Effect of interparticle interactions and size dispersion in magnetic nanoparticle assemblies: A static and dynamic study

Ji Sung Lee; Reasmey P. Tan; Jun Hua Wu; Young Keun Kim

doi:10.1063/1.3624833

Effect of interparticle interactions and size dispersion in magnetic nanoparticle assemblies: A static and dynamic study

Ji Sung Lee, Reasmey P. Tan, Jun Hua Wu, Young Keun Kim

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

23 Citations (Scopus)

Abstract

Interparticle interactions in magnetic nanoparticles are studied by dc and ac magnetization measurements. For non-interacting nanoparticles, while the anisotropy constant of the nanoparticles K _eff 1.6 × 10 ⁵ erg/cm ³ is accurately determined by fitting zero-field-cooled and field-cooled measurements, we show that K _eff values deduced only from time relaxation measurements must require simultaneous adjustments of the complex susceptibility by taking into account the size distribution of nanoparticles. This leads to K _eff 1.7 × 10 ⁵ erg/cm ³ in agreement with dc measurements. For interacting nanoparticles, comparisons with theoretical models show that energies due to magnetic dipolar interactions can only be predicted for weak and moderate interactions.

Original language	English
Article number	062506
Journal	Applied Physics Letters
Volume	99
Issue number	6
DOIs	https://doi.org/10.1063/1.3624833
Publication status	Published - 2011 Aug 8

Bibliographical note

Funding Information:
This work was supported in part by the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (2011-0016497, 2011-0001715), the KRCF-DRC Program, and the Seoul R&BD Program (10920). R.P.T. acknowledges the financial support by the Brain 21 Program from the NRF of Korea.

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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abstract = "Interparticle interactions in magnetic nanoparticles are studied by dc and ac magnetization measurements. For non-interacting nanoparticles, while the anisotropy constant of the nanoparticles K eff 1.6 × 10 5 erg/cm 3 is accurately determined by fitting zero-field-cooled and field-cooled measurements, we show that K eff values deduced only from time relaxation measurements must require simultaneous adjustments of the complex susceptibility by taking into account the size distribution of nanoparticles. This leads to K eff 1.7 × 10 5 erg/cm 3 in agreement with dc measurements. For interacting nanoparticles, comparisons with theoretical models show that energies due to magnetic dipolar interactions can only be predicted for weak and moderate interactions.",

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AU - Hua Wu, Jun

AU - Keun Kim, Young

N1 - Funding Information: This work was supported in part by the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (2011-0016497, 2011-0001715), the KRCF-DRC Program, and the Seoul R&BD Program (10920). R.P.T. acknowledges the financial support by the Brain 21 Program from the NRF of Korea.

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N2 - Interparticle interactions in magnetic nanoparticles are studied by dc and ac magnetization measurements. For non-interacting nanoparticles, while the anisotropy constant of the nanoparticles K eff 1.6 × 10 5 erg/cm 3 is accurately determined by fitting zero-field-cooled and field-cooled measurements, we show that K eff values deduced only from time relaxation measurements must require simultaneous adjustments of the complex susceptibility by taking into account the size distribution of nanoparticles. This leads to K eff 1.7 × 10 5 erg/cm 3 in agreement with dc measurements. For interacting nanoparticles, comparisons with theoretical models show that energies due to magnetic dipolar interactions can only be predicted for weak and moderate interactions.

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Effect of interparticle interactions and size dispersion in magnetic nanoparticle assemblies: A static and dynamic study

Abstract

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