Physics of high density recording thin film media established by ultra clean sputtering process

Migaku Takahashi, Hiroki Shoji

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    To achieve high density magnetic recording media through systematic experiments by applying the ultra clean sputtering process the following universal guiding principles are proposed: (1) Hc/Hkgrain ≈ 0.4 (isotropic), (2) to suppress the magnetostatic coupling effect due to the grain size reduction 4πMs/Hkgrain < 1.0, (3) grain diameter < 10 nm, (4) (110), (100) preferred grain orientation of HCP crystallite, (5) for the improvement of D50, tBr < 50 Gμm, (6) for freezing the superparamagnetic effect due to grain size reduction vKugrain/kT ≥ 40, Kugrain ≥ 3 × 106 erg/cm3 (v: volume of magnetic grain, Kugrain : magnetocrystalline anisotropy energy constant, kT: thermal energy).

    Original languageEnglish
    Pages (from-to)44-51
    Number of pages8
    JournalJournal of Magnetism and Magnetic Materials
    Volume193
    Issue number1-3
    DOIs
    Publication statusPublished - 1999 Jan 1

    Keywords

    • Grain diameter
    • High density magnetic recording
    • Intergranular exchange coupling
    • Intergranular magnetostatic coupling
    • Magnetocrystalline anisotropy energy constant
    • Preferred grain orientation
    • Thin film media

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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