Simulation of magnetic recording of periodic antidot array

Micromagnetic simulation is performed to study the recording quality of a permalloy (Py) antidot array. A Karlqvist head field is applied to a single bit region to reverse its magnetization. The signal quality is quantified by the reciprocal of noise N-1 and contrast ratio C-r, The results showed that N-1 and C-r increase significantly with the increasing of the bit aspect ratio. The value of C-r can also be improved by applying a bias field H-y throughout the film, for films with high aspect ratio. For those with low ratio, H-y causes undesirable switching of the neighbouring bits instead. (C) 2003 Elsevier B.V. All rights reserved.