TY - JOUR
T1 - High spin polarization in a two phase quaternary Heusler alloy Co2 Mn Al1-X SnX
AU - Rajanikanth, A.
AU - Kande, D.
AU - Takahashi, Y. K.
AU - Hono, K.
N1 - Funding Information:
This work was supported in part by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Scientific Research (B), 17360346, 2005. We thank Professor Asano at Nagoya University and Professor Mitani at Institute for Materials Research, Tohoku University, for valuable advice in the point contact Andreev reflection measurement, and Professor Inomata for discussion.
PY - 2007
Y1 - 2007
N2 - We have investigated the structure and the spin polarization of Co2 MnAl, Co2 MnSn, and Co2 Mn Al0.5 Sn0.5 alloys. The structures of the Co2 MnAl and Co2 MnSn alloys that were annealed for four days at 450 °C were B2 and L 21, respectively. Co2 Mn Al0.5 Sn0.5 had a dendrite microstructure that was formed by the phase separation into Al-enriched B2 and Sn-enriched L 21 phases during solidification. The saturation magnetization values of Co2 MnAl, Co2 Mn Al0.5 Sn0.5, and Co2 MnSn were 3.66 μB, 4.3 μB, and 4.9 μB, respectively, which are slightly lower than the theoretical values of 4 μB, 4.5 μB, and 5 μB due to the low degree of L 21 ordering. The spin polarization P measured by the point contact Andreev reflection technique were 0.56 for B2- Co2 MnAl, 0.6 for L 21 - Co2 MnSn, and interestingly, a higher value of 0.63 for the two phase Co2 Mn Al0.5 Sn0.5 alloy.
AB - We have investigated the structure and the spin polarization of Co2 MnAl, Co2 MnSn, and Co2 Mn Al0.5 Sn0.5 alloys. The structures of the Co2 MnAl and Co2 MnSn alloys that were annealed for four days at 450 °C were B2 and L 21, respectively. Co2 Mn Al0.5 Sn0.5 had a dendrite microstructure that was formed by the phase separation into Al-enriched B2 and Sn-enriched L 21 phases during solidification. The saturation magnetization values of Co2 MnAl, Co2 Mn Al0.5 Sn0.5, and Co2 MnSn were 3.66 μB, 4.3 μB, and 4.9 μB, respectively, which are slightly lower than the theoretical values of 4 μB, 4.5 μB, and 5 μB due to the low degree of L 21 ordering. The spin polarization P measured by the point contact Andreev reflection technique were 0.56 for B2- Co2 MnAl, 0.6 for L 21 - Co2 MnSn, and interestingly, a higher value of 0.63 for the two phase Co2 Mn Al0.5 Sn0.5 alloy.
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U2 - 10.1063/1.2714270
DO - 10.1063/1.2714270
M3 - Article
AN - SCOPUS:34248572367
SN - 0021-8979
VL - 101
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 9
M1 - 09J508
ER -