Nowadays advanced magnetic tunnel junction applications demand very high tunnel magnetoresistance at room temperature, thus it is quite important to explore high Curie temperature T c half-metallic Heusler alloys. In this article first-principles calculation unveiled that NiCrMnSi has a T c of 1200 K comparable to that of traditional Co2MnSi Heusler alloys, even though it does not contain a Co element. In addition, we examined whether NiCrMnSi Heusler phase films can be obtained by magnetron sputtering on MgO substrates. The results of the structural analysis and first-principles calculations indicated that the NiCrMnSi Heusler phase is metastable. A possible route to obtain a metastable NiCrMnSi Heusler alloy is to utilize appropriate templates.
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