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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
- 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.
- Subjects :
- Permalloy
thin film
General Physics and Astronomy
FILMS
01 natural sciences
010305 fluids & plasmas
superconductor
Condensed Matter::Superconductivity
0103 physical sciences
THICKNESS
ddc:530
Thin film
FIELD
010306 general physics
Anisotropy
Superconductivity
Physics
Condensed matter physics
XMCD
Bilayer
superconductivity
Isotropy
ferromagnet bilayer
Chemistry
Ferromagnetism
Physics and Astronomy
Electromagnetic shielding
ferromagnet
Subjects
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