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

20 Citations (Scopus)


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
Issue number23
Publication statusPublished - 2014 Dec 8
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2014 AIP Publishing LLC.

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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