Tuning the ferromagnetic properties of hydrogenated GaMnAs
Résumé
The neutralization of Mn acceptors by hydrogenation is used as a tool to investigate the dependence of the magnetic properties of ferromagnetic GaMnAs upon the hole concentration. The suppression of ferromagnetism and the emergence of a paramagnetic phase are observed after hydrogenation. The ferromagnetic phase is progressively restored after subsequent annealings, with Curie temperature increasing with hole density.