Morphology and magnetic flux distribution in superparamagnetic, single-crystalline Fe3O4 nanoparticle rings

Yumu Takeno, Yasukazu Murakami, Takeshi Sato, Toshiaki Tanigaki, Hyun Soon Park, Daisuke Shindo, R. Matthew Ferguson, Kannan M. Krishnan

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    Abstract

    This study reports on the correlation between crystal orientation and magnetic flux distribution of Fe3O4 nanoparticles in the form of self-assembled rings. High-resolution transmission electron microscopy demonstrated that the nanoparticles were single-crystalline, highly monodispersed, (25nm average diameter), and showed no appreciable lattice imperfections such as twins or stacking faults. Electron holography studies of these superparamagnetic nanoparticle rings indicated significant fluctuations in the magnetic flux lines, consistent with variations in the magnetocrystalline anisotropy of the nanoparticles. The observations provide useful information for a deeper understanding of the micromagnetics of ultrasmall nanoparticles, where the magnetic dipolar interaction competes with the magnetic anisotropy.

    Original languageEnglish
    Article number183102
    JournalApplied Physics Letters
    Volume105
    Issue number18
    DOIs
    Publication statusPublished - 2014 Nov 3

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

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