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Journal article

Magnetic anisotropy and quantized spin waves in hematite nanoparticles

By Klausen, Stine Nyborg1; Lefmann, Kim1,2,3; Lindgård, Per-Anker1,2,3; Kuhn, Luise Theil1,4,5; Bahl, Christian Robert Haffenden1,5,6; Frandsen, Cathrine7,8; Mørup, Steen8; Roessli, B.9; Cavadini, N.9; Niedermayer, C.9

From

Risø National Laboratory for Sustainable Energy, Technical University of Denmark1

Nano-Microstructures in Materials, Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2

Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark3

Electroceramics, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark4

Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark5

Thermo Ceramics, Fuel Cells and Solid State Chemistry Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark6

Quantum Physics and Information Technology, Department of Physics, Technical University of Denmark7

Department of Physics, Technical University of Denmark8

Paul Scherrer Institute9

We report on the observation of high-frequency collective magnetic excitations, (h) over bar omegaapproximate to1.1 meV, in hematite (alpha-Fe2O3) nanoparticles. The neutron scattering experiments include measurements at temperatures in the range 6-300 K and applied fields up to 7.5 T as well as polarization analysis.

We give an explanation for the field- and temperature dependence of the excitations, which are found to have strongly elliptical out-of-plane precession. The frequency of the excitations gives information on the magnetic anisotropy constants in the system. We have in this way determined the temperature dependence of the magnetic anisotropy, which is strongly related to the suppression of the Morin transition in nanoparticles of hematite.

Further, the localization of the signal in both energy and momentum transfer brings evidence for finite-size quantization of spin waves in the system.

Language: English
Year: 2004
ISSN: 1550235x , 10980121 , 01631829 and 24699950
Types: Journal article
DOI: 10.1103/PhysRevB.70.214411
ORCIDs: Kuhn, Luise Theil , Bahl, Christian Robert Haffenden , Frandsen, Cathrine and 0000-0003-4282-756X
Keywords

ALPHA-FE2O3 CLUSTERS INELASTIC NEUTRON-SCATTERING WIRES

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