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
TL;DR
This paper models the interaction between superconducting vortices and Bloch walls in ferrite-garnet films, explaining experimental observations including vortex attraction due to magnetic charges.
Contribution
It provides a theoretical analysis of vortex-Bloch wall interactions in ferrite-garnet films using the London approximation, matching experimental results.
Findings
Quantitative agreement with magneto-optical experiments
Reproduction of vortex attraction to Bloch walls with opposite polarity
Explanation of magnetic charge effects causing vortex behavior
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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