Spin-dependent thermo-galvanic effects: Theory

该理论项目通过详细研究各种自旋相关的热电效应，为自旋热电子学领域做出了贡献。基于从头计算电子结构方法对铁磁体中的各向异性Seebeck效应和反常能斯特效应进行了具体的材料计算，以揭示它们与各向异性磁电阻和反常霍尔效应之间的关系。隐式自旋相关效应的工作将继续通过调查自旋塞贝克和自旋能斯特效应，有很大的应用潜力，因为它们直接导致自旋电流。自旋能斯特效应作为自旋霍尔效应的对应物，预期甚至对于非磁性材料也存在。各种类型的能斯特效应的研究的一个中心问题将是不同的输运系数相对于相应的各向同性电导率的标度行为。这给出了信息的主导散射机制负责的外部贡献的能斯特效应。无序合金的调查进行，特别是利用浓度作为一个隐式参数的标度行为的分析。分层系统的相应工作将集中在特定的系统参数的影响。所有工作都将与实验合作伙伴密切合作，以支持他们的活动，并为进一步的发展获得重要的反馈。

The theory project contributes to the field of Spin Caloritronics by detailed investigations on various spin-dependent thermo-galvanic effects. Material specific calculations based on ab-initio electronic structure methods on the anisotropic Seebeck and anomalous Nernst effects in ferromagnets are meant among other things to reveal their relationship to the anisotropic magneto-resistance and anomalous Hall effect being their electronic counterparts. The work on implicitly spin-dependent effects will be continued by investigating the spin Seebeck and spin Nernst effects that have a great potential for applications as they lead directly to spin currents. The spin Nernst effect as the counterpart to the spin Hall effect is expected to exist even for non-magnetic materials. A central issue of the investigations on the various types of the Nernst effect will be the scaling behavior of different transport coefficients with respect to the corresponding isotropic conductivity. This gives information on the dominating scattering mechanisms responsible for the extrinsic contributions to the Nernst effects. Investigations on disordered alloys are performed, in particular, to exploit the concentration as an implicit parameter for an analysis of the scaling behavior. Corresponding work on layered systems will focus on the influence of specific system parameters. All work will be done in close collaboration with experimental partners to support their activities and to get important feedback for further developments.