Arrays of Permalloy antidot thin films have been prepared by sputtering onto hexagonally ordered anodic alumina templates. Geometry parameters of antidot arrays have been tailored so that, final diameter ranges between 35 and 66nm, and film thickness is tuned between 18 and 138nm while the hexagonal symmetry lattice is kept constant to 105nm. Magnetic characteristics have been investigated by vibrating sample magnetometry, magneto-optic Kerr effect and magnetic force microscopy imaging. The magnetization process has been analysed as a function of the mentioned geometry parameters that determine the main magnetic energy contribution that is the stray-field energy coming from local distribution of magnetic charges around the antidots. The magnetization reversal mechanism is concluded to be due to displacements of domain walls for thick films while its motion is damped by the presence of antidots. In the case of thinner films and wider nanohole diameter a significant contribution from magnetization rotation mechanism is observed.
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