Magnetic interaction between GaMnAs layers via spin-polarized quasi-two-dimensional hole gas: Monte Carlo simulation

TL;DR

This paper investigates the magnetic interactions in GaMnAs bilayers mediated by a spin-polarized hole gas, using Monte Carlo simulations to understand ferromagnetic order in thin layers.

Contribution

It introduces a self-consistent Monte Carlo simulation approach to study indirect exchange interactions in GaMnAs bilayers considering hole polarization effects.

Findings

Ferromagnetic order can be established in thin layers due to hole polarization.

Inter- and intra-layer interactions influence magnetic coupling.

Self-consistency between magnetic order and electronic structure is crucial.

Abstract

The magnetic order resulting from an indirect exchange between magnetic moments in the metallic phase of a Ga(1-x)Mn(x)As bilayered structure is studied "via" Monte Carlo simulation. The coupling mechanism involves a perturbative calculation in second order of the interaction between the magnetic moments and carriers (holes). We take into account a possible polarization of the hole gas establishing, thus, self-consistency between the magnetic order and the electronic structure. It leads to a ferromagnetic order even in the case of thin layers. This fact is analyzed in terms of the inter- and intra-layer interactions.