MnBi2Te4, a two-dimensional magnetic topological insulator with a uniaxial antiferromagnetic structure, is an ideal platform to realize quantum anomalous Hall effect. However, the strength of magnetic interactions is not clear yet. We performed systematic studies on the magnetization and angle dependent magnetotransport of MnBi2Te4 single crystal. The results show that the direction of the magnetic field has significant effects on the critical field values and magnetic structure of this compound, which leads to different magnetotransport behaviors. The field-driven reorientation transitions can be utilized to estimate the AFM interlayer exchange interaction coupling and uniaxial magnetic anisotropy D. The obtained Hamiltonian can well explain the experimental data by Monte Carlo simulations. Our comprehensive studies on the field-driven magnetic transitions phenomenon in MnBi2Te4 provide a general approach for other topological systems with antiferromagnetism.
@article{arxiv.2110.11686,
title = {Angle dependent field-driven reorientation transitions in uniaxial antiferromagnet MnBi$_2$Te$_4$ single crystal},
author = {Ning Cao and Xue Chen and Xinrun Mi and Saisai Qiao and Liyu Zhang and Kunling Peng and Mingquan He and Aifeng Wang and Yisheng Chai and Xiaoyuan Zhou},
journal= {arXiv preprint arXiv:2110.11686},
year = {2022}
}