Spin–orbit torques (SOTs) acting in a Py/Pt/Co tri-layer, where the Py and Co layers are in-plane and perpendicularly magnetized, respectively, are investigated via the ferromagnetic resonance method. The resonance linewidth of the Py layer is clearly modulated by the DC bias current due to the damping-like SOT originated from the spin Hall effect in the Pt. In addition to this, the linewidth modulation efficiency is found to depend on the magnetization polarity of the perpendicularly magnetized Co layer. We conclude that this behavior comes from an additional damping-like SOT originating from the spin–orbit precession effect at the Pt/Co interface.

中文翻译：

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铁磁共振检测Py / Pt / Co三层结构中的自旋轨道进动效应

通过铁磁共振方法研究了在Py / Pt / Co三层中的自旋轨道转矩（SOT），其中Py和Co分别在平面内和垂直磁化。由于源自Pt中自旋霍尔效应的类阻尼SOT，Py层的谐振线宽明显受到DC偏置电流的调制。除此之外，发现线宽调制效率取决于垂直磁化的Co层的磁化极性。我们得出的结论是，这种行为是由于Pt / Co界面上的自旋轨道进动效应引起的额外的类似阻尼的SOT。