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Magnetically induced anisotropy of flux penetration into strong-pinning superconductor/ferromagnet bilayers
- Source :
- New Journal of Physics, Vol 21, Iss 11, p 113019 (2019)
- Publication Year :
- 2019
- Publisher :
- IOP Publishing, 2019.
-
Abstract
- We studied the impact of soft ferromagnetic permalloy (Py) on the shielding currents in a strong-pinning superconductor—YBa _2 Cu _3 O _7− _δ with Ba _2 Y(Nb/Ta)O _6 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
- Volume :
- 21
- Issue :
- 11
- Database :
- Directory of Open Access Journals
- Journal :
- New Journal of Physics
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.8e397370624482985301b0ed6dd5f80
- Document Type :
- article
- Full Text :
- https://doi.org/10.1088/1367-2630/ab4f56