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Abstract:
The magnetic properties of Mn3-xCoxGa Heusler alloys exhibit a very
interesting feature. While the Mn-rich alloys (x = 0.1-0.4) are similar
to Mn3Ga as they crystallize in a tetragonally distorted variation of
the Heusler structure and exhibit comparable hard-ferrimagnetic
properties highly useful for spin-transfer torque applications, the
Co-rich samples (x = 0.6-1) exhibit cubic Heusler structures, have
soft-magnetic hysteresis loops, and follow the generalized
Slater-Pauling curve indicating half-metallic ferrimagnetism. The Curie
temperatures of all alloys are above 700 K allowing for high operating
temperatures. (C) 2011 American Institute of Physics.
[doi:10.1063/1.3665260]
