We report the study of current-induced magnetization switching in the Ta/CoFeB heterostructures by simultaneous magneto-electrical transport and magneto-optical Kerr effect (MOKE) microscopy measurements. Although the anomalous Hall hysteresis loop summarizes the general switching behaviors, the supplementary MOKE data can provide spatial and temporal information to visualize the magnetic domain evolution as functions of the applied current and the in-plane magnetic field. More importantly, when the initial magnetic field is not sufficient enough, the interfacial Dzyaloshinskii-Moriya interaction (DMI) would modulate the spin-orbit torque (SOT) current switching dynamics and lead to the formation of the intermediate Hall resistance plateau with meta-stable tilted domain texture. Our work elucidates the importance of the applied in-plane field and unveils an effective approach to investigate the SOT/DMI-related phenomena in symmetry-breaking magnetic heterostructures.

中文翻译：

---

垂直磁化 Ta/CoFeB 结构中自旋轨道扭矩引起的成像磁化翻转


我们报告了通过同步磁电输运和磁光克尔效应（MOKE）显微镜测量对 Ta/CoFeB 异质结构中电流感应磁化转变的研究。尽管反常霍尔磁滞回线总结了一般的开关行为，但补充 MOKE 数据可以提供空间和时间信息，以将磁域演化可视化为所施加电流和面内磁场的函数。更重要的是，当初始磁场不够充足时，界面Dzyaloshinskii-Moriya相互作用（DMI）将调节自旋轨道扭矩（SOT）电流切换动力学，并导致亚稳态中间霍尔电阻平台的形成倾斜域纹理。我们的工作阐明了应用面内场的重要性，并揭示了一种研究对称破缺磁性异质结构中 SOT/DMI 相关现象的有效方法。