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TT: Fachverband Tiefe Temperaturen
TT 53: Superconductivity: Vortex Physics
TT 53.1: Vortrag
Mittwoch, 18. März 2015, 09:30–09:45, H 3005
High-resolution dichroic imaging of magnetic flux distributions in superconductors with scanning x-ray microscopy — •Stephen Ruoß1, Claudia Stahl1, Markus Weigand1, Gisela Schütz1, and Joachim Albrecht2 — 1Max-Planck-Institut für Intelligente Systeme, Heisenbergstraße 3, 70569 Stuttgart — 2Research Institute for Innovative Surfaces, FINO, Aalen University, Beethovenstraße 1, 73430 Aalen
The penetration of magnetic flux into the high-temperature superconductor YBCO has been observed using a new high-resolution technique based on x-ray magnetic circular dichroism (XMCD). Superconductors coated with thin soft magnetic layers of CoFeB are observed in a scanning x-ray microscope providing cooling of the sample down to 83K under the influence of external magnetic fields. Resulting electrical currents create an inhomogeneous magnetic field distribution above the superconductor which leads to a local reorientation of the ferromagnetic layer [1]. X-ray absorption measurements with circular polarized radiation allows the analysis of the magnetic flux distribution in the superconductor via the ferromagnetic layer [2]. In this work we present first images taken at 83K with high spatial resolution in the nanoscale [3].
[1] C. Stahl et al., EPL 106, 27002 (2014).
[2] C. Stahl et al., Phys. Rev. B 90, 104515 (2014).
[3] S. Ruoß et al., Appl. Phys. Lett., (submitted).