MAGNETIC STUDIES OF POLYCRYSTALLINE MAGNETOSTRICTIVE COPD FILMS WITH LARGE PLANAR STRAIN

We report on ferromagnetic resonance and torque curves measurements in electrodeposited CoPd alloy films with composition ranged from Co13Pd 87 to Co45Pd55. We show that the origin of the multimode structure of ferromagnetic resonance spectra in these strongly magnetostrictive pol ycrystalline films can be satisfactorily explained on the basis of the independent-grain-approach for a textured microstructure. The fourfol d periodicity of the torque curves for the compositional range of 30-3 5 at% of Co seems to be originated by the microstructure features whic h lead to a distribution of the easy axis directions within the films.