论文标题
通过厚度依赖性自旋轨道扭矩FMR测量测定自旋轨道扭矩
Determination of spin-orbit torques by thickness-dependent spin-orbit torque FMR measurement
论文作者
论文摘要
通过使用自旋轨道扭矩铁磁共振（SOT-FMR）测量，已经研究了Fe/pt双层中当前诱导的自旋轨道扭矩（SOT）。具有不同厚度的薄膜的表征表明存在与Oersted场诱导的扭矩（Oersted Torque）竞争的相当场状的旋转轨道扭矩。在标准的SOT-FMR方法中忽略了场状扭矩，并且存在强场扭矩的存在使得估计旋转厅角（SHA）有问题。同样，在射频测量中，将类似场的扭矩与Oersted扭矩区分开是一项挑战。基于场状扭矩，抗阻尼扭矩和扭矩的厚度依赖性，提出了依赖厚度的SOT-FMR测量值，作为一种更可靠的，自校准的方法，用于表征自旋轨道的旋转曲奇。
Current induced spin-orbit torques (SOTs) in Fe/Pt bilayers have been investigated utilizing the spin-orbit torque ferromagnetic resonance (SOT-FMR) measurement. Characterization of thin films with different thicknesses indicates existence of a sizable field-like spin-orbit torque competing with the Oersted field induced torque (Oersted torque). The field-like torque is neglected in the standard SOT-FMR method and the presence of a strong field-like torque makes estimation of the spin Hall angle (SHA) problematic. Also, it is challenging to differentiate the field-like torque from the Oersted torque in a radiofrequency measurement. Based on the thickness dependence of field-like torque, anti-damping torque, and Oersted torque, the thickness-dependent SOT-FMR measurement is proposed as a more reliable, self-calibrated approach for characterization of spin-orbit torques.
