Dynamics in γ-Fe2O3 nanoparticles studied by time-of-flight polarized neutron scattering
| Autor: | L. Theil Kuhn, R. Stewart, H.M. Rønnow, A. Murani, K. Lefmann, S.N. Klausen |
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| Předmět: |
Materials science
Condensed matter physics Scattering Neutron diffraction Quasielastic neutron scattering Magnetic nanoparticles Electrical and Electronic Engineering Inelastic scattering Neutron scattering Condensed Matter Physics Small-angle neutron scattering Electronic Optical and Magnetic Materials Superparamagnetism |
| Zdroj: | University of Copenhagen |
| Popis: | 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 (γ-Fe2O3) 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. |
| Databáze: | OpenAIRE |
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