Numerical simulations of collective magnetic properties and magnetoresistance in 2D ferromagnetic nanoparticle arrays

R. P. Tan, J. S. Lee, J. U. Cho, S. J. Noh, D. K. Kim, Young-geun Kim

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Magnetic properties and magnetoresistance (MR) in 2D magnetic nanoparticle (NP) arrays are investigated by solving the Landau-Lifshitz-Gilbert equation at T = 0 K. The interparticle interactions induce a decrease in the coercive field and in the MR amplitude compared with the non-interacting case, while in some cases, the variation of the remanent magnetization is found to be non-monotonic when increasing the dipolar strength. For different values of the anisotropy, these variations of the coercive field, the remanent magnetization and the MR ratio are reproduced and exhibit a scaling on the dipolar/anisotropy ratio. These results suggest that the magnetic properties of the assemblies can be described by an individual or collective behaviour depending on the balance between the magnetic anisotropy and the dipolar interactions. In the case of strongly interacting NPs, the corresponding configurations of the magnetic moments at the remanent state reveal the formation of a ferromagnetic order at moderate dipolar strength (increase in the remanent magnetization) while small ferromagnetic domains/chains coupled antiferromagnetically are obtained in the case of strongly interacting NPs (decrease in the remanent magnetization). Such domains lead to a reduction in the MR amplitude and to a deviation from the m2-law in the resistance-magnetic field [R(H)] characteristic of the non-interacting case.

Original languageEnglish
Article number165002
JournalJournal of Physics D: Applied Physics
Volume43
Issue number16
DOIs
Publication statusPublished - 2010 Apr 22

Fingerprint

Magnetoresistance
Magnetization
Magnetic properties
Nanoparticles
magnetic properties
nanoparticles
magnetization
Computer simulation
anisotropy
Anisotropy
simulation
Magnetic anisotropy
Magnetic moments
assemblies
magnetic moments
interactions
Magnetic fields
deviation
scaling
configurations

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Cite this

Numerical simulations of collective magnetic properties and magnetoresistance in 2D ferromagnetic nanoparticle arrays. / Tan, R. P.; Lee, J. S.; Cho, J. U.; Noh, S. J.; Kim, D. K.; Kim, Young-geun.

In: Journal of Physics D: Applied Physics, Vol. 43, No. 16, 165002, 22.04.2010.

Research output: Contribution to journalArticle

@article{ee43b74a89b64e7aad01b25930b3c740,
title = "Numerical simulations of collective magnetic properties and magnetoresistance in 2D ferromagnetic nanoparticle arrays",
abstract = "Magnetic properties and magnetoresistance (MR) in 2D magnetic nanoparticle (NP) arrays are investigated by solving the Landau-Lifshitz-Gilbert equation at T = 0 K. The interparticle interactions induce a decrease in the coercive field and in the MR amplitude compared with the non-interacting case, while in some cases, the variation of the remanent magnetization is found to be non-monotonic when increasing the dipolar strength. For different values of the anisotropy, these variations of the coercive field, the remanent magnetization and the MR ratio are reproduced and exhibit a scaling on the dipolar/anisotropy ratio. These results suggest that the magnetic properties of the assemblies can be described by an individual or collective behaviour depending on the balance between the magnetic anisotropy and the dipolar interactions. In the case of strongly interacting NPs, the corresponding configurations of the magnetic moments at the remanent state reveal the formation of a ferromagnetic order at moderate dipolar strength (increase in the remanent magnetization) while small ferromagnetic domains/chains coupled antiferromagnetically are obtained in the case of strongly interacting NPs (decrease in the remanent magnetization). Such domains lead to a reduction in the MR amplitude and to a deviation from the m2-law in the resistance-magnetic field [R(H)] characteristic of the non-interacting case.",
author = "Tan, {R. P.} and Lee, {J. S.} and Cho, {J. U.} and Noh, {S. J.} and Kim, {D. K.} and Young-geun Kim",
year = "2010",
month = "4",
day = "22",
doi = "10.1088/0022-3727/43/16/165002",
language = "English",
volume = "43",
journal = "Journal Physics D: Applied Physics",
issn = "0022-3727",
publisher = "IOP Publishing Ltd.",
number = "16",

}

TY - JOUR

T1 - Numerical simulations of collective magnetic properties and magnetoresistance in 2D ferromagnetic nanoparticle arrays

AU - Tan, R. P.

AU - Lee, J. S.

AU - Cho, J. U.

AU - Noh, S. J.

AU - Kim, D. K.

AU - Kim, Young-geun

PY - 2010/4/22

Y1 - 2010/4/22

N2 - Magnetic properties and magnetoresistance (MR) in 2D magnetic nanoparticle (NP) arrays are investigated by solving the Landau-Lifshitz-Gilbert equation at T = 0 K. The interparticle interactions induce a decrease in the coercive field and in the MR amplitude compared with the non-interacting case, while in some cases, the variation of the remanent magnetization is found to be non-monotonic when increasing the dipolar strength. For different values of the anisotropy, these variations of the coercive field, the remanent magnetization and the MR ratio are reproduced and exhibit a scaling on the dipolar/anisotropy ratio. These results suggest that the magnetic properties of the assemblies can be described by an individual or collective behaviour depending on the balance between the magnetic anisotropy and the dipolar interactions. In the case of strongly interacting NPs, the corresponding configurations of the magnetic moments at the remanent state reveal the formation of a ferromagnetic order at moderate dipolar strength (increase in the remanent magnetization) while small ferromagnetic domains/chains coupled antiferromagnetically are obtained in the case of strongly interacting NPs (decrease in the remanent magnetization). Such domains lead to a reduction in the MR amplitude and to a deviation from the m2-law in the resistance-magnetic field [R(H)] characteristic of the non-interacting case.

AB - Magnetic properties and magnetoresistance (MR) in 2D magnetic nanoparticle (NP) arrays are investigated by solving the Landau-Lifshitz-Gilbert equation at T = 0 K. The interparticle interactions induce a decrease in the coercive field and in the MR amplitude compared with the non-interacting case, while in some cases, the variation of the remanent magnetization is found to be non-monotonic when increasing the dipolar strength. For different values of the anisotropy, these variations of the coercive field, the remanent magnetization and the MR ratio are reproduced and exhibit a scaling on the dipolar/anisotropy ratio. These results suggest that the magnetic properties of the assemblies can be described by an individual or collective behaviour depending on the balance between the magnetic anisotropy and the dipolar interactions. In the case of strongly interacting NPs, the corresponding configurations of the magnetic moments at the remanent state reveal the formation of a ferromagnetic order at moderate dipolar strength (increase in the remanent magnetization) while small ferromagnetic domains/chains coupled antiferromagnetically are obtained in the case of strongly interacting NPs (decrease in the remanent magnetization). Such domains lead to a reduction in the MR amplitude and to a deviation from the m2-law in the resistance-magnetic field [R(H)] characteristic of the non-interacting case.

UR - http://www.scopus.com/inward/record.url?scp=77950968379&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77950968379&partnerID=8YFLogxK

U2 - 10.1088/0022-3727/43/16/165002

DO - 10.1088/0022-3727/43/16/165002

M3 - Article

VL - 43

JO - Journal Physics D: Applied Physics

JF - Journal Physics D: Applied Physics

SN - 0022-3727

IS - 16

M1 - 165002

ER -