Published November 1, 2019 | Version v1
Journal article Metadata-only

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

Creators

  • 1. Max-Planck-Institute for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart (Germany)
  • 2. Karlsruhe Institute of Technology, Institute for Technical Physics (ITEP), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen (Germany)
  • 3. Leibniz Institute for Solid State and Materials Research IFW Dresden, Institute for Metallic Materials, Helmholtzstr. 20, D-01069 Dresden (Germany)
  • 4. Ghent University, SCRiPTS, Department of Chemistry, Krijgslaan 281-S3, B-9000 Ghent (Belgium)
  • 5. Research Institute for Innovative Surfaces FINO, Aalen University, Beethovenstr. 1, D-73430 Aalen (Germany)

Description

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. (paper)

Availability note (English)

Available from http://dx.doi.org/10.1088/1367-2630/ab4f56

Additional details

Identifiers

DOI
10.1088/1367-2630/ab4f56;

Publishing Information

Journal Title
New Journal of Physics
Journal Volume
21
Journal Issue
11
Journal Page Range
[7 p.]
ISSN
1367-2630

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
52031166
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
ANISOTROPY; ASPECT RATIO; BARIUM COMPOUNDS; FERROMAGNETIC MATERIALS; MAGNETIC FLUX; MAGNETIC PROPERTIES; MICROSCOPY; NANOSTRUCTURES; PERMALLOY; SHIELDING; SUPERCONDUCTORS; THIN FILMS; YTTRIUM COMPOUNDS
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; ALLOYS; DIMENSIONLESS NUMBERS; FILMS; IRON ALLOYS; MAGNETIC MATERIALS; MATERIALS; NICKEL ALLOYS; PHYSICAL PROPERTIES; TRANSITION ELEMENT ALLOYS; TRANSITION ELEMENT COMPOUNDS