Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 63: Spincaloric Transport (joint session MA, TT, organized by MA)
TT 63.8: Vortrag
Donnerstag, 23. März 2017, 11:30–11:45, HSZ 403
Quantitative separation of the anisotropic magnetothermopower and planar Nernst effect by the rotation of an in-plane thermal gradient — •Oliver Reimer1, Daniel Meier1, Michel Bovender1, Lars Helmich1, Jan-Oliver Dreessen1, Jan Krieft1, Jan-Michael Schmalhorst1, Andreas Hueutten1, Guenter Reiss1, and Timo Kuschel1,2 — 1CSMD, Physics Department, Bielefeld University, Germany — 2University of Groningen, The Netherlands
A ferromagnet exposed to a thermal gradient ∇ T in an external magnetic field H→ generates a spin current parallel to ∇ T (longitudinal spin Seebeck effect [1]) which can be detected in materials with high spin orbit coupling (e.g. Pt) by the inverse spin Hall effect. Up to now, all spin caloric experiments employ a spatially fixed ∇ T. The use of a recently reported new experimental setup allows the rotation of an in-plane ∇ T [2]. In this talk, it will be shown, that combined with a rotatable external magnetic field, the rotation of ∇ T reveals a phase shift of the magnetothermopower angular dependence with respect to the magnetization direction in a permalloy thin film. Supported by a theoretical model this phase shift allows to unambiguously separate the Seebeck voltage, the anisotropic magnetothermopower and the planar Nernst effect within one experiment.
[1] K. Uchida et al., Appl. Phys. Lett. 97, 172505 (2010)
[2] O. Reimer et al., arXiv: 1609.08822 (2016)