Spin orbit torque driven magnetization reversal in CoFeTaB/Pt probed by resonant x-ray reflectivity

Spin orbit torque driven magnetization reversal in CoFeTaB/Pt probed by resonant x-ray reflectivity
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通过共振 X 射线反射率探测 CoFeTaB/Pt 中自旋轨道扭矩驱动的磁化反转

DOI:
10.1103/physrevb.106.094429
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发表时间:
2022
期刊:
影响因子:
3.7
通讯作者:
Burn D
Burn D
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Burn D

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利用共振软x射线反射率和振动样品磁强计来表征CoFeTaB/Pt双层层中场驱动和自旋轨道扭矩驱动的磁化反转。磁化反转发生沿外加磁场方向或垂直于电流流动方向。磁强计结果表明,通过施加电流(场)来降低磁场驱动(电流驱动)的矫顽力,突出了两个外部参数的作用。在当前的开关情况下,用软x射线磁滞回线证明,只有靠近Pt开关界面的层,可能突出磁化Pt的邻近效应的作用。我们展示了垂直于光束的磁化反转如何导致反射强度的磁滞行为,这取决于磁化强度,但与入射光束的圆极化的螺旋度无关。
Resonant soft-x-ray reflectivity and vibrating sample magnetometry have been used to characterize field driven and spin orbit torque driven magnetization reversal in a CoFeTaB/Pt bilayer. Reversal of the magnetization occurs either along the applied field direction or perpendicular to the current flow direction. Magnetometry results show that field driven (current driven) coercivities are reduced by application of a current (field) highlighting the roles played by the two external parameters. In the current switching case, it is demonstrated with soft-x-ray hysteresis loops that only the layers near the interface with Pt switch, possibly highlighting the role of proximity effects of the magnetized Pt. We show how magnetization reversal perpendicular to the beam results in hysteresis behavior in the reflected intensity that is dependent on the magnetization but independent of the helicity of the circular polarization of the incident beam.
RASOR:一种用于软 X 射线反射率和衍射的先进仪器。
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