Correlation between magnetic domain structures and quantum anomalous Hall effect in epitaxial MnBi2Te4 thin films
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arXiv
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| Autores principales: | , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Acceso en línea: | |
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| _version_ | 1866910746287276032 |
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| author | Shi, Yang Bai, Yunhe Li, Yuanzhao Feng, Yang Li, Qiang Zhang, Huanyu Chen, Yang Tong, Yitian Luan, Jianli Liu, Ruixuan Ji, Pengfei Gao, Zongwei Guo, Hangwen Zhang, Jinsong Wang, Yayu Feng, Xiao He, Ke Zhou, Xiaodong Shen, Jian |
| author_facet | Shi, Yang Bai, Yunhe Li, Yuanzhao Feng, Yang Li, Qiang Zhang, Huanyu Chen, Yang Tong, Yitian Luan, Jianli Liu, Ruixuan Ji, Pengfei Gao, Zongwei Guo, Hangwen Zhang, Jinsong Wang, Yayu Feng, Xiao He, Ke Zhou, Xiaodong Shen, Jian |
| contents | We use magnetic force microscopy (MFM) to study spatial uniformity of magnetization of epitaxially grown MnBi2Te4 thin films. Compared to films which exhibit no quantum anomalous Hall effect (QAH), films with QAH are observed to have more spatial uniformity of magnetization with larger domain size. The domain evolution upon magnetic field sweeping indicates that the magnetic domains or the spatial nonuniformity of magnetization originates from the strong pinning of the inherent sample inhomogeneity. A direct correlation between the Hall resistivity and the domain size has been established by analyzing a series of thin films with and without QAH. Our observation shows that one has to suppress the spatial nonuniformity of magnetization to allow the Hall resistivity to be quantized. The fact that a sizable longitudinal resistivity remains even for the QAH sample suggests a quantized Hall insulator scenario. Our work provides important insights to the understanding of the quantization mechanism and the dissipation of the QAH state in MnBi2Te4 system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_12544 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Correlation between magnetic domain structures and quantum anomalous Hall effect in epitaxial MnBi2Te4 thin films Shi, Yang Bai, Yunhe Li, Yuanzhao Feng, Yang Li, Qiang Zhang, Huanyu Chen, Yang Tong, Yitian Luan, Jianli Liu, Ruixuan Ji, Pengfei Gao, Zongwei Guo, Hangwen Zhang, Jinsong Wang, Yayu Feng, Xiao He, Ke Zhou, Xiaodong Shen, Jian Mesoscale and Nanoscale Physics We use magnetic force microscopy (MFM) to study spatial uniformity of magnetization of epitaxially grown MnBi2Te4 thin films. Compared to films which exhibit no quantum anomalous Hall effect (QAH), films with QAH are observed to have more spatial uniformity of magnetization with larger domain size. The domain evolution upon magnetic field sweeping indicates that the magnetic domains or the spatial nonuniformity of magnetization originates from the strong pinning of the inherent sample inhomogeneity. A direct correlation between the Hall resistivity and the domain size has been established by analyzing a series of thin films with and without QAH. Our observation shows that one has to suppress the spatial nonuniformity of magnetization to allow the Hall resistivity to be quantized. The fact that a sizable longitudinal resistivity remains even for the QAH sample suggests a quantized Hall insulator scenario. Our work provides important insights to the understanding of the quantization mechanism and the dissipation of the QAH state in MnBi2Te4 system. |
| title | Correlation between magnetic domain structures and quantum anomalous Hall effect in epitaxial MnBi2Te4 thin films |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2401.12544 |