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TT: Fachverband Tiefe Temperaturen
TT 19: Superconductivity: Poster Session
TT 19.28: Poster
Monday, March 7, 2016, 15:00–18:00, Poster D
Magneto-optical Kerr-effect at low temperatures: Investigation of superconductor/ferromagnet heterostructures — •Patrick Zahn1,2, Claudia Stahl1, Stephen Ruoß1, Joachim Gräfe1, Jonas Bayer1,2, Gisela Schütz1, and Joachim Albrecht2 — 1Max Planck Institute for Intelligent Systems, Heisenbergstraße 3, 70569 Stuttgart, Germany — 2Institute for Innovative Surfaces FINO, Aalen University, Beethovenstraße 1, 73430 Aalen, Germany
With XMCD microscopy it is possible to visualize the critical current density of the superconductor YBCO with high spatial resolution [1,2]. Therefore, soft magnetic CoFeB is introduced as sensor layer. The magnetic stray fields of the supercurrents lead to a local reorientation of the magnetic moments in the ferromagnet, which are then imaged via X-ray microscopy. These experiments have to be carried out at the scanning x-ray microscope MAXYMUS at the synchrotron Bessy II in Berlin. For that purpose pre-characterization of the sensor is highly desirable:
Magnetic interactions between the superconductor and the ferromagnetic sensor layer have been investigated at low temperatures using Kerr-effect measurements. Therefore hysteresis loops are obtained by a sophisticated magnet and field ramping setup within the NanoMOKE3 system [3]. The results are used to optimize the ferromagnetic sensor layer for XMCD microscopy of superconductors.
C. Stahl et al., PRB 90, 104515 (2014)
S. Ruoß et al., APL 106, 022601 (2015)
J. Gräfe et al., Rev. Sci. Instrum. 85, 023901 (2014)