Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 64: Poster Session: Transport
TT 64.5: Poster
Donnerstag, 4. April 2019, 15:00–18:30, Poster D
Control of the critical temperature of Nb by spin-helix reorientation in the chiral magnet MnSi — •Julius Grefe, Bastian Rubrecht, Nico Steinki, David Schroeter, Stefan Süllow, and Dirk Menzel — Institut für Physik der Kondensierten Materie, Technische Universität Braunschweig
Theory has predicted the possibility to control the critical temperature TC of a superconductor via a proximity effect with a non-collinear magnet. The chiral magnet MnSi as a representative of the cubic B20 structure shows such a magnetic behavior below TN = 29.5 K and BC1 = 100 mT. To examine this prediction, Nb (TC = 9.2 K) thin films have been deposited by molecular beam epitaxy on (111)-oriented MnSi monocrystalline substrates grown by the Chochralski process. The dependence of the critical temperature of Nb on the orientation of the spin helices in MnSi switched by an external magnetic field has been investigated. The critical temperature of the superconducting Nb films has been determined by four-point resistance and SQUID susceptibility measurements. For comparison, diamagnetic CoSi substrates have been used as reference samples. This proximity effect can be used for switching a superconducting spin valve consisting only of a single magnetic layer.