Tuning the ferromagnetic properties of hydrogenated GaMnAs

TL;DR

This paper demonstrates how hydrogenation and annealing can effectively tune the ferromagnetic properties of GaMnAs by controlling hole density, leading to significant changes in Curie temperature and magnetic anisotropy.

Contribution

It introduces a method to precisely control ferromagnetic properties in GaMnAs through hydrogenation and annealing, with experimental validation.

Findings

Hole density reduction decreases Curie temperature.

Magnetic anisotropy is modified by hydrogenation.

Results align with mean-field theory predictions.

Abstract

Hydrogenation and posthydrogenation annealings have been used as a very efficient tool to tune the hole density over a wide range, at fixed magnetic moment concentration, in thin GaMnAs layers. Reduction of the hole density resulted in strong modifications of their ferromagnetic properties. In particular, we observed in magnetotransport experiments the decrease of the Curie temperature, along with modifications of the magnetic anisotropy, a behavior consistent with the mean-field theory.