Nonadiabatic Spin Torque Investigated Using Thermally Activated Magnetic Domain Wall Dynamics
Nonadiabatic Spin Torque Investigated Using Thermally Activated Magnetic Domain Wall Dynamics
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DOI：
10.1103/physrevlett.105.056601
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发表时间：
2010-07-29
影响因子：
8.6
通讯作者：
Duine, R. A.
中科院分区：
文献类型：
--
作者：
Eltschka, M.;Woetzel, M.;Duine, R. A.
利用透射电子显微镜，我们研究了室温下坡莫合金（Ni（80）Fe（20））纳米线中两个位置之间畴壁（DW）的热激活运动。我们表明，这种纯粹的热运动是很好地描述了阿罗修斯定律，允许描述的DW作为一个准粒子在一维潜在的景观。通过注入小电流，电势被修改，允许确定非绝热自旋力矩：对于横向DW，beta（t）= 0.010 +/- 0.004;对于涡旋DW，beta（v）= 0.073 +/- 0.026。较大的值归因于存在较高的磁化梯度。
Using transmission electron microscopy, we investigate the thermally activated motion of domain walls (DWs) between two positions in Permalloy (Ni(80)Fe(20)) nanowires at room temperature. We show that this purely thermal motion is well described by an Arrhenius law, allowing for a description of the DW as a quasiparticle in a one-dimensional potential landscape. By injecting small currents, the potential is modified, allowing for the determination of the nonadiabatic spin torque: beta(t) = 0.010 +/- 0.004 for a transverse DW and beta(v) = 0.073 +/- 0.026 for a vortex DW. The larger value is attributed to the higher magnetization gradients present.