Observation of magnetic domain in magnetic disk
A technological key to successful development of high-density magnetic disk lies in how to prevent mutual interference between adjacent bits i.e. how to provide narrower and simpler configulation of magnetic domain. Development of observation technique of finer magnetic domain, therefore, has been strongly required. Lorentz microscopy is one of the most promising method. Some studies have been made to observe recorded magnetic thin films.The purpose of the present investigation is to develop high resolution Lorentz microscopy(out of focus method) for investigation of recorded magnetic disk.High resolution and high voltage electron microscope (H-9000UHR) is used operating at 300kV. Objective lens is excited to realize smaller aberration. In order to protect specimens from magnetic field of objective lens, a special specimen holder is developed. Figure 1 shows a sectional view of objective lens and specimen holder.