Theory of Diluted Magnetic Semiconductor Ferromagnetism
Condensed Matter
2009-10-31 v2
Abstract
We present a theory of carrier-induced ferromagnetism in diluted magnetic semiconductors (III_{1-x} Mn_x V) which allows for arbitrary itinerant-carrier spin polarization and dynamic correlations. Both ingredients are essential in identifying the system's elementary excitations and describing their properties. We find a branch of collective modes, in addition to the spin waves and Stoner continuum which occur in metallic ferromagnets, and predict that the low-temperature spin stiffness is independent of the strength of the exchange coupling between magnetic ions and itinerant carriers. We discuss the temperature dependence of the magnetization and the heat capacity.
Keywords
Cite
@article{arxiv.cond-mat/0001320,
title = {Theory of Diluted Magnetic Semiconductor Ferromagnetism},
author = {Jürgen König and Hsiu-Hau Lin and Allan H. MacDonald},
journal= {arXiv preprint arXiv:cond-mat/0001320},
year = {2009}
}