Abstract
Abstract Direct access storage devices are widely used in computers to store and manage data. In conventional magnetic recording, a magnetic head flying very close to the disc surface alters the polarization of the magnetic field at the disc surface to write and/or erase information on the disc. An optical disc is a multilayered medium consisting of a thick glass substrate on which many layers of different materials are sputtered. Only one of these layers serves as a recording medium and it is initially magnetized uniformly in one direction. To write on this disc, the initial magnetic field is altered by focusing light from a laser source with high numerical aperture (NA) lens to heat the magnetic medium beyond its Curie point, the temperature at which the magnetic medium loses its magnetization. This domain with zero magnetization is subsequently magnetized in the reversed direction by using an induction magnet. All these processes take place while the disc is rotating at a very high speed with respect t...
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