低对称性范德华半金属ZrTe $_\textbf{3}$自旋-轨道力矩的铁磁共振测量
Separation of Artifacts from Spin-Torque Ferromagnetic Resonance Measurements of Spin-Orbit Torque for the Low-Symmetry van der Waals Semi-Metal ZrTe$_\textbf{3}$
摘要：
我们测量的自旋-轨道扭矩所产生的剥离层的低对称性半金属ZrTe $_3$使用自旋扭矩铁磁共振（ST-FMR）技术。当ZrTe $_3$具有大于约10 nm的厚度时，由于自旋泵浦和/或共振加热引起的伪影可导致标准ST-FMR分析将转矩效率的真实大小高估多达30倍，并且不正确地指示自旋-轨道转矩强烈地依赖于ZrTe $_3$层厚度。通过最近开发的检测霍尔几何结构以及纵向几何结构中的ST-FMR信号的方法，仍然可以在相当大的厚度范围内实现无伪影测量。ZrTe $_3$ /坡莫合金样品产生常规的面内抗阻尼自旋扭矩效率$ξ_{||}^{\text{DL}}$ = 0.014 $\pm$ 0.004，以及非常规的面内类场扭矩效率$|ξ_{||}^{\text{FL}}|$ = 0.003 $\pm$ 0.001。面外反阻尼力矩可以忽略不计。我们认为，文物同样干扰标准ST-FMR分析的其他范德瓦尔斯样品厚约10 nm。
英文摘要：
We measure spin-orbit torque generated by exfoliated layers of the low-symmetry semi-metal ZrTe$_3$ using the spin-torque ferromagnetic resonance (ST-FMR) technique. When the ZrTe$_3$ has a thickness greater than about 10 nm, artifacts due to spin pumping and/or resonant heating can cause the standard ST-FMR analysis to overestimate the true magnitude of the torque efficiency by as much as a factor of 30, and to indicate incorrectly that the spin-orbit torque depends strongly on the ZrTe$_3$ layer thickness. Artifact-free measurements can still be achieved over a substantial thickness range by the method developed recently to detect ST-FMR signals in the Hall geometry as well as the longitudinal geometry. ZrTe$_3$/Permalloy samples generate a conventional in-plane anti-damping spin torque efficiency $ξ_{||}^{\text{DL}}$ = 0.014 $\pm$ 0.004, and an unconventional in-plane field-like torque efficiency $|ξ_{||}^{\text{FL}}|$ = 0.003 $\pm$ 0.001. The out-of-plane anti-damping torque is negligible. We suggest that artifacts similarly interfere with the standard ST-FMR analysis for other van der Waals samples thicker than about 10 nm.
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