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Coercivity Dependence on Periodicity of Co and Py Antidot Arrays
Celia Cast´an-Guerrero,Juan Bartolom´e,Fernando Bartolom´e,Luis Miguel Garc´ıa,Javier Ses´e,Pavel Strichovanec,Julia Herrero-Albillos,Karla J. Merazzo,Manuel V´azquez,Paolo Vavassori 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
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.