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MA: Fachverband Magnetismus

MA 19: Poster I

MA 19.13: Poster

Dienstag, 1. April 2014, 13:00–15:30, P1

Neutron diffraction and XMCD on YFe₂O_4−δ single crystals. — •Thomas Mueller¹, Yixi Su², Kirill Nemkovskiy², John Freeland³, David Keavney³, Richard A. Rosenberg³, and Manuel Angst¹ — ¹Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, 52425 Jülich, GERMANY — ²Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at MLZ Lichtenbergstraße 1, 85747 Garching, GERMANY — ³Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, USA

YFe₂O_4−δ is isostructural to LuFe₂O₄ the former primary example for a charge order multiferroic, but the ionic radius of Y is much larger compared to Lu, leading to completely different ordering phenomena. We have grown highly stoichiometric single crystals of YFe₂O_4−δ by the optical floating zone method, showing for the first time 3D charge and magnetic ordering. Here we present single crystal neutron diffraction performed at the DNS instrument at the MLZ, with full polarization analysis to distinguish magnetic from charge-order scattering and to determine the magnetic moment directions. We were able to identify contributions from three magnetic domains arranged in a 120^∘ pattern. XMCD measurements at 4-ID-C at the APS were performed to probe for orbital contributions and to get valance specific information about the magnetic moments.