Time- and frequency-domain investigations of spin-transfer-driven nanomagnet dynamics

我们建议研究磁性纳米结构中的相干旋进开关和阻尼现象所引起的自旋极化电流在频域和时域。样品将通过一种基于底切掩模技术的新型图案化工艺制备。这种方法能够创建大型模板阵列，从而快速修改和优化材料组合和生长条件。此外，该方法适用于利用和探测磁性纳米结构的面内和面外电流配置的固有特性。我们建议解决的作用，相干均匀与非相干非均匀自旋波激发电流感应开关。我们的研究将集中在非对称单层结和双层结的面内和面外各向异性的动态研究。特别是，我们要探讨的交叉制度，从非相干相干自旋波激发诱导和控制的脉冲电自旋电流。

We propose to study coherent precessional switching and damping phenomena in magnetic nanostructures as induced by spin-polarized electrical currents in both the frequency- and time-domain. Samples will be prepared by a novel patterning process based on an undercut mask technique. This approach enables to create large arrays of templates, which allow to quickly modify and optimize both material combinations and growth conditions. Furthermore, this method is suitable for utilizing and probing intrinsic properties of magnetic nanostructures for both in-plane and out-of-plane current configurations. We suggest to address the role of coherent uniform vs. incoherent non-uniform spin wave excitations for current-induced switching. Our investigations will focus on dynamic studies in asymmetric single layer junctions and bilayer junctions with both in- and out-of-plane anisotropies. In particular, we want to explore the crossover regime from incoherent to coherent spin wave excitations as induced and controlled by pulsed electrical spin currents.