Time transient measurement of magnetic head field by using electron beam tomography

Abstract

Introduction The data rate of HDDs is increasing rapidly in accordance with the drastic growth in areal recording density. A detailed study of the switching characteristics of the write heads is therefore very important in order to enable us to develop high-frequency recording. The witching speed of the write field depends on the write current reversal time and the intrinsic head field reversal tune as indicated by Klaassen [l],12]. In their study, write field waveforms and their dependence on write current excitation were measured by an electron-beamtnmography method, and the eflect of eddy current loss of the pole, which is one of the crilical issues in high-frequency recording, was examined.