Micromagnetic tailoring of periodic antidot permalloy arrays for high density storage

A micromagnetic study on antidot permalloy arrays is carried out in order t o delimit their possibilities for high density storage. The dependence of t he recorded bit quality on antidot size, separation distance, and film thic kness is reported as well as hysteresis loops and coercivities, The simulat ions show a limit for the antidot size around 80 nm leading to maximum area l storage densities of about 10 Gbits/in(2). The results are interpreted in terms of demagnetizing, anisotropy, and exchange energies' balance. (C) 19 98 American Institute of Physics. [S0003-6951(98)04051-0].