Simulation of magnetic recording of periodic antidot array

Abstract

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 Cr, The results showed that N-1 and Cr increase significantly with the increasing of the bit aspect ratio. The value of Cr can also be improved by applying a bias field Hy throughout the film, for films with high aspect ratio. For those with low ratio, Hy causes undesirable switching of the neighbouring bits instead. © 2003 Elsevier B.V. All rights reserved.