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Spin-polarized half-metallic state of a ferromagnetic δ layer in a semiconductor host

AuthorsCaprara, S.; Tugushev, V. V.; Chulkov, Eugene V.
Issue Date2011
PublisherAmerican Physical Society
CitationPhysical Review B 84(8): 085311 (2011)
AbstractWe discuss a model which is apt to describe the appearance of a spin-polarized half-metallic state around a single δ layer of a magnetic transition metal embedded into a nonmagnetic semiconductor host. We show that ferromagnetism in this system can be attributed to the intrinsic physical properties of the δ layer. The relevant physical effects described by our model are the hybridization of the electron states of the metal and semiconductor atoms, the charge redistribution around the δ layer, and the electron-electron correlation on a metal atom, which is the driving force of ferromagnetism. We obtain the mean-field phase diagram of the model at zero and finite temperature, both in the case when the chemical potential is fixed, and when the density of particles on the δ layer is fixed. The relevance of our results in connection with numerical and experimental results on the so-called digital magnetic heterostructures, in the absence and in the presence of a quantum-well carrier channel, is eventually discussed. © 2011 American Physical Society.
Identifiersdoi: 10.1103/PhysRevB.84.085311
issn: 1098-0121
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