BROWSE

Related Researcher

Author's Photo

An, Kwangjin
Advanced Nanocatalysis Lab (An Lab)
Research Interests
  • Nanoparticle catalytsts, catalytic activity, selectivity, and stability, strong metal-support interactions, CO2 utilization, biomass conversion, Plastic Up-cycling

ITEM VIEW & DOWNLOAD

Spin excitations in cubic maghemite nanoparticles studied by time-of-flight neutron spectroscopy

Cited 2 times inthomson ciCited 2 times inthomson ci
Title
Spin excitations in cubic maghemite nanoparticles studied by time-of-flight neutron spectroscopy
Author
Disch, SHermann, RPWetterskog, EPodlesnyak, AAAn, KwangjinHyeon, TSalazar-Alvarez, GBergstrom, LBruckel, T
Keywords
MAGNETIC NANOPARTICLES; MOSSBAUER-SPECTRA; SCATTERING; DYNAMICS; PARTICLES; NANOCRYSTALS; GAMMA-FE2O3
Issue Date
2014-02
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v.89, no.6, pp.064402-1 - 064402-7
Abstract
We have determined the field dependence of collective magnetic excitations in iron oxide nanoparticles of cubic shape with 8.42(2) nm edge length and a narrow log normal size distribution of 8.2(2)% using time-of-flight neutron spectroscopy. The energy dependence of the uniform precession modes was investigated up to 5 T applied field and yields a Landé factor g=2.05(2) as expected for maghemite (γ-Fe2O3) nanoparticles. A large effective anisotropy field of BA,eff=0.45(16) T was determined, in excellent agreement with macroscopic measurements. This anisotropy is attributed to enhanced shape anisotropy in these monodisperse cubic nanoparticles. The combination of our results with macroscopic magnetization information provides a consistent view of the energy scales of superparamagnetic relaxation and collective magnetic excitations in magnetic nanoparticles. © 2014 American Physical Society.
URI
Go to Link
DOI
10.1103/PhysRevB.89.064402
ISSN
2469-9950
Appears in Collections:
ECHE_Journal Papers
Files in This Item:
PRB 2014,89,064402, Spin excitations in cubic maghemite NPs studied by time-of-flight neutron spectroscopy.pdf Download

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU