The effect of iron addition on the spin polarization and magnetic properties of Co2CrGa Heusler alloy

T. M. Nakatani, Z. Gercsi, A. Rajanikanth, Y. K. Takahashi, K. Hono

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16 Citations (Scopus)

Abstract

We report the effect of the substitution of Co with Fe in Co 2-xFexCrGa Heusler alloys (x = 0-0.3) on their magnetic property, electronic band structure and spin polarization, both experimentally and theoretically. The intrinsic spin polarization of Co2CrGa measured by the point-contact Andreev reflection method was P = 0.61 0.02, whereas a small substitution with Fe for Co of x = 0.1 enhanced the spin polarization to P = 0.67 0.03 regardless of a weak L21 order. Ab initio calculations for both the perfectly L21 ordered and partially disordered structures showed that the small amount of Fe induced a robustness of the spin polarization against the structural disorder. These results demonstrate the effect of the Fe addition in Co2CrGa is to improve the spin polarization even with the presence of chemical disorder.

Original languageEnglish
Article number225002
JournalJournal of Physics D: Applied Physics
Volume41
Issue number22
DOIs
Publication statusPublished - 2008 Nov 21
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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