| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1606682 | Journal of Alloys and Compounds | 2016 | 6 Pages |
•(Mn1-xCox)2VAl alloys with highly ordered L21 structure has been obtained.•MnCoVAl is confirmed to be a half-metallic fully compensated ferrimagnet.•First report on spin polarization of a Heusler alloy based ferrimagnet.•Spin polarization of Mn2VAl increases upon Co substitution for Mn.
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.
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