Theory of Diluted Magnetic Semiconductor Ferromagnetism
Jürgen König, Hsiu-Hau Lin, Allan H. MacDonald
Abstract
We present a theory of carrier-induced ferromagnetism in diluted magnetic semiconductors (III1-x Mnx 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.
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