Abstract
The effect of film thickness on magnetic properties of Cu80Co20 granular alloy was studied. It was observed that the susceptibility peak temperature, TM, strongly increases with the film thickness, t, for t<100 nm. The long-range nature of this effect points to magnetic dipole interaction as responsible mechanism. This dependence of TM can be explained within the framework 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 alloy.
Highlights
It is well known that the dc susceptibility of superparamagnetic systems exhibits a peak
This phenomenon was interpreted by Neel
overcome energy barriers to rotate the magnetic moments within the characteristic time of measurement
Summary
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