Quantitative evaluation of magnetic flux density in a magnetic recording head and pseudo soft underlayer by electron holography

Weixing Xia, Kei Hirata, Keiichi Yanagisawa, Yoichi Ishida, Hiroto Kasai, Katsuaki Yanagiuchi, Daisuke Shindo, Akira Tonomura

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)

    Abstract

    The magnetic interaction between the pole tip of a single-pole head and a pseudo soft underlayer in perpendicular magnetic recording was observed by electron holography. The magnetic flux density inside the soft underlayer was quantitatively evaluated. The distribution of magnetic flux density was calculated using the finite element method, and the influences of the modulation of the reference wave and stray fields were investigated by comparison with experimental results. The flux density observed was found to be underestimated due to the modulation of the phase shift in reference wave. The magnetic flux measured experimentally was larger than that inside the specimen because of the relatively large stray fields above and below the specimen in the direction of the electron beam.

    Original languageEnglish
    Pages (from-to)331-337
    Number of pages7
    JournalJournal of Electron Microscopy
    Volume59
    Issue number5
    DOIs
    Publication statusPublished - 2010 Oct

    Keywords

    • electron holography
    • finite element method
    • magnetic head
    • soft underlayer

    ASJC Scopus subject areas

    • Instrumentation

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