Dynamics in γ-Fe2O3 nanoparticles studied by time-of-flight polarized neutron scattering

被引：4
|
作者：
Kuhn, L. Theil [1 ]
Lefmann, K. [1 ]
Klausen, S. N. [1 ]
Ronnow, H. M. [2 ]
Murani, A. [2 ]
Stewart, R. [2 ]
机构：
[1] Riso Natl Lab, Dept Mat Res, DK-4000 Roskilde, Denmark
[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
来源：
PHYSICA B-CONDENSED MATTER | 2004年 / 350卷 / 1-3期
关键词：
Inelastic neutron scattering; Magnetic nanoparticles; Phonons and vibrational states in nanoscale materials;
D O I：
10.1016/j.physb.2004.03.054
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The inelastic neutron-scattering signal from magnetic nanoparticles contains information on magnetic dynamics like superparamagnetic relaxation and collective magnetic excitations. Often another, very broad quasi-elastic component is observed in addition. We have studied this quasi-elastic neutron signal from 4 nm ferrimagnetic maghemite (gamma-Fe(2)O(3)) particles, and by means of time-of-flight polarised neutron scattering we have identified the source of (most of) this signal to be water adsorbed at the surface of the nanoparticles. A minor part of the signal has its origin in dynamics of disordered surface spins and vibrations of individual nanoparticles. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码：E217 / E219
页数：3
相关论文
共 50 条
  • [1] Magnetic properties of nano-scale hematite, α-Fe2O3, studied by time-of-flight inelastic neutron spectroscopy
    Hill, Adrian H.
    Jacobsen, Henrik
    Stewart, J. Ross
    Jiao, Feng
    Jensen, Niels P.
    Holm, Sonja L.
    Mutka, Hannu
    Seydel, Tilo
    Harrison, Andrew
    Lefmann, Kim
    JOURNAL OF CHEMICAL PHYSICS, 2014, 140 (04):
  • [2] Magnetic dynamics of small α-Fe2O3 and NiO particles studied by neutron scattering
    Lefmann, K
    Bodker, F
    Hansen, MF
    Vázquez, H
    Christensen, NB
    Lindgård, PA
    Clausen, KN
    Morup, S
    EUROPEAN PHYSICAL JOURNAL D, 1999, 9 (1-4): : 491 - 494
  • [3] Magnetic dynamics of small α-Fe2O3 and NiO particles studied by neutron scattering
    K. Lefmann
    F. Bodker
    M.F. Hansen
    H. Vázquez
    N.B. Christensen
    P.-A. Lindgård
    K.N. Clausen
    S. Mørup
    The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics, 1999, 9 : 491 - 494
  • [4] Spin excitations in cubic maghemite nanoparticles studied by time-of-flight neutron spectroscopy
    Disch, S.
    Hermann, R. P.
    Wetterskog, E.
    Podlesnyak, A. A.
    An, K.
    Hyeon, T.
    Salazar-Alvarez, G.
    Bergstrom, L.
    Brueckel, Th.
    PHYSICAL REVIEW B, 2014, 89 (06):
  • [5] LOW-FREQUENCY DYNAMICS OF PROTEINS STUDIED BY NEUTRON TIME-OF-FLIGHT SPECTROSCOPY
    CUSACK, S
    SMITH, J
    FINNEY, J
    KARPLUS, M
    TREWHELLA, J
    PHYSICA B & C, 1986, 136 (1-3): : 256 - 259
  • [6] LOW FREQUENCY DYNAMICS OF PROTEINS STUDIED BY NEUTRON TIME-OF-FLIGHT SPECTROSCOPY.
    Cusack, Stephen
    Smith, Jeremy
    Finney, John
    Karplus, Martin
    Trewhella, Jill
    Physica B: Physics of Condensed Matter & C: Atomic, Molecular and Plasma Physics, Optics, 1985, 136 (1-3): : 256 - 259
  • [7] Neutron time-of-flight measurements of diffuse scattering
    Keen, D.A.
    Harris, M.J.
    David, W.I.F.
    Physica B: Condensed Matter, 1997, 241-243 : 201 - 203
  • [8] NEW TIME-OF-FLIGHT ANALYSER FOR NEUTRON SCATTERING
    HALL, JW
    NUCLEAR INSTRUMENTS & METHODS, 1971, 92 (01): : 51 - &
  • [9] Neutron time-of-flight measurements of diffuse scattering
    Keen, DA
    Harris, MJ
    David, WIF
    PHYSICA B, 1997, 241 : 201 - 203
  • [10] Surface effects in α-Fe2O3 nanoparticles studied by ILEEMS and TMS
    Van Cromphaut, C.
    de Resende, V. G.
    De Grave, E.
    Vandenberghe, R. E.
    HYPERFINE INTERACTIONS, 2009, 191 (1-3): : 167 - 171
12345