Abstract
We have performed an ab initio study of the oscillaton periods of the exchange-coupling in sandwiches of layers of Cr embedded in an Fe host, by means of a spin-polarized Green's function technique, based on the linear-muffin-tin-orbitals method within the tight-binding and atomic-sphere approximations. We treat Fe/Cr/Fe sandwiches with up to 12 monolayers of Cr and find that the calculated exchange coupling oscillates with a short-range period of 2 monolayers and a long-range period of approximately 8 monolayers (11 Å). This is in qualitative agreement with recent scanning electron microscopy measurements.
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