Spin-dependent thermo-galvanic effects: experiment

直到最近才清楚的是，需要重新考虑早已为人所知的热电现象，包括自旋自由度。此外，人们已经认识到，自旋输运中的热量效应改变了热输运、磁阻，甚至可能改变了磁性状态。因此，无论是从基本的角度还是考虑到基于自旋的设备将被用于信息处理的事实，对它们的研究、理解和开发都是至关重要的。本提案旨在研究铁磁薄膜中的自旋热量传输现象以及多层器件中的界面，这是优先方案1538的核心内容。这包括根据自旋热输运实验的需要制备外延磁性薄膜和异质结构，研究磁化取向相关的Seebeck效应(磁塞贝克张量)，研究Mott关系和反常能斯特效应，以及定量研究温度梯度引起的自旋电流。一个特殊的长期目标在于测量磁热传导张量或磁帕尔蒂埃效应张量及其与晶体对称性的关系。

It became clear only recently that the long-known thermoelectric phenomena need to be re-considered by including the spin degree of freedom. Moreover, it has been recognized that caloric effects in spin transport modify thermal transport, magneto-resistance and possibly even magnetic states. Therefore, their investigation, understanding, and exploitation is of crucial importance, both from a fundamental point of view and given the fact that spin based devices will be used for information processing. The present proposal aims at the study of spin caloric transport phenomena in in ferromagnetic thin films as well as across interfaces in multilayer devices, which are in the heart of Priority Programme 1538. This includes the fabrication of epitaxial magnetic films and heterostructures tailored to the needs of spin caloric transport experiments, the study of the magnetization orientation-dependent Seebeck effect (magneto-Seebeck tensor), investigations of the Mott relations and of the anomalous Nernst effect, and the quantitative investigation of spin currents induced by temperature gradients. A particular long-term goal consists in the measurement of the magneto-heat conductivity tensor or the magneto-Peltier effect tensor and its relation to crystalline symmetry.