Achieving a noninteracting magnetic nanoparticle system through direct control of interparticle spacing

H. T. Yang, D. Hasegawa, Migaku Takahashi, T. Ogawa

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

Monodisperse magnetite (Fe3 O4) nanoparticles (NPs) were synthesized and coated using a SiO2 shell with controlled thickness ranging from 3.0 to 20.0 nm. The temperature-dependent zero-field-cooled (ZFC) and field-cooled (FC) magnetizations of the 7.5 nm Fe3 O4 NPs with systematically increasing interparticle spacing were studied using the continuous and intermittent cooling protocol. The experimental evidence from dc magnetization and simulated ZFC/FC curves reveal that the increasing interparticle spacing modulated the collective magnetic behavior by effectively lowering the interparticle dipolar coupling, and for 7.5 nm Fe3 O4 NPs a noninteracting particle system formed with interparticle spacing above 31.5 nm.

Original languageEnglish
Article number013103
JournalApplied Physics Letters
Volume94
Issue number1
DOIs
Publication statusPublished - 2009 Jan 19

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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