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Oscillations of the giant magnetoresistance (GMR) and thermo-electric power(TEP) vs. both the thickness of the non-magnetic spacer and also that of theferromagnetic slabs are studied in the current-perpendicular-to-plane (CPP)geometry of magnetic trilayer systems, in terms of a single-band tight-bindingmodel without impurities. The spin-dependent conductance has been calculatedfrom the Kubo formula by means of a recursion Green's function method and thesemi-infinite ideal-lead wires trick. Additionally the TEP is obtained directlyfrom Mott's formula. In general, the thickness oscillations of the GMR and theTEP may have just one or two (short and long) oscillations. The long period,related to spectacular beats, is apparently of non-RKKY type. The TEPoscillations are strongly enhanced with respect to those of the GMR, have thesame periods, but different phases and a negative bias.Comment: 4 Latex pages, figures inlined, to appear in Phys.Rev.

Unusual beats of the perpendicular-current giant magnetoresistance and thermopower of magnetic trilayers