  The magnetic properties of ordered nanoscale Co/Cu/Py multilayer antidot
films with different pore sizes prepared on top of nanoporous alumina membranes
are presented. By 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.
