Magnetically Induced Super-Resolution without an External Magnetic Field

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  • Nishikiori K.
    Optical Disk Systems Development Center, Matsushita Electric Industrial Co., Ltd.
  • Murakami M.
    Optical Disk Systems Development Center, Matsushita Electric Industrial Co., Ltd.
  • Uchida K.
    Optical Disk Systems Development Center, Matsushita Electric Industrial Co., Ltd.
  • Birukawa M.
    Optical Disk Systems Development Center, Matsushita Electric Industrial Co., Ltd.
  • Miyatake N.
    Optical Disk Systems Development Center, Matsushita Electric Industrial Co., Ltd.

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Other Title
  • 外部磁界不要の磁気超解像
  • ガイブ ジカイ フヨウ ノ ジキ チョウ カイゾウ
  • 外部磁界不要の磁気超解像 (<特集>磁気光学・光磁気記録)

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Abstract

The potential advantages of magnetically induced super-resolution (MSR) for high-density recording in magneto-optical disks have spurred the study of various related technology. MSR systems can read signals from a smaller area than the laser spot area by using magnetic films with different temperature characteristics. Most MSR systems require an external magnetic field in the readout. We have developed a new type of MSR (S-RAD) that does not require an external magnetic filed. The front masking area of the S-RAD is formed by shrinking the recording mark in the readout layer. This paper describes the readout principle and readout characteristics of S-RAD. A C/N of 49 dB was obtained at the 0.5μm recording mark. A crosstalk level of less than -40 dB was obtained at a track pitch of 0.8μm. We believe that S-RAD has sufficient potential to allow practical use of high-density magneto-optical recording.

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