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
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