Spin-dependent thermo-galvanic effects: experiment

直到最近才清楚地认识到，人们早就知道的热电现象需要重新考虑，包括自旋自由度。此外，已经认识到自旋输运中的热效应可以改变热输运、磁阻甚至可能改变磁态。因此，他们的调查，理解和开发是至关重要的，无论是从基本的角度来看，并考虑到基于自旋的设备将用于信息处理的事实。本提案旨在研究铁磁薄膜中的自旋热输运现象以及多层器件中跨界面的自旋热输运现象，这是优先计划1538的核心。这包括制作适合自旋热输运实验需要的外延磁性薄膜和异质结构，磁化方向依赖的塞贝克效应（磁-塞贝克张量）的研究，莫特关系和反常能思特效应的研究，以及由温度梯度引起的自旋电流的定量研究。一个特殊的长期目标包括测量磁热导张量或磁珀耳帖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.