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

L.T. Kuhn, K. Lefmann, S.N. Klausen, H.M. Rønnow, A. Murani, R. Stewart

    Research output: Contribution to journalConference articleResearchpeer-review

    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 languageEnglish
    JournalPhysica B: Condensed Matter
    Volume350
    Issue numberSuppl. 1
    Pages (from-to)e217-e219
    ISSN0921-4526
    DOIs
    Publication statusPublished - 2004
    Event3rd European Conference on Neutron Scattering - Montpellier, France
    Duration: 3 Sep 20036 Sep 2003
    Conference number: 3

    Conference

    Conference3rd European Conference on Neutron Scattering
    Number3
    Country/TerritoryFrance
    CityMontpellier
    Period03/09/200306/09/2003

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