Abstract
The magnetization reversal process has been studied on a discontinuous metal-insulator multilayer sample [Co80Fe20(1.3 nm)/Al2O3(3 nm)]10 showing superferromagnetic (SFM) behavior. Size and shape of SFM domains can be changed by varying the angle θ between the magnetic field and the easy axis (EA). The magnetization reversal process along the EA is governed by domain wall motion. However, upon approaching the hard axis at increasing θ coherent rotation of superspins becomes dominant in the magnetization reversal process. This leads to the reduction of domain sizes for larger values of θ. The relaxation of magnetization has also been studied for various values of θ. We find fast relaxation along the easy axis, while the relaxation time increases for increasing θ. In general, the angular dependence of the magnetization reversal of SFM domains shows properties similar to continuous thin films.
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