Magnetization reversal process of hard/soft nano-composite structures formed by ion irradiation

M. Aniya, A. Shimada, Y. Sonobe, K. Sato, T. Shima, K. Takanashi, Simon J. Greaves, T. Ouchi, Takayuki Homma

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Discrete track media (DTM) and bit-patterned media (BPM) are being extensively studied as routes to achieve higher density hard disk drives. In the DTM and BPM, it is essential to isolate the data tracks or bits with non-magnetic materials to reduce the magnetic noise from adjacent tracks or bits. In contrast to the conventional procedure of physically etching the media, we attempted to isolate the tracks or bits with soft regions using an area-selective ion irradiation method. We prepared hard and soft nano-composite structures by nanoimprinting, followed by ion irradiation. In this study, we confirmed the magnetic reversal process of the hard and soft regions of the nano-composite structure using magnetic force microscopy (MFM) with various external applied magnetic fields. The analysis of the magnetization reversal process of patterned Coupled Granular Continuous (CGC) films with weak exchange coupling confirmed the validity of this novel approach for the fabrication of DTM and BPM.

    Original languageEnglish
    Article number5467376
    Pages (from-to)2132-2135
    Number of pages4
    JournalIEEE Transactions on Magnetics
    Volume46
    Issue number6
    DOIs
    Publication statusPublished - 2010 Jun

    Fingerprint

    Magnetization reversal
    Ion bombardment
    Composite structures
    Magnetic force microscopy
    Exchange coupling
    Hard disk storage
    Etching
    Magnetic fields
    Fabrication

    Keywords

    • CGC films
    • Discrete-track media
    • Exchange coupling
    • Ion irradiation
    • Magnetic modification
    • Patterned media

    ASJC Scopus subject areas

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

    Cite this

    Magnetization reversal process of hard/soft nano-composite structures formed by ion irradiation. / Aniya, M.; Shimada, A.; Sonobe, Y.; Sato, K.; Shima, T.; Takanashi, K.; Greaves, Simon J.; Ouchi, T.; Homma, Takayuki.

    In: IEEE Transactions on Magnetics, Vol. 46, No. 6, 5467376, 06.2010, p. 2132-2135.

    Research output: Contribution to journalArticle

    Aniya, M, Shimada, A, Sonobe, Y, Sato, K, Shima, T, Takanashi, K, Greaves, SJ, Ouchi, T & Homma, T 2010, 'Magnetization reversal process of hard/soft nano-composite structures formed by ion irradiation', IEEE Transactions on Magnetics, vol. 46, no. 6, 5467376, pp. 2132-2135. https://doi.org/10.1109/TMAG.2010.2043229
    Aniya, M. ; Shimada, A. ; Sonobe, Y. ; Sato, K. ; Shima, T. ; Takanashi, K. ; Greaves, Simon J. ; Ouchi, T. ; Homma, Takayuki. / Magnetization reversal process of hard/soft nano-composite structures formed by ion irradiation. In: IEEE Transactions on Magnetics. 2010 ; Vol. 46, No. 6. pp. 2132-2135.
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