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    Magnetic domain structure and domain-wall bound states of the topological semimetal EuB6

    Qiang Li1,2,*, Haiyang Ma3,4,*, Xin Zhang3, Yanfeng Guo3,4, Jianpeng Liu3,4, Wenbo Wang3,4,†, Xiaodong Zhou1,7,8,‡, and Jian Shen1,2,5,6,7,8,§

    • 1State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
    • 2Department of Physics, Fudan University, Shanghai 200433, China
    • 3School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
    • 4ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai 201210, China
    • 5Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
    • 6Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
    • 7Shanghai Qi Zhi Institute, Shanghai 200232, China
    • 8Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai 201210, China

    • *These authors contributed equally to this work.
    • †wangwb1@shanghaitech.edu.cn
    • ‡zhouxd@fudan.edu.cn
    • §shenj5494@fudan.edu.cn
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    Phys. Rev. B 106, 235108 – Published 6 December, 2022

    DOI: https://doi.org/10.1103/PhysRevB.106.235108

    Abstract

    Electrically manipulating domain wall (DW) is central in the field of spintronics. Magnetic Weyl semimetal (WSM) offers an additional knob for electric manipulation of DW by utilizing the topological DW bound states. Using magnetic WSM material EuB6 as a prototype system, we investigate its DW bound states combining first-principles calculations and domain imaging via magnetic force microscopy (MFM). The MFM measurements reveal that domains with magnetization aligned along three [100] directions dominate over others under a small magnetic field along the [001] direction. Accordingly, first-principles calculations are performed based on experimentally determined DW type, which show a robust DW bound state featuring a spectral distribution over a large portion of the DW Brillouin zone. Such DW bound states should result in a significant amount of localized charges which can be used to drive DW motion via the electrostatic forces exerted on the localized DW charges.

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    Phys. Rev. B 106, 235108– Published 6 December, 2022
    • Received 8 August 2022
    • Accepted 21 November 2022
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