Cubic Mn 2 Ga Thin films: Crossing the spin gap with ruthenium

H. Kurt, K. Rode, P. Stamenov, M. Venkatesan, Y. C. Lau, E. Fonda, J. M.D. Coey

Research output: Contribution to journalArticlepeer-review

77 Citations (Scopus)

Abstract

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 Mn2RuxGa 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.

Original languageEnglish
Article number027201
JournalPhysical review letters
Volume112
Issue number2
DOIs
Publication statusPublished - 2014 Jan 15
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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