Resonant indirect exchange via remote 2D channel

TL;DR

This paper explains the ferromagnetic behavior in a hybrid heterostructure using a resonant indirect exchange theory, highlighting the impact of quantum well properties on magnetic ordering.

Contribution

It introduces a theoretical model combining intralayer and resonant exchange contributions to explain ferromagnetism in quantum well heterostructures.

Findings

Maximum Curie temperature related to resonant exchange region

Good fit of theory to experimental Curie temperature dependence

Resonant exchange significantly influences ferromagnetic properties

Abstract

We apply the previously developed theory of the resonant indirect exchange interaction to explain the ferromagnetic properties of the hybrid heterostructure consisting of a InGaAs-based quantum well (QW) sandwiched between GaAs barriers with a remote Mn delta-layer. The experimentally obtained dependence of the Curie temperature on the QW depth exhibits a maximum related to the region of resonant indirect exchange. We suggest the theoretical explanantion and a fit to this dependence as a result of the two contributions to ferromagnetism - the intralayer contribution and the resonant exchange contribution provided by the QW.