Abstract
The Heusler alloy Co 2Cr 1− x Fe x Al, predicted to be half-metallic for low x , has recently shown relatively large giant and tunnel magnetoresistances in thin film structures. However, the saturation magnetic moment and spin polarization for low x films has been found to fall significantly short of the theoretical half-metallic values. Using transmission electron microscopy and X-ray diffraction, we have observed the presence of a second hcp A 3 phase in B 2 epitaxial thin films of Heusler alloy Co 2Cr 1− x Fe x Al with x < 1 . Assuming this second phase to have a lower magnetic moment and spin polarization than the B 2 phase explains the reduction in magnetic moments and spin polarizations observed in this class of compounds.
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