We report the spin polarization of (, 0.3, 0.5, 0.7) bulk alloys measured by the point contact Andreev reflection method. All the alloys had an structure along with - and -type disorder. Several off-stoichiometric alloys were prepared to understand the effect of the compositional deviation from the stoichiometry on the spin polarization. By substituting Al for Si, the spin polarization changed from for to a maximum value of for . The off-stoichiometric alloys had spin polarizations of . Ab initio calculations were performed to interpret the effect of Al addition as well as the effect of disorder on the magnetic properties and on the electronic structure.
Structure, magnetic property, and spin polarization of Heusler alloys
T. M. Nakatani, A. Rajanikanth, Z. Gercsi, Y. K. Takahashi, K. Inomata, K. Hono; Structure, magnetic property, and spin polarization of Heusler alloys. J. Appl. Phys. 1 August 2007; 102 (3): 033916. https://doi.org/10.1063/1.2767229
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