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Publications (3)1.42 Total impact

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    ABSTRACT: Thermally assisted writing on high-coercivity synthetic ferrimagnetic media (SFM) was demonstrated using a conventional spin stand equipped with an optical head for commercial magnetooptical drives. The laser light (λ = 685 nm) was focused through a glass substrate onto a recording layer. The optical spot size was 1.1 μm and a commercial magnetic head had a writer width of ∼0.25 μm. The recording properties were measured as a function of the writing current (I<sub>w</sub>) and the laser power (P<sub>w</sub>). For the thermally stable medium with H<sub>c</sub> = 6 kOe, a laser irradiation with an optimum power significantly improved the overwrite performance and the signal-to-noise ratio (SNR) values. The SNR values were improved by optimizing P<sub>w</sub> over a wide writing current range. The improvements with the assist were found in both the signal and the noise. The media with a large dynamic coercivity value or with thick magnetic layers clearly showed the advantages with thermal assist.
    IEEE Transactions on Magnetics 03/2005; · 1.42 Impact Factor
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    ABSTRACT: Optically-assisted magnetic recording (OAMR) can solve fundamental problems concerning thermal fluctuation and write capability in magnetic recording, and it is regarded as the key technology in achieving density exceeding 1 Tbit/in2. OAMR is classified into magnetic dominant recording and optical dominant recording, and differences with respect to the recording method and effect between them are described. Magnetic dominant recording was conducted on longitudinal synthetic ferrimagnetic media to prove the fundamental effectiveness. Both SNR and overwritability without thermal erasure were assured. A theoretical estimation in optical dominant recording suggests that OAMR enables 10 times density compared with conventional magnetic recording. Butted grating should provide good optical characteristics as the heating element for optical dominant recording, and it also has compatibility with the conventional magnetic head for integration.© (2005) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
    01/2005;
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    ABSTRACT: Optically-assisted magnetic recording (OAMR) can solve fundamental problems concerning thermal fluctuation and write capability in magnetic recording, and it is regarded as the key technology in achieving density exceeding 1 Tbit/in2. OAMR is classified into magnetic dominant recording and optical dominant recording, and differences with respect to the recording method and effect between them are described. Magnetic dominant recording was conducted on longitudinal synthetic ferrimagnetic media to prove the fundamental effectiveness. Both SNR and overwritability without thermal erasure were assured. A theoretical estimation in optical dominant recording suggests that OAMR enables 10 times density compared with conventional magnetic recording. Butted grating should provide good optical characteristics as the heating element for optical dominant recording, and it also has compatibility with the conventional magnetic head for integration.
    Proceedings - Society of Photo-Optical Instrumentation Engineers 01/2005; 5643:177.