Novel sputtering process to reduce the grain size and its distribution in Co-based longitudinal thin film media - New seedlayer and high KuGrain material

M. Takahashi, H. Shoji, D. D. Djayaprawira, S. Yoshimura

    Research output: Contribution to journalConference articlepeer-review

    8 Citations (Scopus)

    Abstract

    To reduce the grain size and its distribution, two kinds of new techniques have been introduced. In the first one, a new WCr seedlayer combined with dry-etching process was found to be effective in reducing the grain size of magnetic layer while maintaining the intergranular magnetic interactions. As the results, the media signal to noise ratio is significantly increased. In the second one, the usage of Co co-precipitated NiP/Al plated layer combined with dry-etching and oxygen exposure processes was found to be effective to increase the media signal to noise ratio while maintaining the resolution and coercivity. A new ternary magnetic alloy of Co-Ge-Cr (85 at. % Co, 10 at. % Ge, 5 at. % Cr) was found to have the following magnetic properties: KuGrain = 3 × 106 erg/cm3, Hkgrain = 10 kOe and 4 π Mk/Hkgrain < 1.0. This new magnetic material is a very promising candidate for use in high-density magnetic recording media.

    Original languageEnglish
    Pages (from-to)2315-2320
    Number of pages6
    JournalIEEE Transactions on Magnetics
    Volume36
    Issue number5 I
    DOIs
    Publication statusPublished - 2000 Sep 1
    Event2000 International Magnetics Conference (INTERMAG 2000) - Toronto, Ont, Canada
    Duration: 2000 Apr 92000 Apr 12

    Keywords

    • Co co-precipitated NiP/Al substrate
    • Co-Ge-Cr alloy
    • Dry-etching
    • High magnetocrystalline anisotropy material
    • Oxygen exposure
    • Seedlayer

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Electrical and Electronic Engineering

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