Reduction in remanent magnetization using a multi-layered single-pole writer

Abstract Magnetization configurations within a multi-layered pole tip (PT), which is composed of ferromagnetic layers and non-magnetic layers, of a single-pole writer have been examined through a micromagnetic computer simulation based on the Landau–Lifshitz–Gilbert equation. The magnetization configuration and perpendicular component of the remanent head field ( H r ) were found to be strongly dominated by the number of magnetic layers in the PT and the exchange coupling field ( H ex ) between magnetic layers. The maximum intensity of H r ( H rmax ) was decreased as H ex and the number of magnetic layers were increased. These results show that a multi-layered PT is an effective structure reducing H rmax , which enables suppressing head-induced data erasure.