Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 38: Magnetocaloric Effects (joint session MA/TT)
TT 38.10: Vortrag
Dienstag, 13. März 2018, 12:00–12:15, EB 407
An experimental design to measure the spin Nernst effect — •Sandra Gottwals1, Thierry Crozes2, and Georg Schmidt1, 3 — 1Martin-Luther-Universität Halle-Wittenberg, Institut für Physik, Fachgruppe Nanostrukturierte Materialien, Halle — 2Institut Néel, CNRS, Grenoble — 3Martin-Luther-Universität Halle-Wittenberg, Interdisziplinäres Zentrum für Materialwissenschaften, Halle
Like the spin Hall effect to the ordinary Hall effect the spin Nernst effect compares to the Nernst effect. A thermal gradient in a material with sufficient spin orbit coupling generates a spin current and spin accumulation perpendicular to the gradient. We are developing a setup to measure the resulting spin accumulation and magnetic moment using micro SQUIDs. The sample design is rather complex because it needs at least two micro SQUIDs to measure the spin accumulation on two opposite sides of a Pt layer together with superconducting stripes to measure the local temperature. On top of these a Pt layer and a heater with the necessary electrical insulation need to be processed. We present the results and current status of our development. On all superconducting structures the critical current needs to be measured simultaneously.