Internal magnetic structure of dextran coated magnetite nanoparticles in solution using small angle neutron scattering with polarization analysis

K. L. Krycka, A. J. Jackson, J. A. Borchers, J. Shih, R. Briber, Robert Ivkov, C. Grttner, C. L. Dennis

Research output: Contribution to journalArticle

Abstract

For many applications, the internal magnetic domain structure of magnetic nanoparticles may play a critical role in the determination of their collective magnetic properties. Here we utilize polarization analyzed small angle neutron scattering (PASANS) to study the individual magnetic morphologies of an interacting aqueous Fe3O4 nanoparticle system. Our results demonstrate that the total magnetic moment of the colloid is randomized, as expected in low fields, while the nuclear structure is anisotropic. Model fits indicate that the magnetic domains within the nanoparticle core at 1.5 mT have dimensions that approximate those of the structural grains perpendicular to the field, but the domains extend over multiple grains along the field direction. The asymmetry in the magnetic domain formation in weak fields undoubtedly contributes to the magnetic anisotropy and thus to the enhanced heating reported for hyperthermia applications of these systems.

Original languageEnglish (US)
Article number07B513
JournalJournal of Applied Physics
Volume109
Issue number7
DOIs
StatePublished - Apr 1 2011

Fingerprint

dextrans
magnetic domains
magnetite
neutron scattering
nanoparticles
polarization
hyperthermia
nuclear structure
colloids
magnetic moments
asymmetry
magnetic properties
anisotropy
heating

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Internal magnetic structure of dextran coated magnetite nanoparticles in solution using small angle neutron scattering with polarization analysis. / Krycka, K. L.; Jackson, A. J.; Borchers, J. A.; Shih, J.; Briber, R.; Ivkov, Robert; Grttner, C.; Dennis, C. L.

In: Journal of Applied Physics, Vol. 109, No. 7, 07B513, 01.04.2011.

Research output: Contribution to journalArticle

Krycka, K. L. ; Jackson, A. J. ; Borchers, J. A. ; Shih, J. ; Briber, R. ; Ivkov, Robert ; Grttner, C. ; Dennis, C. L. / Internal magnetic structure of dextran coated magnetite nanoparticles in solution using small angle neutron scattering with polarization analysis. In: Journal of Applied Physics. 2011 ; Vol. 109, No. 7.
@article{04c5076681ab48ceb56b08d844a0808f,
title = "Internal magnetic structure of dextran coated magnetite nanoparticles in solution using small angle neutron scattering with polarization analysis",
abstract = "For many applications, the internal magnetic domain structure of magnetic nanoparticles may play a critical role in the determination of their collective magnetic properties. Here we utilize polarization analyzed small angle neutron scattering (PASANS) to study the individual magnetic morphologies of an interacting aqueous Fe3O4 nanoparticle system. Our results demonstrate that the total magnetic moment of the colloid is randomized, as expected in low fields, while the nuclear structure is anisotropic. Model fits indicate that the magnetic domains within the nanoparticle core at 1.5 mT have dimensions that approximate those of the structural grains perpendicular to the field, but the domains extend over multiple grains along the field direction. The asymmetry in the magnetic domain formation in weak fields undoubtedly contributes to the magnetic anisotropy and thus to the enhanced heating reported for hyperthermia applications of these systems.",
author = "Krycka, {K. L.} and Jackson, {A. J.} and Borchers, {J. A.} and J. Shih and R. Briber and Robert Ivkov and C. Grttner and Dennis, {C. L.}",
year = "2011",
month = "4",
day = "1",
doi = "10.1063/1.3540589",
language = "English (US)",
volume = "109",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics Publising LLC",
number = "7",

}

TY - JOUR

T1 - Internal magnetic structure of dextran coated magnetite nanoparticles in solution using small angle neutron scattering with polarization analysis

AU - Krycka, K. L.

AU - Jackson, A. J.

AU - Borchers, J. A.

AU - Shih, J.

AU - Briber, R.

AU - Ivkov, Robert

AU - Grttner, C.

AU - Dennis, C. L.

PY - 2011/4/1

Y1 - 2011/4/1

N2 - For many applications, the internal magnetic domain structure of magnetic nanoparticles may play a critical role in the determination of their collective magnetic properties. Here we utilize polarization analyzed small angle neutron scattering (PASANS) to study the individual magnetic morphologies of an interacting aqueous Fe3O4 nanoparticle system. Our results demonstrate that the total magnetic moment of the colloid is randomized, as expected in low fields, while the nuclear structure is anisotropic. Model fits indicate that the magnetic domains within the nanoparticle core at 1.5 mT have dimensions that approximate those of the structural grains perpendicular to the field, but the domains extend over multiple grains along the field direction. The asymmetry in the magnetic domain formation in weak fields undoubtedly contributes to the magnetic anisotropy and thus to the enhanced heating reported for hyperthermia applications of these systems.

AB - For many applications, the internal magnetic domain structure of magnetic nanoparticles may play a critical role in the determination of their collective magnetic properties. Here we utilize polarization analyzed small angle neutron scattering (PASANS) to study the individual magnetic morphologies of an interacting aqueous Fe3O4 nanoparticle system. Our results demonstrate that the total magnetic moment of the colloid is randomized, as expected in low fields, while the nuclear structure is anisotropic. Model fits indicate that the magnetic domains within the nanoparticle core at 1.5 mT have dimensions that approximate those of the structural grains perpendicular to the field, but the domains extend over multiple grains along the field direction. The asymmetry in the magnetic domain formation in weak fields undoubtedly contributes to the magnetic anisotropy and thus to the enhanced heating reported for hyperthermia applications of these systems.

UR - http://www.scopus.com/inward/record.url?scp=79955444327&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79955444327&partnerID=8YFLogxK

U2 - 10.1063/1.3540589

DO - 10.1063/1.3540589

M3 - Article

VL - 109

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 7

M1 - 07B513

ER -