Ferromagnetic resonance studies of very thin cobalt films on a gold substrate

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Abstract
Ferromagnetic resonance measurements in Co films of 11.3, 20, and 80 Å thickness sandwiched by Au have been made as a function of the dc magnetic field orientation in a plane perpendicular to the film. These polycrystalline films were measured to have the hcp structure with the c axis perpendicular to the film plane within a few degrees. The experimental results are well explained by a theoretical model where an axial magnetic anisotropy up to the second-order term is included.