Magnitude and crystalline anisotropy of hole magnetization in (Ga,Mn)As

TL;DR

This paper develops a theory for hole magnetization in (Ga,Mn)As that relaxes previous approximations, revealing a larger magnitude and negligible anisotropy, aligning well with experimental data.

Contribution

The paper introduces a refined theoretical model for hole magnetization in (Ga,Mn)As that accounts for crystalline anisotropy without the spherical approximation.

Findings

Hole magnetization magnitude is significantly greater than previous estimates.

Anisotropy of hole magnetization is practically negligible.

Theoretical results agree with experimental measurements.

Abstract

Theory of hole magnetization Mc in zinc-blende diluted ferromagnetic semiconductors is developed relaxing the spherical approximation of earlier approaches. The theory is employed to determine Mc for (Ga,Mn)As over a wide range of hole concentrations and a number of crystallographic orientations of Mn magnetization. It is found that anisotropy of Mc is practically negligible but the obtained magnitude of Mc is significantly greater than that determined in the spherical approximation. Its sign and value compares favorably with the results of available magnetization measurements and ferromagnetic resonance studies.