Magnetic expansion readout of 0.2 μm packed domains on a magneto-optical disk with an in-plane magnetized readout layer

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  • Xiao Ying
    Engineering Research Laboratory, Hitachi Maxell, Ltd., Ibaraki 305-24, Japan
  • Kastusuke Shimazaki
    Engineering Research Laboratory, Hitachi Maxell, Ltd., Ibaraki 305-24, Japan
  • Hiroyuki Awano
    Engineering Research Laboratory, Hitachi Maxell, Ltd., Ibaraki 305-24, Japan
  • Masahumi Yoshihiro
    Engineering Research Laboratory, Hitachi Maxell, Ltd., Ibaraki 305-24, Japan
  • Hitoshi Watanabe
    Engineering Research Laboratory, Hitachi Maxell, Ltd., Ibaraki 305-24, Japan
  • Norio Ohta
    Engineering Research Laboratory, Hitachi Maxell, Ltd., Ibaraki 305-24, Japan
  • K. V. Rao
    Department of Condensed Matter Physics, Royal Institute of Technology, S-100 44 Stockholm, Sweden

抄録

<jats:p>We have investigated an in-plane magnetized readout-layer-based magnetic domain expansion phenomenon in a magneto-optical (MO) medium. Very high-density 0.2 μm packed domains are expanded up to three times the readout signal level in comparison with the conventional approach of applying alternative external field in the readout process. This result suggests that more than 10 Gbits/in.Reference 2 MO recording density may be achieved by implementing the domain expansion technique, using even the currently available 680 nm laser and numerical aperture of 0.55.</jats:p>

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