Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 28: Cryotechnique: Refrigeration and Thermometry
TT 28.4: Vortrag
Dienstag, 2. April 2019, 12:00–12:15, H23
Measuring temperature gradients with superconducting sensors — •Sandra 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
For the investigation of spin caloric phenomena it is necessary to know the local temperature of the investigated material or even determine local temperature gradients. We intend to investigate the spin Nernst effect [1] in Pt which creates a spin Accumulation from a temperature gradient in a normal metal. Because we want to measure this spin accumulation using micro-SQUIDS [2] it is necessary to create and measure a temperature gradient over a distance of a few micrometer at cryogenic temperatures. The gradient is created by a resistive heater and the temperature gradient is determined using superconducting stripe sensors. The temperature dependence of the critical current in superconductors allows us to calibrate the sensors and to reliably measure the temperature. All structures are fabricated by e-beam lithography and reactive ion etching. We present details of the fabrication process and performance tests of individual sensors and sensor pairs.
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W. Wernsdorfer: Supercond. Sci. Technol. 22 (2009) 064013