Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 24, Pages 5628-5631Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.5628
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We present a theory of carrier-induced ferromagnetism in diluted magnetic semiconductors (III1-xMnxV) 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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