Fachbereich Physik, Universität Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany.
Phys Rev Lett. 2010 Jul 30;105(5):056601. doi: 10.1103/PhysRevLett.105.056601. Epub 2010 Jul 29.
Using transmission electron microscopy, we investigate the thermally activated motion of domain walls (DWs) between two positions in Permalloy (Ni80Fe20) 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: βt=0.010±0.004 for a transverse DW and βv=0.073±0.026 for a vortex DW. The larger value is attributed to the higher magnetization gradients present.
利用透射电子显微镜，我们在室温下研究了坡莫合金（Ni80Fe20）纳米线中两个位置之间的畴壁（DW）的热激活运动。我们表明，这种纯粹的热运动很好地符合阿仑尼乌斯定律，允许将 DW 描述为一维势景观中的准粒子。通过注入小电流，可以修改势，从而确定非绝热自旋扭矩：对于横向 DW，βt=0.010±0.004；对于涡旋 DW，βv=0.073±0.026。较大的值归因于存在更高的磁化强度梯度。
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