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

doi:10.1016/j.physb.2004.03.054

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 journal › Conference article › Research › peer-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 language	English
Journal	Physica B: Condensed Matter
Volume	350
Issue number	Suppl. 1
Pages (from-to)	e217-e219
ISSN	0921-4526
DOIs	https://doi.org/10.1016/j.physb.2004.03.054
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
Number	3
Country/Territory	France
City	Montpellier
Period	03/09/2003 → 06/09/2003

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10.1016/j.physb.2004.03.054

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Cite this

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title = "Dynamics in γ-Fe2O3 nanoparticles studied by time-of-flight polarized neutron scattering",

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. ",

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AU - Kuhn, L.T.

AU - Lefmann, K.

AU - Klausen, S.N.

AU - Rønnow, H.M.

AU - Murani, A.

AU - Stewart, R.

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AB - 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.

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DO - 10.1016/j.physb.2004.03.054

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SP - e217-e219

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

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