论文标题
由于自诱导的自旋轨道扭矩
Anomalous sign inversion of spin-orbit torque in ferromagnetic/nonmagnetic bilayer systems due to self-induced spin-orbit torque
论文作者
论文摘要
当估计相邻非磁性（NM）层的旋转厅角（SHA）时，在铁磁（FM）层中的自旋旋转轨道（SI-SOT）被忽略了。在这项工作中，我们观察到由于SI-SOT增强而导致的自旋刺激性铁磁共振的总SOT的异常符号反转，并通过理论计算成功地合理化了符号反转，考虑到NM和FM层中的SHE。研究结果表明，使用FM层的SHA符号与NM相同的FM层在SI-SOT的帮助下实现了有效的SOT-MAGNETIZED SWITCT。 SI-SOT的贡献对于弱导电NM层而变得显着，并且不认为SI-SOT的常规分析可以高估NM层的SHA，超过150倍。
Self-induced spin-orbit torques (SI-SOTs) in ferromagnetic (FM) layers have been overlooked when estimating the spin Hall angle (SHA) of adjacent nonmagnetic (NM) layers. In this work, we observe anomalous sign inversion of the total SOT in the spin-torque ferromagnetic resonance due to the enhanced SI-SOT, and successfully rationalize the sign inversion through a theoretical calculation considering the SHE in both the NM and FM layers. The findings show that using an FM layer whose SHA sign is the same as that of the NM achieves efficient SOT-magnetization switching with the assistance of the SI-SOT. The contribution of the SI-SOT becomes salient for a weakly conductive NM layer, and conventional analyses that do not consider the SI-SOT can overestimate the SHA of the NM layer by a factor of more than 150.
