Theoretical conditions for field-free magnetization switching induced by spin-orbit torque and dzyaloshinskii-moriya interaction

作     者：Wang, Min Wang, Zhaohao Zhang, Xueying Zhao, Weisheng 

作者机构：Fert Beijing Research Institute Beihang University Beijing China School of Microelectronics Beihang University Beijing China Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University Beijing China 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2020年

核心收录：

主　　题：Torque 

摘      要：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. Copyright © 2020, The Authors. All rights reserved.