A spin-orbit torque switching scheme with collinear magnetic easy axis and current configuration
A spin-orbit torque switching scheme with collinear magnetic easy axis and current configuration
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DOI：
10.1038/nnano.2016.29
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发表时间：
2016-07-01
影响因子：
38.3
通讯作者：
Ohno, H.
中科院分区：
文献类型：
--
作者：
Fukami, S.;Anekawa, T.;Ohno, H.
自旋-轨道力矩是重金属/铁磁体纳米结构中面内电流通过自旋-轨道相互作用产生的力矩，为磁化方向的转换提供了一条新的途径。虽然有许多最近的研究，他们都建立在两个结构，具有位于正交的电流，即沿着z或y轴的纳米磁体的易轴之一。在这里，我们提出了一个新的结构与第三种几何形状，也就是说，与易轴共线的电流（沿着x轴）。我们制作了一个三端设备与Ta/CoFeB/MgO为基础的堆栈和演示的开关操作驱动的自旋轨道扭矩由于Ta与负自旋霍尔角。与不同的几何形状的比较突出了以前未知的自旋轨道转矩切换机制。我们的工作提供了一个新的途径，探索自旋轨道转矩开关的物理和自旋电子器件的应用。
Spin-orbit torque, a torque brought about by in-plane current via the spin-orbit interactions in heavy-metal/ferromagnet nanostructures, provides a new pathway to switch the magnetization direction. Although there are many recent studies, they all build on one of two structures that have the easy axis of a nanomagnet lying orthogonal to the current, that is, along the z or y axes. Here, we present a new structure with the third geometry, that is, with the easy axis collinear with the current (along the x axis). We fabricate a three-terminal device with a Ta/CoFeB/MgO-based stack and demonstrate the switching operation driven by the spin-orbit torque due to Ta with a negative spin Hall angle. Comparisons with different geometries highlight the previously unknown mechanisms of spin-orbit torque switching. Our work offers a new avenue for exploring the physics of spin-orbit torque switching and its application to spintronics devices.