Designing a fully compensated half-metallic ferrimagnet

Mario Žic, Karsten Rode, Naganivetha Thiyagarajah, Yong Chang Lau, Davide Betto, J. M.D. Coey, Stefano Sanvito, Kerry J. O'Shea, Ciaran A. Ferguson, Donald A. Maclaren, Thomas Archer

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Recent experimental work on Mn2RuxGa demonstrates its potential as a compensated ferrimagnetic half metal (CFHM). Here we present a set of high-throughput ab initio density functional theory calculations and a detailed experimental characterization that enable us to correctly describe the nominal Mn2RuxGa thin films, in particular, with regard to site disorder and defects. We then construct models that accurately capture all the key features of the Mn-Ru-Ga system, including magnetic compensation and the spin gap at the Fermi level. We find that electronic doping is necessary, which is achieved with a Mn/Ga ratio smaller than two. Our study shows how composition and substrate-induced biaxial strain can be combined to design a ferrimagnetic half metal with a compensation point close to room temperature.

Original languageEnglish
Article number140202
JournalPhysical Review B
Volume93
Issue number14
DOIs
Publication statusPublished - 2016 Apr 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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