Sharee J. McNab, Richard J. Blaikie
Materials Research Society Symposium - Proceedings
Arrays of cylindrical magnetic particles have been made using interference lithography combined with electrodeposition. The cylinders are made from Ni, Co, CoP, or CoNi, with diameters of 57-180 nm, aspect ratios of 0.4-3, and array periods of 100-200 nm. The remanent states of the cylinders correspond to single-domain "flower" states or to magnetization vortices depending on the particle size and aspect ratio. Experimental data are in good agreement with a magnetic-state map calculated using a three-dimensional micromagnetic model, which shows the remanent state as a function of particle size and aspect ratio. The interactions between the particles, and their switching-field distribution, have been quantified.