縮小された光スポットによる高密度光磁気記録

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In this paper, we examine the influence of the optical spot diameter on the magneto-optical recording properties. An optical spot with a reduced diameter of 380 nm was obtained by using a semiconductor blue laser and a solid immersion lens. As a medium, we used magnetic bilayer media, which can be read with GMR heads and are available for hybrid recording. It was proved that the shrinkage of the spot considerably changed the recording properties. Calculation based on Huth's theory explained the increase in the shrinking force that acts on the domain wall. This increase is mainly caused by the steeper temperature variation in the focused spot. However, this force can be compensated for by controlling the film composition, and we successfully wrote domains with a diameter of 30% of the recording optical spot diameter.
2001-04-01