Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity: Poster Session
TT 30.16: Poster
Donnerstag, 8. September 2022, 15:00–18:00, P1
Orientation-dependent magnetoresistance of Nb/MnSi heterostructures — •Philip Schröder1, Julius Grefe1, Stefan Süllow1, and Dirk Menzel1,2 — 1Institut für Physik der Kondensierten Materie, TU Braunschweig, Germany — 2Laboratory for Emerging Nanometrology, TU Braunschweig, Germany
During high-resolution four probe (magneto-)resistivity measurements the reliability of the data strongly depends on the contacts’ characteristics. If a vector magnet is not available the change of the sample orientation with respect to the field always requires demounting, reorientation and recontacting of the sample. We have measured the resistivity of a superconducting Nb thin film deposited on a helimagnetic MnSi substrate as function of the angle between the surface and the external magnetic field. In order to maintain the same four-probe configuration without recontacting an experimental setup has been developed allowing 720∘ sample rotation in a homogeneous field up to 1.1 T. The setup is used to accurately investigate the shift due to the proximity effect of the critical temperature Tc of the Nb film in contact to a magnetic system exhibiting a non-collinear spin structure. We show that the spin-helix orientation of the MnSi substrate is able to tune the Tc of Nb so that this heterostructure can be used as a two-component superconducting spin valve.