Thermal collapse of spin-polarization in half-metallic ferromagnets

Details Thermal collapse of spin-polarization in half-metallic ferromagnets Thermal collapse of spin-polarization in half-metallic ferromagnets

2005-12-13

arxiv.org/abs/cond-mat/0512277v1

Phys. Rev. Lett. 97, 026404 (2006)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.97.026404

The temperature dependence of the magnetization and spin-polarization at the Fermi level is investigated for half-metallic ferromagnets. We reveal a new mechanism, where the hybridization of states forming the half-metallic gap depends on thermal spin fluctuations and the polarization can drop abruptly at temperatures much lower than the Curie point. We verify this for NiMnSb by ab-initio calculations. The thermal properties are studied by mapping ab-initio results to an extended Heisenberg model which includes longitudinal fluctuations and is solved by a Monte Carlo method.

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