In situ observations of domain wall motion in Mn-Zn and Ni-Zn ferrites by Lorentz microscopy and electron holography

T. Kasahara, H. S. Park, D. Shindo, H. Yoshikawa, T. Sato, K. Kondo

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)

    Abstract

    Domain wall motion in Mn-Zn and Ni-Zn ferrites with applied magnetic fields is investigated by in situ observations with Lorentz microscopy and electron holography. It is found that both Mn-Zn and Ni-Zn ferrites have a mean grain size of approximately 10 μm and several pores with sizes ranging from 0.2 to 1.1 μm. In situ observations by Lorentz microscopy with an applied magnetic field reveals that in Mn-Zn ferrite, the domain walls move easily across the grain boundary, while in Ni-Zn ferrite, the domain walls move along the grain boundary but are pinned at the grain boundary and pores. From in situ observations of Ni-Zn ferrite by electron holography, it is clarified that domain wall pinning at the grain boundary retards a sensitive increase in magnetic flux parallel to the applied field direction, which is considered to result in high hysteresis loss.

    Original languageEnglish
    Pages (from-to)165-170
    Number of pages6
    JournalJournal of Magnetism and Magnetic Materials
    Volume305
    Issue number1
    DOIs
    Publication statusPublished - 2006 Oct

    Keywords

    • Domain wall motion
    • Domain wall pinning
    • Electron holography
    • Ferrites
    • Hysteresis loss
    • In situ Lorentz microscopy

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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