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

H. T. Yang; D. Hasegawa; M. Takahashi; T. Ogawa

doi:10.1063/1.3063032

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

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

ENG - Electronic Engineering

Research output: Contribution to journal › Article › peer-review

63 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 language	English
Article number	013103
Journal	Applied Physics Letters
Volume	94
Issue number	1
DOIs	https://doi.org/10.1063/1.3063032
Publication status	Published - 2009

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.3063032

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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.",

author = "Yang, {H. T.} and D. Hasegawa and M. Takahashi and T. Ogawa",

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T1 - Achieving a noninteracting magnetic nanoparticle system through direct control of interparticle spacing

AU - Yang, H. T.

AU - Hasegawa, D.

AU - Takahashi, M.

AU - Ogawa, T.

N1 - Funding Information: This work is supported by the Japan Society for the Promotion of Science.

PY - 2009

Y1 - 2009

N2 - 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.

AB - 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.

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ER -

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

Abstract

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