Influence of thermal gradients and spin currents on current driven domain wall motion

我们研究了温度梯度和/或自旋波应用对降低移动磁畴壁所需的阈值电流密度或增加壁速度的影响。利用焦耳加热局部加热导体，我们开发了一个温度梯度为0.2K/5 um的系统。自旋波激发及其检测采用高频电测量。同时，我们发现在接近铁磁共振频率的局域微波场作用下，畴壁成核场减小。然而，场驱动的畴壁速度对传播自旋波的应用几乎没有依赖性。

We have studied the effect of temperature gradient and/or spin wave application to reduce the threshold current density needed to move a magnetic domain wall, or to increase the wall velocity. Using joule heating to locally heat a conductor, we developed a system that has temperature gradient of 0.2K/5 um. Spin wave excitations and its detection was carried out using high frequency electrical measurements. Incidentally, we find that the domain wall nucleation field was reduced when a localized microwave field, near to the ferromagnetic resonance frequency, was applied. However, the field driven domain wall velocity showed little dependence on the application of the propagating spin waves.