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Magnetically induced anisotropy of flux penetration into strong-pinning superconductor/ferromagnet bilayers

Magnetically induced anisotropy of flux penetration into strong-pinning superconductor/ferromagnet bilayers

Authors :
Gisela Schütz
Adrian M. Ionescu
I. Van Driessche
Joachim Albrecht
J. Simmendinger
Jens Hänisch
Ruben Hühne
Markus Weigand
Max Sieger
Hannes Rijckaert
M. Bihler
Source :
NEW JOURNAL OF PHYSICS, New journal of physics, 21 (11), 113019
Publication Year :
2019

Abstract

We studied the impact of soft ferromagnetic permalloy (Py) on the shielding currents in a strong-pinning superconductor—YBa2Cu3O7−δ with Ba2Y(Nb/Ta)O6 nano-precipitates—by means of scanning transmission x-ray microscopy. Typically and in particular when in the thin film limit, superconductor/ferromagnet (SC/FM) bilayers exhibit isotropic properties of the flux line ensemble at all temperatures. However, in elements with small aspect ratio a significant anisotropy in flux penetration is observed. We explain this effect by local in-plane fields arising from anisotropic magnetic stray fields originated by the ferromagnet. This leads to direction-dependent motion of magnetic vortices inside the SC/FM bilayer. Our results demonstrate that small variations of the magnetic properties can have huge impact on the superconductor.

Details

Language :
English
ISSN :
13672630
Database :
OpenAIRE
Journal :
NEW JOURNAL OF PHYSICS, New journal of physics, 21 (11), 113019
Accession number :
edsair.doi.dedup.....5c58a9d601607f334dd147fb1dc09806