Quantitative separation of the anisotropic magnetothermopower and planar Nernst effect by the rotation of an in-plane thermal gradient

• Published in: arXiv.org
• Main Authors: Reimer, Oliver, Meier, Daniel, Bovender, Michel, Helmich, Lars, Jan-Oliver Dreessen, Krieft, Jan, Shestakov, Anatoly S, Back, Christian H, Jan-Michael Schmalhorst, Hütten, Andreas, Reiss, Günter, Kuschel, Timo
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 28.09.2016
• Subjects: Anisotropy; Crystallography; Ferrous alloys; Magnetic alloys; Nernst-Ettingshausen effect; Physics - Materials Science; Physics - Mesoscale and Nanoscale Physics; Rotation; Seebeck effect; Separation; Temperature; Temperature gradients; Thin films
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1609.08822

A thermal gradient as the driving force for spin currents plays a key role in spin caloritronics. In this field the spin Seebeck effect (SSE) is of major interest and was investigated in terms of in-plane thermal gradients inducing perpendicular spin currents (transverse SSE) and out-of-plane thermal gradients generating parallel spin currents (longitudinal SSE). Up to now all spincaloric experiments employ a spatially fixed thermal gradient. Thus anisotropic measurements with respect to well defined crystallographic directions were not possible. Here we introduce a new experiment that allows not only the in-plane rotation of the external magnetic field, but also the rotation of an in-plane thermal gradient controlled by optical temperature detection. As a consequence, the anisotropic magnetothermopower and the planar Nernst effect in a permalloy thin film can be measured simultaneously and reveal a phase shift, that allows the quantitative separation of the thermopower, the anisotropic magnetothermopower and the planar Nernst effect.