Phase separation and magnetic properties of half-metal-type Co2Cr1-xFexAl alloys

Kobayashi, K.; Umetsu, R.Y.; Kainuma, R.; Ishida, K.; Oyamada, T.; Fujita, A.; Fukamichi, K.
November 2004
Applied Physics Letters;11/15/2004, Vol. 85 Issue 20, p4684
Academic Journal
The phase stability and magnetic properties of the half-metal-type Co2Cr1-xFexAl alloy system were investigated. It was found that the occurrence of two-phase separation is unavoidable in a concentration range of less than x=0.4, leading to deviation of the saturation magnetic moments from the generalized Slater-Pauling line. The L21-type phase becomes stable in a concentration range of more than x=0.7, where no half-metallic behaviors are present. Consequently, it is concluded that the most favorable concentration for applications to spintronic devices is located around x=0.4 in Co2Cr1-xFexAl alloys having the B2-type phase.


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