Magnetic screening properties of superconductor-ferromagnet bilayers

TL;DR

This paper theoretically investigates how the magnetic screening in superconductor-ferromagnet bilayers varies with ferromagnet thickness, revealing oscillatory behavior of the effective penetration depth due to proximity effects.

Contribution

It introduces a theoretical model describing the oscillatory magnetic response in superconductor-ferromagnet bilayers based on their thickness and coherence length.

Findings

Effective penetration depth oscillates with ferromagnet thickness.

Oscillations occur on the scale of the ferromagnetic coherence length.

Magnetic response is sensitive to bilayer thickness.

Abstract

We study theoretically the magnetic screening properties of thin, diffusive superconductor/ferromagnet bilayers subject to a perpendicular magnetic field. We find that the effective penetration depth characterizing the magnetic response oscillates with the thickness of the ferromagnetic layer on the scale of the ferromagnetic coherence length.