Technical Issues for Realization of Perpendicular Magnetic Recording

Abstract

First of all, it is confilrmed analytically that perpendicular magnetic recording has a much higher writing resolution which will reach a bit size corresponding to diameters of several magnetic particles when a sharper field gradient of a head and a narrower particle coercive force distribution of a medium are realized. After that, a writing head for perpendicular magnetic recording is discussed from a view point of the sharpness of the head field distribution around the trailing edge and the writing characteristics of a novel single-pole type flying head are presented. Furthermore, several technical issues for practical use of perpendicular magnetic recording such as media noise, thermal relaxation, head induced erasure and so on are discussed.