Dzyaloshinskii-Moriya interaction and field-free sub-10 nm topological magnetism in Fe/bismuth oxychalcogenides heterostructures

王垚元 ¹游龙 ²常凯 ³杨洪新³

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作者信息

1. School of Integrated Circuits,Huazhong University of Science and Technology,Wuhan 430074,China;Center for Quantum Matter,School of Physics,Zhejiang University,Hangzhou 310058,China
2. School of Integrated Circuits,Huazhong University of Science and Technology,Wuhan 430074,China;Shenzhen Huazhong University of Science and Technology Research Institute,Shenzhen 518000,China
3. Center for Quantum Matter,School of Physics,Zhejiang University,Hangzhou 310058,China
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Abstract

Topological magnetism with strong robustness,nanoscale dimensions and ultralow driving current density(～106 A/m2)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 re-alizing practical topological magnetism-based spintronic devices.Here,we propose a class of ultrathin heterostructures,Fe/Bi2O2X(X=S,Se,Te)by deposing metal Fe on quasi-two-dimensional(2D)bismuth oxychalcogenides Bi2O2X(X=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/Bi2O2S and Fe/Bi2O2Se 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

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基金项目

National Key Research and Development Program of China(2022YFA1405100)

National Key Research and Development Program of China(2022YFA1403601)

National Key Research and Development Program of China(2020AAA0109005)

National Key Research and Development Program of China(2023YFB4502100)

the"Pioneer"and"Leading Goose"R&D Program of Zhejiang Province(2022C01053)

National Natural Science Foundation of China(12174405)

National Natural Science Foundation of China(12204497)

National Natural Science Foundation of China(12327806)

National Natural Science Foundation of China(62074063)

Shenzhen Science and Technology Program(JCYJ20220818103410022)

出版年

2024

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

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