Cubic MnSb: epitaxial growth of a predicted room temperature half-metal

Details Cubic MnSb: epitaxial growth of a predicted room temperature half-metal Cubic MnSb: epitaxial growth of a predicted room temperature half-metal

2011-09-30

arxiv.org/abs/1109.6902v1

Physics

Condensed Matter

Materials Science

3 figures

Scientific paper

Epitaxial films including bulk-like cubic and wurtzite polymorphs of MnSb have been grown by molecular beam epitaxy on GaAs via careful control of the Sb4/Mn flux ratio. Nonzero-temperature density functional theory was used to predict ab initio the spin polarization as a function of reduced magnetization for the half-metals NiMnSb and cubic MnSb. In both cases, half-metallicity is lost at a threshold magnetization reduction, corresponding to a temperature T*< Tc. This threshold is far higher for cubic MnSb compared to NiMnSb and corresponds to T* > 350K, making epitaxial cubic MnSb a promising candidate for room temperature spin injection into semiconductors.

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