Cubic Mn2Ga thin films: crossing the spin gap with ruthenium

Cubic Mn2Ga films with the half-Heusler C1b structure are grown on V (001) epitaxial films. The phase is a soft ferrimagnet, with Curie temperature TC = 225 K and magnetization Ms=280  kA m(-1), equivalent to 1.65μB per formula. Adding ruthenium leads to an increase of TC up to 550 K in cubic Mn2Ru(...

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Bibliographic Details
Published in:Physical review letters 2014-01, Vol.112 (2), p.027201-027201
Main Authors: Kurt, H, Rode, K, Stamenov, P, Venkatesan, M, Lau, Y-C, Fonda, E, Coey, J M D
Format: Article
Language:English
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Summary:Cubic Mn2Ga films with the half-Heusler C1b structure are grown on V (001) epitaxial films. The phase is a soft ferrimagnet, with Curie temperature TC = 225 K and magnetization Ms=280  kA m(-1), equivalent to 1.65μB per formula. Adding ruthenium leads to an increase of TC up to 550 K in cubic Mn2Ru(x)Ga films with x = 0.33 and a collapse of the net magnetization. The anomalous Hall effect changes sign at x = 0.5, where the sign of the magnetization changes and the magnetic easy direction flips from in plane to perpendicular to the film. The Mn2Ru0.5Ga compound with a valence electron count of 21 is identified as a zero-moment ferrimagnet with high spin polarization, which shows evidence of half-metallicity.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.112.027201