Abstract
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.
Original language | English |
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Journal | Physica B: Condensed Matter |
Volume | 350 |
Issue number | Suppl. 1 |
Pages (from-to) | e217-e219 |
ISSN | 0921-4526 |
DOIs | |
Publication status | Published - 2004 |
Event | 3rd European Conference on Neutron Scattering - Montpellier, France Duration: 3 Sept 2003 → 6 Sept 2003 Conference number: 3 |
Conference
Conference | 3rd European Conference on Neutron Scattering |
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Number | 3 |
Country/Territory | France |
City | Montpellier |
Period | 03/09/2003 → 06/09/2003 |