解决自旋力矩铁磁共振测量中的不确定性：线形与线宽分析
Resolving Discrepancies in Spin-Torque Ferromagnetic Resonance Measurements: Lineshape vs. Linewidth Analyses
摘要：
当使用自旋-转矩铁磁共振（ST-FMR）测量自旋-轨道转矩时，分析结果以提取转矩效率的两种替代方法-线形分析和线宽随直流电流变化的分析-经常给出不一致的结果。我们找出了这些矛盾的根源。我们发现，适合的ST-FMR数据的标准分析框架留下显着的残差，我们确定为由于（i）电流诱导的激励的一个小体积的磁性材料的磁阻尼远远大于大部分的磁性层，我们推测是与重金属/磁铁接口和（ii）振荡的样品磁化在调制频率由于加热。残余信号对直流电流的依赖性可能会干扰线宽方法对自旋扭矩效率的准确提取。我们表明，这两种类型的分析之间的差异可以在很大程度上消除外推的窗口中使用的磁场的线宽适合小的值，以尽量减少残余信号的影响。
英文摘要：
When spin-orbit torques are measured using spin-torque ferromagnetic resonance (ST-FMR), two alternative ways of analyzing the results to extract the torque efficiencies -- lineshape analysis and analysis of the change in linewidth versus DC current -- often give inconsistent results. We identify a source for these inconsistencies. We show that fits of ST-FMR data to the standard analysis framework leave significant residuals that we identify as due to (i) current-induced excitations of a small volume of magnetic material with magnetic damping much larger than the bulk of the magnetic layer, that we speculate is associated with the heavy-metal/magnet interface and (ii) oscillations of the sample magnetization at the modulation frequency due to heating. The dependence of the residual signals on DC current can interfere with an accurate extraction of spin-torque efficiencies by the linewidth method. We show that the discrepancies between the two types of analysis can be largely eliminated by extrapolating the window of magnetic fields used in the linewidth fits to small values so as to minimize the influence of the residual signals.
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