Abstract
We report enhancement of L21 order and the resultant improvement of spin polarization of Co2MnSi (CMS) Heusler alloy thin films by a small amount of Ag alloying (xAg⩽4.5 atomic (at.) %). The degree of L21 order in CMS increases with xAg(=2.7at.% and 4.5at.%), which shows a positive correlation with the magnitude of negative anisotropic magnetoresistance ratio, suggesting the enhancement of spin polarization. Since the benefit of Ag-doping was confirmed even at low annealing temperature around 350°C, this method could be useful for processing spintronic devices using Heusler alloys at relatively low annealing or substrate temperature.
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