Enhanced triplet Andreev reflection off a domain wall in a lateral geometry

TL;DR

This paper demonstrates that in a lateral geometry, domain walls in a thin film half-metal significantly enhance triplet Andreev reflection, making them effective sources of triplet proximity effects in superconductor-half-metal interfaces.

Contribution

The study reveals that the triplet Andreev reflection is greatly enhanced in thin film half-metals with domain walls, providing a new way to generate triplet proximity effects.

Findings

Triplet Andreev reflection amplitude is enhanced in thin films.

Enhancement factor is proportional to the ratio of domain wall width to film thickness.

Domain walls can serve as effective sources of triplet proximity effects.

Abstract

We find that the triplet Andreev reflection amplitude at the interface between a half-metal and an s-wave superconductor in the presence of a domain wall is significantly enhanced if the half metal is a thin film, rather than an extended magnet. The enhancement is by a factor $l_{\rm d}/d$, where $l_{\rm d}$ is the width of the domain wall and $d$ the film thickness. We conclude that in a lateral geometry, domain walls can be an effective source of the triplet proximity effect.