A magneto-optical memory device includes a first unit projecting a light beam onto a desired position on a recording medium, and a second unit applying a magnetic field to a position onto which the light beam is projected. The second unit applies, to the recording medium, a predetermined magnetic field...http://www.google.com.au/patents/US6185162?utm_source=gb-gplus-sharePatent US6185162 - Method for adjusting magnetic and optical heads in magneto-optical recording device
