TY - JOUR
T1 - Effect of Co substitution for Mn on spin polarization and magnetic properties of ferrimagnetic Mn2VAl
AU - Deka, B.
AU - Srinivasan, A.
AU - Singh, R. K.
AU - Varaprasad, B. S.D.Ch S.
AU - Takahashi, Y. K.
AU - Hono, K.
N1 - Funding Information:
AS acknowledges financial support from Directorate of Extramural Research and Intellectual Property Rights, DRDO, India vide project no: ERIPR/ER/I00392/Ml/01/1381 .
Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
PY - 2016/3/25
Y1 - 2016/3/25
N2 - 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.
AB - 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.
KW - Arc melting
KW - Compensated ferrimagnet
KW - Half-metal
KW - Heusler alloys
KW - Spin polarization
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U2 - 10.1016/j.jallcom.2015.12.089
DO - 10.1016/j.jallcom.2015.12.089
M3 - Article
AN - SCOPUS:84951830795
SN - 0925-8388
VL - 662
SP - 510
EP - 515
JO - Journal of the Less-Common Metals
JF - Journal of the Less-Common Metals
ER -