Spiral Exchange Coupling in Trilayer Magnetic Junction Mediated by Diluted-Magnetic-Semiconductor Thin Film

TL;DR

This paper investigates the non-collinear exchange coupling in trilayer magnetic junctions with diluted-magnetic-semiconductor thin films, highlighting the significant influence of spin relaxation on the magnetic interaction type.

Contribution

It reveals the crucial role of spin relaxation in favoring spiral exchange over oscillatory RKKY interaction, expanding understanding of magnetic coupling mechanisms.

Findings

Spin relaxation promotes spiral exchange coupling.

Numerical analysis across parameter space.

Comparison of spiral and RKKY interactions.

Abstract

We revisit the non-collinear exchange coupling across the trilayer magnetic junction mediated by the diluted-magnetic-semiconductor thin film. By numerical approaches, we investigate the spiral angle between the ferromagnetic layers extensively in the parameter space. In contrast to previous study, we discovered the important role of spin relaxation, which tends to favor spiral exchange over the oscillatory Ruderman-Kittel-Kasuya-Yosida interaction. Finally, we discuss the physics origins of these two types of magnetic interactions.