  Ferromagnetic vortices deliver robust out-of-plane magnetization at extremely
small scales. Their handling and creation therefore has high potential to
become a necessary ingredient for future data storage technologies in order to
keep up with the pace of growing information density demands. In this study we
show that by using one step nanolithography method, we are able to create
ferromagnetic vortex lattices in thin nickel films. The necessary control of
the magnetic stray field at the domain edges was achieved by actively modifying
the ferromagnetic thin film anisotropic properties at nanometer scale. We
present experimental evidence using ferromagnetic resonance and
magnetoresistance measurements supporting simulations based on the theoretical
prediction of the proclaimed vortex structures.
