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Coupled domain structures in superconductor/ferromagnet Nb-Fe/garnet bilayers

Abstract : We investigate the magnetic structure in a superconducting Nb and ferromagnetic garnet hybrid film. Direct magneto-optical observations reveal a strong interaction between the superconducting vortices in Nb and the magnetic domains in the garnet, resulting in a unique coupled domain structure. The cooperative motion of vortices and domain walls results in an enhanced pinning and a modified electromagnetic response of the hybrid similar to that in type I superconductors. Application of ac field, routinely used for equilibration of domains, leads to their significant contraction. Our calculations explain this effect by a domain shrinkage instability induced by the vortex annihilation around oscillating domain walls.
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Contributor : Bernadette Bergeret <>
Submitted on : Wednesday, March 7, 2012 - 3:10:34 PM
Last modification on : Wednesday, February 17, 2021 - 3:26:06 PM




V. Vlasko-Vlasov, U. Welp, W. Kwok, D. Rosenmann, H. Claus, et al.. Coupled domain structures in superconductor/ferromagnet Nb-Fe/garnet bilayers. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2010, 82 (10), pp.100502 (1-4). ⟨10.1103/PhysRevB.82.100502⟩. ⟨hal-00677186⟩