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Dzyaloshinskii-Moriya interaction and field-free sub-10 nm topological magnetism in Fe/bismuth oxychalcogenides heterostructures |
| Yaoyuan Wang(王垚元)1,2, Long You(游龙)1,3,†, Kai Chang(常凯)2, and Hongxin Yang(杨洪新)2,‡ |
1 School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, China;
2 Center for Quantum Matter, School of Physics, Zhejiang University, Hangzhou 310058, China;
3 Shenzhen Huazhong University of Science and Technology Research Institute, Shenzhen 518000, China |
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Abstract Topological magnetism with strong robustness, nanoscale dimensions and ultralow driving current density ($\sim 10^{6}$ A/m$^{2}$) is promising for applications in information sensing, storage, and processing, and thus sparking widespread research interest. Exploring candidate material systems with nanoscale size and easily tunable properties is a key for realizing practical topological magnetism-based spintronic devices. Here, we propose a class of ultrathin heterostructures, Fe/Bi$_{2}$O$_{2}X$ ($X ={\rm S}$, Se, Te) by deposing metal Fe on quasi-two-dimensional (2D) bismuth oxychalcogenides Bi$_{2}$O$_{2}X$ ($X ={\rm S}$, Se, Te) with excellent ferroelectric/ferroelastic properties. Large Dzyaloshinskii-Moriya interaction (DMI) and topological magnetism can be realized. Our atomistic spin dynamics simulations demonstrate that field-free vortex-antivortex loops and sub-10 nm skyrmions exist in Fe/Bi$_{2}$O$_{2}$S and Fe/Bi$_{2}$O$_{2}$Se interfaces, respectively. These results provide a possible strategy to tailor topological magnetism in ultrathin magnets/2D materials interfaces, which is extremely vital for spintronics applications.
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Received: 09 July 2024
Revised: 30 July 2024
Accepted manuscript online: 01 August 2024
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PACS:
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75.30.-m
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(Intrinsic properties of magnetically ordered materials)
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75.78.Cd
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(Micromagnetic simulations ?)
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12.39.Dc
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(Skyrmions)
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67.80.dk
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(Magnetic properties, phases, and NMR)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2022YFA1405100, 2022YFA1403601, 2020AAA0109005, and 2023YFB4502100), the “Pioneer” and “Leading Goose” R&D Program of Zhejiang Province (Grant No. 2022C01053), the National Natural Science Foundation of China (Grant Nos. 12174405, 12204497, 12327806, and 62074063), and Shenzhen Science and Technology Program (Grant No. JCYJ20220818103410022). |
Corresponding Authors:
Long You, Hongxin Yang
E-mail: lyou@hust.edu.cn;hongxin.yang@zju.edu.cn
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Cite this article:
Yaoyuan Wang(王垚元), Long You(游龙), Kai Chang(常凯), and Hongxin Yang(杨洪新) Dzyaloshinskii-Moriya interaction and field-free sub-10 nm topological magnetism in Fe/bismuth oxychalcogenides heterostructures 2024 Chin. Phys. B 33 097508
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