Thickness dependence of magnetic properties of granular thin films with interacting particles

The effect of film thickness on magnetic properties of Cu80Co20 granular al loy was studied. It was observed that the susceptibility peak temperature, T-M, strongly increases with the film thickness, t, for t < 100 nm. The lon g-range nature of this effect points to magnetic dipole interaction as resp onsible mechanism. This dependence of T-M can be explained within the frame work of Dormann's theory of dipolar interaction between magnetic particles. The coercive field has different thickness dependence and it is related to formation of magnetic domain structure of Co particles in the granular all oy. (C) 1999 American Institute of Physics. [S0003-6951(99)03032-6].