TITLE

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

AUTHOR(S)
Yang, H. T.; Hasegawa, D.; Takahashi, M.; Ogawa, T.
PUB. DATE
January 2009
SOURCE
Applied Physics Letters;1/5/2009, Vol. 94 Issue 1, p013103
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Monodisperse magnetite (Fe3O4) 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 Fe3O4 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 Fe3O4 NPs a noninteracting particle system formed with interparticle spacing above 31.5 nm.
ACCESSION #
36178251

 

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