Anomalous interaction between vortices and nanomagnets

TL;DR

This paper investigates how vortices in a superconducting film interact with nanomagnets in a magnetic film, revealing a distance-dependent switch from attraction to repulsion influenced by planar anisotropy.

Contribution

It uncovers the anomalous interaction behavior between vortices and nanomagnets in a coupled superconducting-magnetic thin film system, highlighting the role of planar anisotropy.

Findings

Vortex induces a magnetization distribution in the magnetic film.

Interaction between vortex and nanomagnet switches from attractive to repulsive at short distances.

Planar anisotropy influences the nature of vortex-magnet interactions.

Abstract

We study a thin film system consisting of a superconducting and a magnetic film, where the superconductor contains a vortex and the magnetic film a nanomagnet. We find that if the magnetic film has planar anisotropy, the vortex induces a magnetization distribution, and its interaction with the nanomagnet crosses over from attractive to repulsive at short distances.