Mn2CrGa-based Heusler alloys with low net moment and high spin polarization

Wenyong Zhang, Yunlong Jin, Ralph Skomski, Parashu Kharel, Xingzhong Li, Tingyong Chen, Gejian Zhao, Dongrin Kim, Shah Valloppilly, David J. Sellmyer

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Mn2CrGa-based Heusler compounds combining small magnetization with high spin polarization, fabricated by Fe and Pt substitution for Cr, are investigated experimentally and discussed in terms of sublattice site occupancies. X-ray diffraction and electron diffraction indicate that the parent alloy and Mn2Cr0.6Fe0.4Ga are normal cubic Heusler alloys with substantial chemical disorder, whereas Mn2Cr0.6Pt0.4Ga crystallizes in the tetragonal D022 structure. Magnetization measurements indicate that the spin structure of the parent alloy is essentially ferrimagnetic, but alloying with Fe or Pt reduces the net magnetization per formula unit from 0.40 μ B in the parent alloy to nearly zero in the Fe case. The Curie temperature, the magnetoresistance, and the Andreev-reflection transport-spin polarization are less affected by the substitutions, the last changing from 65% in Mn2CrGa to 60% and 61% in the Fe- and Pt-substituted alloys, respectively. The properties of these alloys are favorable for spintronics applications.

Original languageEnglish (US)
Article number255001
JournalJournal of Physics D: Applied Physics
Volume51
Issue number25
DOIs
StatePublished - May 29 2018

Keywords

  • Heusler alloys
  • ferrimagnetism
  • magnetoresistance
  • spin electronics

ASJC Scopus subject areas

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

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    Zhang, W., Jin, Y., Skomski, R., Kharel, P., Li, X., Chen, T., Zhao, G., Kim, D., Valloppilly, S., & Sellmyer, D. J. (2018). Mn2CrGa-based Heusler alloys with low net moment and high spin polarization. Journal of Physics D: Applied Physics, 51(25), [255001]. https://doi.org/10.1088/1361-6463/aac346