Magneto-optical (MO) disks possess the advantage of high-density recording compared with nonmagnetic optical disks, because MO recording is similar to the perpendicular magnetic recording of hard disk. The high-density storage requires very tiny domain recording and the MO signal then decreases rapidly with decreasing domain area. The key to achieving high-density recording is enhancement of the small MO signal using techniques like such as giant magneto resistance (GMR). As a solution, the magnetic domain expansion readout method has already been proposed.
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