We investigate and discuss the origin of interface resistance in magnetic trilayers with the half-metallic Co2MnSi by performing first-principles electronic-structure and ballistic transport calculations for Co2MnSi/X/Co2MnSi(001) (X= Ag, Au, Al, V, Cr). We found that the matching of the Fermi surface projected to the two-dimensional Brillouin zone of in-plane wave vector (k) is a main contributing factor for the spacer (X) dependence of the interfacial resistance. Furthermore, the MnSi-terminated interface shows low resistance compared with the Co-terminated interface because the Co-terminated interface has a larger d component in the local density of states at the Fermi level than that of the MnSi-terminated interface. We conclude that Ag, Au, and Al spacers with MnSi termination of CMS/X/CMS trilayers will provide the large interfacial spin-asymmetry coefficient because of the small interface resistance in parallel magnetization.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 2011 10 20|
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