Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 47: Superconductivity: Properties and Electronic Structure 2
TT 47.4: Vortrag
Mittwoch, 22. März 2017, 16:00–16:15, HSZ 103
Magnetic Flux Distribution in YBCO Thin Films Investigated via XMCD Microscopy at Low Temperatures — •Julian Simmendinger1, Claudia Stahl1, Stephen Ruoß1, Markus Weigand1, Gisela Schütz1, and Joachim Albrecht2 — 1Max-Planck-Institute for Intelligent Systems, Heisenbergstraße 3, 70569 Stuttgart, Germany — 2Research Institute for Innovative Surfaces, FINO, Aalen University, Beethovenstraße 1, 73430 Aalen
The magnetic flux distribution of high-Tc YBa2Cu3O7−δ (YBCO) thin films exhibits structures within the submicrometer regime. Therefore scanning x-ray microscopy based on the x-ray magnetic circular dichroism effect (XMCD) is our method of choice revealing very high spatial resolution of both surface structure and magnetization distribution [1,2]. Introducing an XMCD sensitive, soft-magnetic CoFeB respectively Py sensor layer wherein the magnetic stray field of the superconductor is mapped [3], the critical current density and its dependency of the defect structure in the YBCO thin films are imaged and analyzed.
The measurements were carried out at the scanning x-ray microscope MAXYMUS at Bessy II, HZB Berlin utilizing a new low temperature setup.
[1] S. Ruoß et al., Appl. Phys. Lett. 106, 022601 (2015).
[2] S. Ruoß et al., New J. Phys. 18, 103044 (2016).
[3] C. Stahl et al., J. Appl. Phys. 117, 17D109 (2015).