Effect of Co substitution for Mn on spin polarization and magnetic properties of ferrimagnetic Mn2VAl

B. Deka, A. Srinivasan, R. K. Singh, B. S.D.Ch S. Varaprasad, Y. K. Takahashi, K. Hono

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Bulk (Mn1-xCox)2VAl (x = 0, 0.25, 0.50) alloys in highly ordered L21 structure with a very small amount of B2 disorder have been prepared and their magnetic properties have been measured. The value of saturation magnetizations of the alloys with x = 0, 0.25 and 0.50 are 1.88 μB, 0.84 μB and 0.07 μB, respectively, being consistent with 2.00 μB, 1.00 μB and 0 μB, respectively, predicted by the Slater-Pauling rule. This indicates that the stoichiometric MnCoVAl alloy is a fully compensated ferrimagnet (FCF). Spin polarization measurements using point contact Andreev reflection technique showed that the quaternary alloys exhibited higher intrinsic spin polarization than the parent ternary composition. The spin polarization of 0.60 deduced for the MnCoVAl alloy suggests that spin-polarized current can be extracted from FCF. Curie temperature (TC) and the effective anisotropy constant of (Mn1-xCox)2VAl alloys decrease with increase in Co content.

Original languageEnglish
Pages (from-to)510-515
Number of pages6
JournalJournal of Alloys and Compounds
Volume662
DOIs
Publication statusPublished - 2016 Mar 25
Externally publishedYes

Keywords

  • Arc melting
  • Compensated ferrimagnet
  • Half-metal
  • Heusler alloys
  • Spin polarization

ASJC Scopus subject areas

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

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