Spin-charge interconversion in ferromagnets has recently drawn great attention due to its ability to generate spin current via the anomalous Hall, planar Hall, or intrinsic spin Hall effect. In this work, we demonstrate the magnetization switching of perpendicular anisotropy ferromagnets by the transversely polarized spin current generated from an easy-plane ferromagnet such as $(\mathrm{Fe},\mathrm{Mn})\mathrm{Pt}$ and $(\mathrm{Co},\mathrm{Fe})\mathrm{B}$. The spin-torque efficiency is characterized to be about 21% of that of the same structure with the easy-plane ferromagnet replaced by $\mathrm{Ta}$. In addition, we find that the magnetization switching consists of multiple intermediate states, which can be robustly set by the applied current pulse amplitude and repetition number. This behavior can be used to mimic synaptic devices that is potentially useful for neuromorphic computing.

中文翻译：

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来自铁磁层的自旋电流驱动的多态磁化开关

铁磁体中的自旋电荷互变最近因其能够通过异常霍尔，平面霍尔或固有自旋霍尔效应产生自旋电流而备受关注。在这项工作中，我们演示了由诸如易平面铁磁的横向极化自旋电流产生的垂直各向异性铁磁的磁化转换$（铁，锰）铂$ 和 $（\mathrm{有限公司}，铁）\mathrm{乙}$。自旋转矩效率的特征是用易平面铁磁体替换为相同结构的自旋转矩效率的大约21％$钽$。此外，我们发现磁化切换由多个中间状态组成，可以通过施加的电流脉冲幅度和重复次数来稳健地设置这些状态。此行为可用于模拟可能对神经形态计算有用的突触设备。