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Interaction between superconducting vortices and Bloch wall in ferrite garnet film

J. I. Vestgarden, D. V. Shantsev, A. A. F. Olsen, Y. M. Galperin, V. V. Yurchenko, P. E. Goa, T. H. Johansen

cond-mat.supr-conarXiv:cond-mat/0607043

Abstract

Interaction between a Bloch wall in a ferrite-garnet film and a vortex in a superconductor is analyzed in the London approximation. Equilibrium distribution of vortices formed around the Bloch wall is calculated. The results agree quantitatively with magneto-optical experiment where an in-plane magnetized ferrite-garnet film placed on top of NbSe2 superconductor allows observation of individual vortices. In particular, our model can reproduce a counter-intuitive attraction observed between vortices and a Bloch wall having the opposite polarity. It is explained by magnetic charges appearing due to discontinuity of the in-plane magnetization across the wall.

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