We investigate the properties of epitaxial Co2Cr1−xFexAl-based multilayers grown by dc magnetron sputtering upon MgO substrates. Co2Cr1−xFexAl/Cr superlattices of high epitaxial quality can be grown, though no evidence for antiferromagnetic coupling is observed. Simple spin-valve trilayers of the form Co2Cr1−xFexAl/Cu/Co90Fe10 show large giant magnetoresistances of up to 6.8% at room temperature, comparable to the highest achieved in conventional exchange-biased spin valves.
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Kelekar et al. (2005) studied this question.