Abstract
An experimental study on the control of thin films magnetic coercivity through the change in geometry of antidot arrays has been performed on two different materials: cobalt and permalloy. Antidot arrays have been fabricated using a Focused Ion Beam, and magnetic hysteresis loops have been measured using Kerr effect microscopy. The coercivity dependence on the material and the array periodicity have been studied. A novel method to estimate the antidot diameter from MOKE data is presented. Results suggest a widening of the antidot effective diameter compared to the one measured from SEM images. This could be attributed to a damage of the magnetic material around the holes during the fabrication process, which leads to amorphization and concomitant reduction of the surrounding film magnetization.
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