Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 51: Superconductivity: Tunneling, Josephson Junctions, SQUIDs

TT 51.1: Vortrag

Mittwoch, 9. März 2016, 15:00–15:15, H19

Investigation of niobium structures for micro-SQUIDs — •Sandra Gottwals¹, Frank Heyroth², and Georg Schmidt^{1, 2} — ¹Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Germany — ²Interdisziplinäres Zentrum für Materialwissenschaften, MLU Halle-Wittenberg, Germany

In the presence of the Spin-Nernst-Effect a temperature gradient generates spin accumulations in a metal film. The magnetic moment of these accumulations causes a magnetic field. We intend to measure these low magnetic fields using Nb-based micro-SQUIDs. Superconducting Niobium layers are deposited by e-beam evaporation and protected by capping layers either from Ru or Si. The Niobium layers are patterned by e-beam lithography. We have fabricated test stripes with different width varying from 1000 nm to 20 nm. We will present structural and electrical characterization of Nb stripes patterned by different etching processes. Most of the structures show Ohmic behavior at room temperature. At low temperature a transition to the superconducting state is observed with a transition temperature depending on layer thickness and structures size.