中国物理B ›› 2024, Vol. 33 ›› Issue (9): 97508-097508.doi: 10.1088/1674-1056/ad6a0e

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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. 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
  • 收稿日期:2024-07-09 修回日期:2024-07-30 发布日期:2024-08-22
  • 通讯作者: Long You, Hongxin Yang E-mail:lyou@hust.edu.cn;hongxin.yang@zju.edu.cn
  • 基金资助:
    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).

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. 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
  • Received:2024-07-09 Revised:2024-07-30 Published:2024-08-22
  • Contact: Long You, Hongxin Yang E-mail:lyou@hust.edu.cn;hongxin.yang@zju.edu.cn
  • Supported by:
    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).

摘要: 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.

关键词: Dzyaloshinskii-Moriya interaction, field-free, topological magnetism

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.

Key words: Dzyaloshinskii-Moriya interaction, field-free, topological magnetism

中图分类号:  (Intrinsic properties of magnetically ordered materials)

  • 75.30.-m
75.78.Cd (Micromagnetic simulations ?) 12.39.Dc (Skyrmions) 67.80.dk (Magnetic properties, phases, and NMR)