论文标题
由自旋轨道扭矩和dzyaloshinskii-moriya相互作用引起的无现场磁化切换的理论条件
Theoretical Conditions for Field-free Magnetization Switching Induced by Spin-orbit Torque and Dzyaloshinskii-Moriya Interaction
论文作者
论文摘要
最近，证明可以通过结合自旋轨道扭矩（SOT）和Dzyaloshinskii-Moriya相互作用（DMI）来实现无场开关。但是，这种机制仅发生在某些条件下尚未得到充分讨论的情况。在这封信中，发现可以将域壁宽度与纳米模块直径的比率用作判断这种机制的标准。研究了不同磁参数的影响，包括交换常数，DMI幅度和类似场的象征等。此外，我们揭示了磁性域壁表面能对亚稳态状态的收缩的重要性。我们的工作为DMI诱导的无场磁化切换提供了实验指南，还为设计基于SOT的内存或逻辑电路的设计提供了新的方法。
Recently, it was demonstrated that field-free switching could be achieved by combining spin-orbit torque (SOT) and Dzyaloshinskii-Moriya interaction (DMI). However, this mechanism only occurs under certain conditions which have not been well discussed. In this letter, it is found that the ratio of domain wall width to diameter of nanodots could be utilized as a criteria for judging this mechanism. Influences of different magnetic parameters are studied, including exchange constant, DMI magnitude and field-like toque, etc. Besides, we reveal the importance of the shrinkage of magnetic domain wall surface energy for metastable states. Our work provides guidelines to the experiments on the DMI-induced field-free magnetization switching, and also offers a new way for the design of SOT-based memory or logic circuits.
