Influence of the magnetic proximity effect on spin-orbit torque efficiencies in ferromagnet/platinum bilayers
Influence of the magnetic proximity effect on spin-orbit torque efficiencies in ferromagnet/platinum bilayers
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DOI：
10.1103/physrevb.97.020403
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发表时间：
2017-11
影响因子：
3.7
通讯作者：
T. Peterson;A. McFadden;C. Palmstrøm;P. Crowell
中科院分区：
文献类型：
--
作者：
T. Peterson;A. McFadden;C. Palmstrøm;P. Crowell
用磁阻谐响应法研究了Co$2$FeAl/Pt超薄双层膜的电流诱导自旋轨道扭矩，区分了类阻尼和类场贡献。通过反常霍尔磁阻和各向异性磁阻观察到随温度变化的磁邻近效应的存在，这些磁阻在温度较低时会随着铂厚度的增加而增强。对于所研究的所有铂厚度，类场扭矩效率随着温度的降低而稳定下降，我们认为这与磁邻近效应对类场扭矩机制的影响有关。
Current-induced spin-orbit torques in Co$_2$FeAl/Pt ultrathin bilayers are studied using a magnetoresistive harmonic response technique, which distinguishes the dampinglike and fieldlike contributions. The presence of a temperature-dependent magnetic proximity effect is observed through the anomalous Hall and anisotropic magnetoresistances, which are enhanced at low temperatures for thin platinum thicknesses. The fieldlike torque efficiency decreases steadily as the temperature is lowered for all Pt thicknesses studied, which we propose is related to the influence of the magnetic proximity effect on the fieldlike torque mechanism.