Magnetization behavior of nanomagnets for patterned media application

S. Okamoto, Nobuaki Kikuchi, T. Kato, O. Kitakami, K. Mitsuzuka, T. Shimatsu, T. Shimatsu, H. Muraoka, H. Aoi, J.C. Lodder

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    14 Citations (Scopus)

    Abstract

    Bit patterned media (BPM) which utilize each magnetic nanostructured dot as one recorded bit has attracted much interest as a promising candidate for future high-density magnetic recording. In this study, the magnetization reversal behaviors of nanostructured L10-FePt, Co/Pt multilayer (ML), and CoPt/Ru dots are investigated. For Co/Pt and CoPt/Ru nanodots, the bi-stable state is maintained in a very wide size range up to several hundred nm, and the magnetization reversal is dominated by the nucleation of a small reversed nucleus with the dimension of domain wall width. On the other hand, the critical size for the bi-stability of L10-FePt is about 60 nm, and its magnetization reversal proceeds via domain wall displacement even for such a small dot size. These reversal behaviors, depending on the magnetic materials, might be attributed to the difference in structural inhomogeneity, such as defects. In addition to the magnetic properties, the structural uniformity of the material could be crucial for the BPM application.
    Original languageUndefined
    Article number10.1016/j.jmmm.2008.07.034
    Pages (from-to)2874-2879
    Number of pages6
    JournalJournal of magnetism and magnetic materials
    Volume320
    Issue number08HT8968C/22
    DOIs
    Publication statusPublished - Nov 2008

    Keywords

    • METIS-252067
    • EWI-13819
    • TST-SMI: Formerly in EWI-SMI
    • IR-62488
    • TST-uSPAM: micro Scanning Probe Array Memory

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