Introduction to half-metallic Heusler alloys: Electronic Structure and Magnetic Properties

Details Introduction to half-metallic Heusler alloys: Electronic Structure and Magnetic Properties Introduction to half-metallic Heusler alloys: Electronic Structure and Magnetic Properties

2005-10-11

arxiv.org/abs/cond-mat/0510276v1

J. Phys. D: Appl. Phys. 39 No 5 (7 March 2006) 765-775

Physics

Condensed Matter

Materials Science

28 pages, submitted for a special issue of 'Journal of Physics D: Applied Physics' on Heusler alloys

Scientific paper

10.1088/0022-3727/39/5/S01

Intermetallic Heusler alloys are amongst the most attractive half-metallic systems due to the high Curie temperatures and the structural similarity to the binary semiconductors. In this review we present an overview of the basic electronic and magnetic properties of both Heusler families: the so-called half-Heusler alloys like NiMnSb and the the full-Heusler alloys like Co$_2$MnGe. \textit{Ab-initio} results suggest that both the electronic and magnetic properties in these compounds are intrinsically related to the appearance of the minority-spin gap. The total spin magnetic moment $M_t$ scales linearly with the number of the valence electrons $Z_t$, such that $M_t=Z_t-24$ for the full-Heusler and $M_t=Z_t-18$ for the half-Heusler alloys, thus opening the way to engineer new half-metallic alloys with the desired magnetic properties.

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