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Spin-wave contributions to current-induced domain wall dynamics

机译：自旋波对电流感应畴壁动力学的贡献

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摘要

We examine theoretically the role of spin waves on current-induced domain wall dynamics in a ferromagnetic wire. At room temperature, we find that an interaction between the domain wall and the spin waves appears when there is a finite difference between the domain wall velocity x_0 and the spin current u. Three important consequences of this interaction are found. First, spin-wave emission leads to a Landau-type damping of the current-induced domain wall motion toward restoring the solution x_0=u, where spin angular momentum is perfectly transferred from the conduction electrons to the domain wall. Second, the interaction leads to a modification of the domain wall width and mass, proportional to the kinetic energy of the domain wall. Third, the coupling by the electrical current between the domain wall and the spin waves leads to temperature-dependent effective wall mass.
机译：我们从理论上检查了自旋波在铁磁导线中电流感应畴壁动力学上的作用。在室温下，我们发现，当畴壁速度x_0和自旋电流u之间存在有限差异时，畴壁和自旋波之间就会发生相互作用。发现这种相互作用的三个重要结果。首先，自旋波发射导致电流感应的畴壁运动朝向恢复解x_0 = u的Landau型阻尼，其中自旋角动量完美地从传导电子传递到畴壁。第二，相互作用导致畴壁宽度和质量的改变，与畴壁的动能成比例。第三，畴壁和自旋波之间的电流耦合导致取决于温度的有效壁质量。

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