Reversible magnetization variations in large field ranges associated to periodic arrays of antidots

The demagnetization processes taking place in different arrays of circular antidots lithographed in single crystalline Fe films were presented. These arrays have square symmetry and were characterized by geometric parameters with dimensions in the range of the magnetostatic coupling characteristic length. Two different models were considered in this study. The following results were obtained: (i) crossover of the demagnetization process was observed in all modeled system, (ii) coercivity decreased with the increase in interantidot distance and large reversible demagnetization before reversible rotation occurred, and (iii) in finite systems the coercivity decreases with respect to the infinite arrays.