Cubic Mn2Ga thin films: crossing the spin gap with ruthenium.

نویسندگان

  • H Kurt
  • K Rode
  • P Stamenov
  • M Venkatesan
  • Y-C Lau
  • E Fonda
  • J M D Coey
چکیده

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.

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عنوان ژورنال:
  • Physical review letters

دوره 112 2  شماره 

صفحات  -

تاریخ انتشار 2014