Domain wall effects in ferromagnet-superconductor structures

TL;DR

This paper explores how the magnetic domain structure in ferromagnet-superconductor heterostructures influences their electrical transport properties, focusing on current distribution and vortex formation.

Contribution

It introduces a calculation method for current distribution induced by Bloch domain walls and identifies the critical magnetization for vortex creation.

Findings

Current distribution is significantly affected by domain wall magnetic fields.

A threshold magnetization level induces vortex formation in the superconductor.

The study provides insights into controlling transport properties via magnetic domain engineering.

Abstract

We investigate how domain structure of the ferromagnet in superconductor-ferromagnet heterostructures may change their transport properties. We calculate the distribution of current in the superconductor induced by magnetic field of Bloch domain walls, find the ``lower critical'' magnetization of the ferromagnet that provides vortices in the superconductor.