Abstract
Magnetic properties and stability of L21 and B2 phases in the Co2MnAl Heusler alloy were investigated. It was confirmed that the order-disorder transition from the B2 to L21 phase is located at about 950K and that the Curie temperature TC of the L21 phase is 726K which is about 50K higher than that (TC=677K) of the B2 phase. The difference in TC between the L21 and B2 phases is smaller than a theoretical prediction. On the other hand, the saturation magnetic moments Ms at 4.2K for the L21 and B2 phases were estimated to be 4.07μB∕f.u. and 4.16μB∕f.u., respectively, comparable to the value Mt=4 expected from the generalized Slater–Pauling relation.
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