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-geun Kim

Research output: Contribution to journalArticle

19 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 languageEnglish
Article number062506
JournalApplied Physics Letters
Volume99
Issue number6
DOIs
Publication statusPublished - 2011 Aug 8

Fingerprint

assemblies
nanoparticles
interactions
relaxation time
adjusting
magnetic permeability
magnetization
anisotropy
energy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Effect of interparticle interactions and size dispersion in magnetic nanoparticle assemblies : A static and dynamic study. / Sung Lee, Ji; Tan, Reasmey P.; Hua Wu, Jun; Kim, Young-geun.

In: Applied Physics Letters, Vol. 99, No. 6, 062506, 08.08.2011.

Research output: Contribution to journalArticle

@article{12d20aad81114c7899c9d8d9cc015919,
title = "Effect of interparticle interactions and size dispersion in magnetic nanoparticle assemblies: A static and dynamic study",
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.",
author = "{Sung Lee}, Ji and Tan, {Reasmey P.} and {Hua Wu}, Jun and Young-geun Kim",
year = "2011",
month = "8",
day = "8",
doi = "10.1063/1.3624833",
language = "English",
volume = "99",
journal = "Applied Physics Letters",
issn = "0003-6951",
publisher = "American Institute of Physics Publising LLC",
number = "6",

}

TY - JOUR

T1 - Effect of interparticle interactions and size dispersion in magnetic nanoparticle assemblies

T2 - A static and dynamic study

AU - Sung Lee, Ji

AU - Tan, Reasmey P.

AU - Hua Wu, Jun

AU - Kim, Young-geun

PY - 2011/8/8

Y1 - 2011/8/8

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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84860415006&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84860415006&partnerID=8YFLogxK

U2 - 10.1063/1.3624833

DO - 10.1063/1.3624833

M3 - Article

AN - SCOPUS:84860415006

VL - 99

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 6

M1 - 062506

ER -