Spin currents and domain wall dynamics based on the spin Seebeck effect

基于自旋塞贝克效应的自旋电流和畴壁动力学

• 批准号: 198571487
• 负责人: Professor Dr. Mathias Kläui
• 金额: --
• 依托单位: Arbeitsgruppe Theorie magnetischer Materialien
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/198571487?language=en
• 关键词: Spin; currents; domain; wall; dynamics

The recently found spin Seebeck effect refers to a spin current and spin accumulation induced by a temperature gradient in a ferromagnetic material. This effect opens new perspectives for spin caloritronic applications, combining the spin degrees of freedom with caloric properties. In a joint theoretical and experimental effort the applicants will investigate spin currents in ferromagnets, induced by thermal gradients. We will use spin model simulations as well as a state-of-the-art micromagnetic framework, which includes thermodynamic aspects, and compare the simulation results with their experimental counterpart. Localized laser (pulse) heating applied to magnetic nano- and microstructures will be used to tailor the temperature gradients. To detect a spin accumulation, we will use the inverse spin Hall effect and engineer the structures to determine its sign, position and origin. In a next step we will investigate the inuence of the thermal spin currents on confined domain walls by simulating and measuring the depinning and propagation properties of the walls. Objectives include a deeper understanding of the origin and the nature of the thermally induced spin currents and a determination of the torques that these spin currents exert on the domain walls.

最近发现的自旋Seebeck效应指的是铁磁材料中由温度梯度引起的自旋流和自旋积累。这种效应为自旋热电子学的应用开辟了新的前景，将自旋自由度与热学性质结合在一起。在一项理论和实验的联合工作中，申请者将研究由温度梯度感应的铁磁体中的自旋电流。我们将使用自旋模型模拟以及最先进的微磁框架，其中包括热力学方面的内容，并将模拟结果与实验对应的结果进行比较。应用于磁性纳米和微结构的局部激光(脉冲)加热将被用来定制温度梯度。为了探测自旋积累，我们将使用逆自旋霍尔效应，并设计结构来确定它的符号、位置和起源。在下一步中，我们将通过模拟和测量限制域壁的脱钉和传播特性来研究热自旋流对限制域壁的影响。目标包括更深入地了解热致自旋电流的来源和性质，以及确定这些自旋电流施加在磁畴壁上的扭矩。