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

自旋转移驱动的纳米磁体动力学的时域和频域研究

• 批准号: 27890237
• 负责人: Dr. Bernd Beschoten
• 金额: --
• 依托单位: II. Physikalisches Institut A - Physik der kondensierten Materie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/27890237?language=en
• 关键词: Time; frequency; domain; investigations; spin

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.

我们提出在频域和时域上研究自旋极化电流在磁性纳米结构中引起的相干进动开关和阻尼现象。样品将通过一种基于下切掩模技术的新型图案化工艺制备。这种方法可以创建大型模板阵列，从而可以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在面内和面外电流配置下的固有特性。我们建议解决相干均匀与非相干非均匀自旋波激励在电流诱导开关中的作用。我们的研究将集中在具有面内和面外各向异性的不对称单层结和双层结的动力学研究。特别是，我们想要探索由脉冲电自旋电流诱导和控制的从非相干到相干自旋波激发的交叉状态。