect the magnetic properties of monolayer CrAuTe2. These findings appear promising for the future applications in nano-spintronics.
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Affiliation(s)
- Chaobin Jia
- Joint Center for Theoretical Physics (JCTP), Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng, 475004, People's Republic of China.
| | - Chao Jin
- Joint Center for Theoretical Physics (JCTP), Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng, 475004, People's Republic of China.
| | - Puyuan Shi
- Joint Center for Theoretical Physics (JCTP), Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng, 475004, People's Republic of China.
| | - Jingjuan Su
- Joint Center for Theoretical Physics (JCTP), Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng, 475004, People's Republic of China.
| | - Yungeng Zhang
- Joint Center for Theoretical Physics (JCTP), Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng, 475004, People's Republic of China.
| | - Xianghong Niu
- School of Science, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China.
| | - Bing Wang
- Joint Center for Theoretical Physics (JCTP), Institute for Computational Materials Science, School of Physics and Electronics, Henan University, Kaifeng, 475004, People's Republic of China.
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Zhang H, Guo N, Wang Z, Xiao Y, Zhu X, Wang S, Yao X, Liu Y, Zhang X. Two-Dimensional Transition Metal Boride TMB 12 (TM = V, Cr, Mn, and Fe) Monolayers: Robust Antiferromagnetic Semiconductors with Large Magnetic Anisotropy. Molecules 2023; 28:7945. [PMID: 38138435 PMCID: PMC10745289 DOI: 10.3390/molecules28247945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 11/14/2023] [Accepted: 11/19/2023] [Indexed: 12/24/2023] Open
Abstract
Currently, two-dimensional (2D) materials with intrinsic antiferromagnetism have stimulated research interest due to their insensitivity to external magnetic fields and absence of stray fields. Here, we predict a family of stable transition metal (TM) borides, TMB12 (TM = V, Cr, Mn, Fe) monolayers, by combining TM atoms and B12 icosahedra based on first-principles calculations. Our results show that the four TMB12 monolayers have stable antiferromagnetic (AFM) ground states with large magnetic anisotropic energy. Among them, three TMB12 (TM=V, Cr, Mn) monolayers display an in-plane easy magnetization axis, while the FeB12 monolayer has an out-of-plane easy magnetization axis. Among them, the CrB12 and the FeB12 monolayers are AFM semiconductors with band gaps of 0.13 eV and 0.35 eV, respectively. In particular, the AFM FeB12 monolayer is a spin-polarized AFM material with a Néel temperature of 125 K. Moreover, the electronic and magnetic properties of the CrB12 and the FeB12 monolayers can be modulated by imposing external biaxial strains. Our findings show that the TMB12 monolayers are candidates for designing 2D AFM materials, with potential applications in electronic devices.
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Affiliation(s)
- Huiqin Zhang
- College of Physics Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou 225002, China
| | - Nini Guo
- College of Physics and Hebei Advanced Thin Films Laboratory, Hebei Normal University, Shijiazhuang 050024, China
| | - Ziyu Wang
- College of Physics Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou 225002, China
| | - Yuqi Xiao
- College of Physics Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou 225002, China
| | - Xiangfei Zhu
- College of Physics Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou 225002, China
| | - Shu Wang
- College of Physics Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou 225002, China
| | - Xiaojing Yao
- College of Physics and Hebei Advanced Thin Films Laboratory, Hebei Normal University, Shijiazhuang 050024, China
| | - Yongjun Liu
- College of Physics Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou 225002, China
| | - Xiuyun Zhang
- College of Physics Science and Technology & Microelectronics Industry Research Institute, Yangzhou University, Yangzhou 225002, China
- Key Laboratory of Quantum Materials and Devices (Southeast University), Ministry of Education, Nanjing 200089, China
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Zhao H, Wang H, Tan W, Ren N, Ding L, Yu X, Wang A. A novel two-dimensional NiCl 2O 8 lattice with negative Poisson's ratio and magnetic modulation. Phys Chem Chem Phys 2023; 25:31050-31056. [PMID: 37942556 DOI: 10.1039/d3cp02400h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2023]
Abstract
Two-dimensional (2D) materials with simultaneous magnetic semiconducting properties and a negative Poisson's ratio are crucial for fabricating multifunctional electronic devices. However, progress in this area has been generally constrained. Based on first-principles calculations, we engineered a 2D Ni-based oxyhalide with a honeycomb lattice structure. It was observed that the NiCl2O8 monolayer exhibits both high- and low-buckling states in its geometry, along with intrinsic magnetic semiconductor properties in its electronic structure. Importantly, we demonstrated that the magnetic ordering of the NiCl2O8 lattice is susceptible to applied strain, which resulted in a phase transition from paramagnetic to ferromagnetic under biaxial strain. The Curie temperature was also evaluated using Monte Carlo simulations within the Ising model. Additionally, our research uncovered that the 2D NiCl2O8 lattice chain displays a negative Poisson's ratio (NPR) along the z-direction. The triangular hinge structure in its centrosymmetric configuration was identified as the origin of this unique phenomenon. The coexistence of NPR and magnetic phase transition properties in the NiCl2O8 lattice makes it quite promising for applications in nanoelectronic and spintronic devices.
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Affiliation(s)
- Hongbo Zhao
- Institute for Advanced Interdisciplinary Research, University of Jinan, Jinan, Shandong, 250022, China.
| | - Hongguang Wang
- Jinan Jingheng Electronics Co., Ltd, Jinan, Shandong, 250014, China
| | - Wei Tan
- Institute for Advanced Interdisciplinary Research, University of Jinan, Jinan, Shandong, 250022, China.
| | - Na Ren
- Institute for Advanced Interdisciplinary Research, University of Jinan, Jinan, Shandong, 250022, China.
| | - Longhua Ding
- Institute for Advanced Interdisciplinary Research, University of Jinan, Jinan, Shandong, 250022, China.
| | - Xin Yu
- Institute for Advanced Interdisciplinary Research, University of Jinan, Jinan, Shandong, 250022, China.
| | - Aizhu Wang
- Institute for Advanced Interdisciplinary Research, University of Jinan, Jinan, Shandong, 250022, China.
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