[en] The magnetic structure and magnetic excitations in nanocrystalline Tb have been investigated by neutron diffraction and neutron spectroscopy. This is a report on the long-range magnetic order and the magnetic excitations in a nanocrystalline elemental rare earth. Refinement of the neutron-diffraction data reveals an “average” magnetic structure of each crystallite which contains a significant out-of-plane component to the magnetic moment as well as a suppression of the high-temperature antiferromagnetic phase observed for coarse-grained Tb. The inelastic-neutron-scattering measurements reveal the presence of a magnetic excitation of approximately 10 meV at 2.5 K. The excitation energy decreases with increasing temperature. The origins of this excitation are discussed with particular reference to the magnetic modes at the zone center observed for single-crystal Tb.
Disciplines :
Physique
Identifiants :
UNILU:UL-ARTICLE-2010-506
Auteur, co-auteur :
Vecchini, C.; CNR-INFM S3, Dipartimento di Fisica, Università di Modena e Reggio Emilia, Italy
Moze, O.; CNR-INFM S3, Dipartimento di Fisica, Università di Modena e Reggio Emilia, Italy
Hoser, A.; Institut für FestkoerperForschung, Forschungzentrum Jülich, Germany
Prager, M.; Institut für FestkoerperForschung, Forschungzentrum Jülich, Germany
Argyriou, D.; Berlin Neutron Scattering Center, Hahn Meitner Institut, Germany
MICHELS, Andreas ; Paul Scherrer Institute, Switzerland/Technische Physik, Universität des Saarlandes, Germany
Roessli, B.; Laboratory for Neutron Scattering, Switzerland/Paul Scherrer Institute, Switzerland
Weissmüller, J.; Institut für Nanotechnologie, Forschungzentrum Karlsruhe, Germany
Lemier, C.; Institut für Nanotechnologie, Forschungzentrum Karlsruhe, Germany
Viswanath, R. N.
Langue du document :
Anglais
Titre :
A neutron-scattering investigation of the magnetic structure and magnetic excitations in nanocrystalline Tb
Date de publication/diffusion :
2006
Titre du périodique :
Journal of Applied Physics
ISSN :
0021-8979
Maison d'édition :
American Institute of Physics, Melville, Etats-Unis - New York
