Correlation between magnetic domain structures and quantum anomalous Hall effect in epitaxial MnBi2Te4 thin films

• DOI: 10.48550/arxiv.2401.12544
• Publication Date: 2024-01-01
• Authors: Yang Shi; Yunhe Bai; Yuanzhao Li; Yan Feng; Qiang Li; Huanyu Zhang; Yang Chen; Yitian Tong; Jianli Luan; Ruixuan Liu; Pengfei Ji; Zongwei Gao; Hangwen Guo; Jinsong Zhang; Yayu Wang; Xiao Feng; Ke He; Xiaodong Zhou; Jian Shen
• Keywords: Condensed Matter - Mesoscale and Nanoscale Physics; Mesoscale and Nanoscale Physics (cond-mat.mes-hall); FOS: Physical sciences

We use magnetic force microscopy (MFM) to study spatial uniformity of magnetization epitaxially grown MnBi2Te4 thin films. Compared films which exhibit no quantum anomalous Hall effect (QAH), with QAH are observed have more larger domain size. The evolution upon field sweeping indicates that the domains or nonuniformity originates from strong pinning inherent sample inhomogeneity. A direct correlation between resistivity and size has been established by analyzing a series without QAH. Our observation shows one suppress allow be quantized. fact sizable longitudinal remains even for suggests quantized insulator scenario. work provides important insights understanding quantization mechanism dissipation state in system.