Spin-orbit torque in a Ni-Fe single layer
Spin-orbit torque in a Ni-Fe single layer
复制标题
DOI：
10.1103/physrevb.104.094430
复制
发表时间：
2021-09
影响因子：
3.7
通讯作者：
T. Seki;Y. Lau;S. Iihama;K. Takanashi
中科院分区：
文献类型：
--
作者：
T. Seki;Y. Lau;S. Iihama;K. Takanashi
研究了单铁磁层的自激自旋轨道转矩（SOT）。对具有和不具有结构反转对称性的极薄Ni-Fe （permalloy, Py）层进行了自旋转矩铁磁共振（ST-FMR）测量：不对称和对称Py层。对于这两种结构，来自奥斯特场的场状成分都清晰地出现了。另一方面，仅在厚度$\ensuremath{\le}3\phantom{\rule{0.16em}{0ex}}\ mathm {nm}$的非对称Py中观察到类阻尼分量。这种类似阻尼的扭矩是由于Py性质的显著空间变化。我们提出了一个玩具模型来分析自致SOT。
We evaluated the self-induced spin-orbit torque (SOT) in a single ferromagnetic layer. Spin-torque ferromagnetic resonance (ST-FMR) was measured for the very thin Ni-Fe (permalloy, Py) layers with and without structural inversion symmetry: asymmetric and symmetric Py layers. For both structures, the fieldlike component coming from the Oersted field clearly appeared. On the other hand, the dampinglike component was observed only for asymmetric Py with thickness $\ensuremath{\le}3\phantom{\rule{0.16em}{0ex}}\mathrm{nm}$. This dampinglike torque is attributable to the significant spatial change in the properties of Py. We propose a toy model to analyze the self-induced SOT.