Antidot Jewelry lattices made of magnetic thin films are good candidates to be employed in future magnetic recording media.In this manuscript we present a study on the effect of shape and field-induced magnetic anisotropies on the magnetization reversal of 10 nm and 50 nm thick permalloy antidot lattices.Rounded antidot square lattices were fabricated using a combination of electron beam evaporation and laser interference lithography, covering surfaces of a few cm2.We demonstrate that a magnetic anisotropy induced in the samples, as a consequence of an applied magnetic field during growth, competes with the shape anisotropy that dominates the response of the patterned thin films, and that the effect of the field-induced magnetic anisotropy scales with the thickness of the antidot thin films.
Finally, we have quantified the Building Blocks anisotropy constant attributable to the uniaxial field-induced magnetic anisotropy in our antidot lattices.These findings are supported by micromagnetic simulations performed using MuMax3.