We have studied the magnetic-field and concentration dependences of the magnetizations of the hole and Mn subsystems in diluted ferromagnetic semiconductor Ga_{1-x}Mn_xAs. A mean-field approximation to the hole-mediated interaction is used, in which the hole concentration p(x) is parametrized in terms of a fitting (of the hole effective mass and hole/local moment coupling) to experimental data on the Tc critical temperature. The dependence of the magnetizations with x, for a given temperature, presents a sharply peaked structure, with maxima increasing with applied magnetic field, which indicates that application to diluted-magnetic-semiconductor devices would require quality-control of the Mn-doping composition. We also compare various experimental data for Tc(x) and p(x) on different Ga_{1-x}Mn_xAs samples and stress the need of further detailed experimental work to assure that the experimental measurements are reproducible.
@article{arxiv.cond-mat/0301184,
title = {Magnetic-field effects in defect-controlled ferromagnetic Ga_{1-x}Mn_xAs semiconductors},
author = {Raimundo R. dos Santos and J. d'Albuquerque e Castro and L. E. Oliveira},
journal= {arXiv preprint arXiv:cond-mat/0301184},
year = {2009}
}
Comments
RevTeX 4, 3 two-column pages, 4 colour figures; to appear in J Appl Phys