Magnetic properties and phase stability of L21 phase in Co2Mn(Ga1-xZx)(Z=Si, Ge, and Sn) Heusler alloys

Okubo, A.; Umetsu, R. Y.; Kobayashi, K.; Kainuma, R.; Ishida, K.
May 2010
Applied Physics Letters;5/31/2010, Vol. 96 Issue 22, p222507
Academic Journal
For the Co2Mn(Ga1-xZx) (Z=Si, Ge, and Sn) Heusler alloys, the L21/B2 order-disorder transition temperature TtL21/B2, the Curie temperature TC, and the saturation magnetization Ms were determined. The TtL21/B2 for all the systems linearly increases with increasing x. Although the TtL21/B2 was not determined in the high x region because of melting of alloys, those of Co2MnGe and Co2MnSn could be estimated by extrapolation from the quaternary data. The Ms at 4.2 K and the TC increase with x, and the Ms for all the systems is in good agreement with the Slater Pauling rule.


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