Magnetic properties and spin polarization of Co 2Mn(Si xSn 1-x) alloys containing two L2 1 phases

A. Srinivasan, A. Rajanikanth, Y. K. Takahashi, K. Hono

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Bulk Co 2Mn(Si xSn 1-x) (0 < x < 1) alloys have been prepared and their crystal structure, magnetization and spin polarization have been measured. X-ray diffraction pattern and scanning electron micrograph revealed the alloy phase separate into two L2 1 phases, Co 2MnSi and Co 2MnSn for x ≥ 0.25. The saturation magnetization values corresponded to the value predicted by the Slater-Pauling (S-P) rule. Spin polarization measurements using point contact Andreev reflection (PCAR) technique showed that the quaternary alloys exhibited higher intrinsic spin polarization than the parent ternary compositions. The highest spin polarization of 0.67 ± 0.01 was obtained for the Co 2Mn(Si 0.5Sn 0.5) alloy. These studies show that isovalent substitution for Sn with Si in Co 2MnSn results in enhanced intrinsic spin polarization in spite of the phase separation.

Original languageEnglish
Pages (from-to)195-198
Number of pages4
JournalJournal of Alloys and Compounds
Volume514
DOIs
Publication statusPublished - 2012 Feb 15
Externally publishedYes

Keywords

  • Crystal structure
  • Half metals
  • Magnetization
  • Microstructure
  • Spin polarization
  • Transition metal alloys

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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