New Recording Method Combining Thermo-Magnetic Writing and Flux Detection.

  • Saga Hideki
    Central Research Laboratory, Hitachi, Ltd., 1–280 Higashi–Koigakubo, Kokubunji–shi, Tokyo 185–8601, Japan
  • Nemoto Hiroaki
    Central Research Laboratory, Hitachi, Ltd., 1–280 Higashi–Koigakubo, Kokubunji–shi, Tokyo 185–8601, Japan
  • Sukeda Hirofumi
    Central Research Laboratory, Hitachi, Ltd., 1–280 Higashi–Koigakubo, Kokubunji–shi, Tokyo 185–8601, Japan
  • Takahashi Masahiko
    Central Research Laboratory, Hitachi, Ltd., 1–280 Higashi–Koigakubo, Kokubunji–shi, Tokyo 185–8601, Japan

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We have developed a new perpendicular thermo-magnetic recording method coupled with magnetic flux detection. The resolution is substantially improved by flux detection. Compared to the latest magneto-optical disk drives, the carrier-to-noise ratio of a reproduced signal is 5 dB higher, and the recording density reaches 8.3 Gbit/inch2. Moreover, this recording method has a good affinity to near-field optics, and it is an effective technique for attaining a higher density beyond the super-paramagnetic limitation in longitudinal magnetic recording.

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