Title: Crossover between different regimes of inhomogeneous superconductivity in planar superconductor-ferromagnet hybrids
Authors: Aladyshkin, Alexei ×
Fritzsche, Joachim
Werner, R
Kramer, Roman
Guenon, S
Kleiner, R
Koelle, D
Moshchalkov, Victor #
Issue Date: Sep-2011
Publisher: Published by the American Physical Society through the American Institute of Physics
Series Title: Physical Review B, Condensed Matter and Materials Physics vol:84 issue:9 pages:1-10
Article number: 094523
Abstract: We studied experimentally the effect of a stripelike domain structure in a ferromagnetic BaFe12O19 substrate on the magnetoresistance of a superconducting Pb microbridge. The system was designed in such a way that the bridge is oriented perpendicular to the domain walls. It is demonstrated that depending on the ratio between the amplitude of the nonuniform magnetic field B-0, induced by the ferromagnet, and the upper critical field H-c2 of the superconducting material, the regions of the reverse-domain superconductivity in the H-T plane can be isolated or can overlap (H is the external magnetic field, T is temperature). The latter case corresponds to the condition B-0/H-c2 < 1 and results in the formation of superconductivity above the magnetic domains of both polarities. We discovered the regime of edge-assisted reverse-domain superconductivity, corresponding to localized superconductivity near the edges of the bridge above the compensated magnetic domains. Direct verification of the formation of inhomogeneous superconducting states and external-field-controlled switching between the normal state and inhomogeneous superconductivity were obtained by low-temperature scanning laser microscopy.
ISSN: 1098-0121
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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