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Magnetic properties of Co50-xNixMn25Al25 alloys with B2 structure

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6 Author(s)
Okubo, A. ; Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-02 Aoba, Sendai 980-8579, Japan ; Xu, X. ; Umetsu, R.Y. ; Kanomata, T.
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Magnetic properties of the B2 phase in Co50-xNixMn25Al25 alloys were investigated. Spontaneous magnetization Ms measured at 4.2 K increases linearly with increasing x in the region of x ≤ 30 in accordance with following the generalized Slater-Pauling (GSP) line. However, Ms abruptly decreases with increasing x and deviates from the GSP line in the Ni-rich region of x > 30, suggesting a drastic change in the density of states at the Fermi energy. The Curie temperature TC decreases monotonically with increasing x and significantly decreases in the region of x > 30. Antiferromagnetic evidence is clearly observed at x > 45, and the Néel temperature TN increases with increasing x, in reaching the value of the B2 phase in Ni2MnAl.

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Journal of Applied Physics  (Volume:109 ,  Issue: 7 )