Long-Range Triplet Supercurrents Induced by Singlet Supercurrents Parallel to Magnetic Interfaces

TL;DR

This paper demonstrates that spin-singlet supercurrents flowing parallel to magnetic interfaces can generate significant long-range triplet supercurrents in diffusive ferromagnetic structures, with potential for experimental verification.

Contribution

It introduces a novel mechanism for generating long-range triplet supercurrents via parallel flow of singlet supercurrents, independent of junction geometry.

Findings

Long-range triplet supercurrents are effectively generated by singlet supercurrents parallel to interfaces.

Unequal ferromagnet thicknesses enhance triplet supercurrent effects.

Proposed experimental structure isolates long-range triplet effects.

Abstract

Employing a spin-parameterized Kleldysh-Usadel technique for the diffusive regime, we demonstrate that even in the low proximity limit, considerable long-ranged triplet supercurrents can be effectively generated by spin-singlet supercurrents flowing \textit{parallel} to the interfaces of uniform double ferromagnet interlayers with noncollinear exchange fields "{\it independent}" of actual junction geometry. The triplet supercurrents are found to be most pronounced when the thicknesses of the ferromagnet strips are unequal. To experimentally verify this generic phenomenon, we propose an accessible and well-controlled structure that can fully isolate the long-range triplet effects.