Self-assembled magnetic nanospheres with three-dimensional magnetic vortex

Min Kwan Kim, Prasanta Dhak, Ha Youn Lee, Jae Hyeok Lee, Myoung Woo Yoo, Jehyun Lee, Kyoungsuk Jin, Arim Chu, Ki Tae Nam, Hyun Soon Park, Shinji Aizawa, Toshiaki Tanigaki, Daisuke Shindo, Miyoung Kim, Sang Koog Kim

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)

    Abstract

    We report the electron holography images of spin configurations in peculiar assemblies of soft magnetic nanoparticles in single-, double-, triple-, or quadruple-sphere geometrical arrangements in which each particle has a three-dimensional (3D) magnetic-vortex structure. Micromagnetic numerical calculations reveal that the uniqueness of the nanoparticles' 3D vortex structure plays a crucial role in their assembly, especially in terms of the contrasting contributions of the exchange and dipolar interactions to their binding energies. The results represent physical insights into the assembly of 3D-vortex-structure magnetic nanoparticles in different geometrical configurations and offer a practical means of controlling those assemblies.

    Original languageEnglish
    Article number232402
    JournalApplied Physics Letters
    Volume105
    Issue number23
    DOIs
    Publication statusPublished - 2014 Dec 8

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

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