Magnetic Properties of Co/Cu/Py Antidot Films With Different Pore Diameters

The magnetic properties of ordered nanoscale Co/Cu/Py multilayer antidot films with different pore sizes prepared on top of nanoporous alumina membranes (NAMs) are presented. Using Co and Py films separated by a Cu thin layer, and tuning the pore diameters of the NAMs, we were able to play with the coercivity of the films and observe stepped magnetization curves, as a consequence of the different coercivities of the Co and Py films. The magnetic properties of the multilayer antidots have been measured and compared with results obtained for antidots of Cu/Py. The magnetization reversal process that occurs in each individual layer and in the multilayer was studied by means of micromagnetic simulations.