Optical characterization of nonlocal spin transfer torque acting on a single nanomagnet
Optical characterization of nonlocal spin transfer torque acting on a single nanomagnet
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DOI：
10.1103/physrevb.89.094421
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发表时间：
2014-03-21
影响因子：
3.7
通讯作者：
Hicken, R. J.
中科院分区：
文献类型：
--
作者：
Keatley, P. S.;Aziz, A.;Hicken, R. J.
利用时间分辨扫描克尔显微镜（TRSKM）研究了两端电流平行于平面的非局域自旋阀中非局域自旋转移矩（NL-STT）的影响。奥斯特场和NL-STT的组合用于激励和控制磁化动力学。通过与宏观自旋模型的比较，NL-STT的强度进行了量化，并发现是通过直接注入自旋极化电流实现的。磁光探头的灵敏度小的平面偏转的磁化也允许NL-STT被量化在准直流测量，大大简化了调查的STT现象。
Time-resolved scanning Kerr microscopy (TRSKM) has been used to examine the effect of nonlocal spin transfer torque (NL-STT) within a two-terminal current perpendicular-to-plane nonlocal spin valve. A combination of Oersted field and NL-STT was used to excite and control the magnetization dynamics. By comparison with a macrospin model, the strength of the NL-STT was quantified and found to be comparable to that achieved by direct injection of spin-polarized current. The sensitivity of the magneto-optical probe to small out-of-plane deflections of the magnetization also allows the NL-STT to be quantified in quasi-dc measurements, greatly simplifying the investigation of STT phenomena.