Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 25: Superconductivity: Heterostructures, Andreev Scattering, Proximity Effect, Coexistence

TT 25.6: Talk

Wednesday, February 27, 2008, 15:15–15:30, H 3010

Inhomogeneous vortex distribution and magnetic coupling in oxide superconductor-ferromagnet hybrids — •Joachim Albrecht^1,2, Märit Djupmyr¹, Soltan Soltan³, Hanns-Ulrich Habermeier³, Malcolm Connolly², and Simon Bending² — ¹MPI für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart — ²Department of Physics, University of Bath, Bath BA2 7AY, UK — ³MPI für Festkörperforschung, Heisenbergstr.1, 70569 Stuttgart

Hybrid systems of thin films of oxide ferromagnets and high-temperature superconductors have been investigated by Scanning Hall Probe Microscopy to analyze the local magnetic flux density distribution at low temperatures [1]. In addition to the intrinsic properties of the films themselves such structures exhibit novel phenomena due to complex interactions arising at the interface between them. As a consequence the distribution of vortices in the superconductor is strongly influenced by the magnetic background arising from the ferromagnet. The local magnetic information obtained from Scanning Hall Probe Microscopy images provides clear evidence for the presence of a magnetic dipolar interaction between the magnetic domains of the ferromagnetic component and the vortex ensemble in the superconductor.

[1] J Albrecht et al., New Journal of Physics 9, 379 (2007)