Life estimation of carbon overcoat on magnetic media for heatassisted magnetic recording using novel Raman spectroscopy

    研究成果: Conference contribution

    2 引用 (Scopus)

    抜粋

    A heat-assisted magnetic recording (HAMR) is expected for a future high density recording of a hard disk drive. However, a carbon overcoat (COC) composed of diamond-like carbon (DLC) or a lubricant film is possibly damaged when a magnetic medium, i.e. CoPt alloy, is heated at around Curie temperature (Tc) of 600K by a near-field HAMR head. We carried out HAMR simulation experiments by using newly developed Raman spectroscopic systems, composed of plasmonic sensors for surface-enhanced Raman scattering (SERS), a pulsed laser heating, and an in-situ temperature measurement with an intensity ratio of anti-Stokes/Stokes lines. It was found that the heated temperature of the COC is higher than that of the magnetic film, i.e., 580°C and 366°C, respectively. Intensity changes of G-band peak in Raman spectra for DLC films were observed during the pulsed laser heating. The Raman intensity was exponentially decreased by oxidation in air, where time constants were calculated as a parameter of a pulse width. Degradation life of the DLC film can be estimated from a critical pulse width, where the time constant is extrapolated to zero. The estimated pulse width for no degradation was 250μs at the heating temperature of 580°C. The result shows no damage can be estimated in DLC films for HAMR because the effective irradiation time is 5ns and the accumulated irradiation time is 0.5ms in HAMR operations.

    元の言語English
    ホスト出版物のタイトルASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016
    出版者American Society of Mechanical Engineers
    ISBN(電子版)9780791849880
    DOI
    出版物ステータスPublished - 2016
    イベントASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016 - Santa Clara, United States
    継続期間: 2016 6 202016 6 21

    Other

    OtherASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016
    United States
    Santa Clara
    期間16/6/2016/6/21

    ASJC Scopus subject areas

    • Control and Systems Engineering
    • Hardware and Architecture
    • Information Systems

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  • これを引用

    Yanagisawa, M., Kunimoto, M., & Homma, T. (2016). Life estimation of carbon overcoat on magnetic media for heatassisted magnetic recording using novel Raman spectroscopy. : ASME 2016 Conference on Information Storage and Processing Systems, ISPS 2016 American Society of Mechanical Engineers. https://doi.org/10.1115/ISPS2016-9513