New High-$T_c$ Half-Heusler Ferromagnets NiMnZ (Z = Si, P, Ge, As)

Details New High-$T_c$ Half-Heusler Ferromagnets NiMnZ (Z = Si, P, Ge, As) New High-$T_c$ Half-Heusler Ferromagnets NiMnZ (Z = Si, P, Ge, As)

2008-01-15

arxiv.org/abs/0801.2225v1

J. Phys. Soc. Jpn. 77 (2008) 014705

Physics

Condensed Matter

Materials Science

6 pages, 6 figures

Scientific paper

10.1143/JPSJ.77.014705

Based on the first principle calculation, we propose a new class of high-$T_c$ half-heusler ferromagnets NiMnZ (Z = Si, P, Ge, As). The structural and magnetic properties are investigated through the calculation of the electronic structure, phase stability, equilibrium lattice constant, magnetic exchange interaction $J_{ij}$ and Curie temperature $T_c$. It is found that all alloys show half-metallicity and ferromagnetism at temperatures much higher than room temperature in a wide range of lattice expansion (compression). At the equilibrium lattice constant, $T_c$ of 715K, 840K, 875K and 1050K are predicted by Monte Carlo simulation for NiMnP, NiMnAs, NiMnGe and NiMnSi, respectively. Following these results, these alloys are strongly expected to be promising candidates for spintronic applications.

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