Distribution of niobium in an Fe-Pt-Nb magnet

Y. Tanaka, K. Udoh, K. Hisatsune, T. Sakurai

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    The role of Nb addition to improve the hard magnetic properties in FePt magnet was investigated by characterizing microstructures of both Fe-39.5 at.%Pt binary and Fe-39.5 at.%Pt-0.75 at.%Nb ternary alloys using transmission electron microscopy and atom probe field ion microscopy. In the as-quenched ternary alloy, the FePt ordered domains with a tweed contrast were observed as well as in the binary alloy. However, the ordered domain size of the ternary alloy was slightly smaller than that of the binary alloy and comparable to the thickness of magnetic domain wall. Although the coercivity of the as-quenched ternary alloy was small, subsequent annealing produced high coercivity. Nb was rarely solved in the FePt ordered phase and was concentrated in spherical particles of sub-microns in size. These particles may work as a pinning site against magnetic domain wall motion. Another possibility is that the change in composition ratio between Fe and Pt may be responsible to the magnetic property change.

    Original languageEnglish
    Pages (from-to)164-168
    Number of pages5
    JournalMaterials Science and Engineering A
    Volume250
    Issue number1
    DOIs
    Publication statusPublished - 1998 Jul 15

    Keywords

    • Atom probe field ion microscopy
    • Hard magnet
    • L1 structure
    • Order-disorder phase transition
    • Transmission electron microscopy

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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