Electron holography of core-shell Co/CoO spherical nanocrystals

Youhui Gao, Daisuke Shindo, Yuping Bao, Kannan Krishnan

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    11 Citations (Scopus)


    Phase profiles of core-shell CoCoO nanocrystals are imaged using off-axis electron holography. Contributions of mean inner potential and magnetic induction to the phase shift are extracted, respectively, to quantitatively characterize the nanocrystal geometry and magnetic spin arrangement in a self-assembled nanocrystal chain. It is also found that the spin of 11 nm diameter Co core encapsulated with 5-nm -thick CoO shell remains stable even at an elevated temperature of 200 °C, indicating that the magnetically thermal stability of cobalt nanocrystals is remarkably improved due to the exchange coupling between the ferromagnetic core and antiferromagnetic shell.

    Original languageEnglish
    Article number233105
    JournalApplied Physics Letters
    Issue number23
    Publication statusPublished - 2007

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)


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