The nature of magnetic interactions in CoFe-Ag(Cu) granular thin films

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Abstract
The effect of dipolar and exchange interactions on the magnetic behaviour of sputtered CoFe-Ag(Cu) granular alloys is examined through the study of remanence curves and M plots as a function of the ferromagnetic volume content, xv , and annealing temperature. As-deposited samples, with either a random distribution of weakly interacting fine magnetic particles (3 nm in size) at low xv or with strong dipolar and exchange interactions (leading to a long range out-of-plane stripe-like domain structure) at xv 0.25, display negative M values. In the former, this is attributed to dipolar interactions being dominant in a random distribution of well separated particles. In the latter, M xv , annealed samples display positive M values.

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