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The magnetoresistance (MR) of 10 nm to 200 nm thin polycrystalline Co-films,deposited on glass and insulating Si(100), is studied in fields up to 120 kOe,aligned along the three principal directions with respect to the current:longitudinal, transverse (in-plane), and polar (out-of-plane). At technicalsaturation, the anisotropic MR (AMR) in polar fields turns out to be up totwice as large as in transverse fields, which resembles the yet unexplainedgeometrical size-effect (GSE), previously reported for Ni- and Permalloy films.Upon increasing temperature, the polar and transverse AMR's are reduced byphonon-mediated sd-scattering, but their ratio, i.e. the GSE remains unchanged.Basing on Potters's theory [Phys.Rev.B 10, 4626(1974)], we associate the GSEwith an anisotropic effect of the spin-orbit interaction on the sd-scatteringof the minority spins due to a film texture. Below magnetic saturation, themagnitudes and signs of all three MR's depend significantly on the domainstructures depicted by magnetic force microscopy. Based on hysteresis loops andtaking into account the GSE within an effective medium approach, the three MR'sare explained by the different magnetization processes in the domain states.These reveal the importance of in-plane uniaxial anisotropy and out-of-planetexture for the thinnest and thickest films, respectively.Comment: 10 pages, 9 figure

Magnetoresistance anisotropy of polycrystalline cobalt films: Geometrical-size and domain effects