Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1999-07-05
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Revised version; discussions and references improved; accepted by JMMM
Scientific paper
10.1016/S0304-8853(00)00145-1
By an accurate Green's function method we calculate conductances and the corresponding Giant Magneto-Resistance effects (GMR) of two metallic ferromagnetic films separated by different spacers, metallic and non-metallic ones, in a simplified model on a sc lattice, in CPP and CIP geometries (i.e. current perpendicular or parallel to the planes), without impurities, or with interface- or bulk impurities. The electronic structure of the systems is approximated by two hybridized orbitals per atom, to mimic s-bands and d-bands and their hybridization. We show that such calculations usually give rough estimates only, but of the correct order of magnitude; in particular, the predictions on the impurity effects depend strongly on the model parameters. One of our main results is the prediction of huge CPP-GMR effects for {\it non-metallic} spacers in the ballistic limit.
Böhm Markus
Gebele O.
Krey U.
Krompiewski S.
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