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Laboratory for Neutron Scattering (LNS)
Einladung zu einem Seminar über
Neutronenstreuung
Date:
Monday, August 22, 2011, 09.00
Location:
Paul Scherrer Institut, Area West, Bldg. WHGA/121
Speaker:
Ivelisse M Cabrera,
Clarendon Laboratory, University of Oxford, U.K.
Polarized Neutron Scattering Studies of Multiferroic Ni3V2O8
Abstract
Polarized neutron scattering is a powerful technique that can unveil details of complex
magnetic structures not accessible through conventional scattering techniques.
New details about Ni3V2O8 (NVO) magnetic structures are revealed using unpolarized
and polarized neutron diffraction data. By complementing polarized neutrons with
electric polarization measurements, we demonstrate direct electric control of
multiferroic domains in NVO.
A comprehensive qualitative and quantitative analysis indicates that magnetic and
ferroelectric domains coincide at low temperatures and can be controlled by an external
electric field. Finally, I will present evidence for an unusual 'memory effect' in NVO's
multiferroic phase, where a previously electrically-polarized sample reestablishes its
polarization direction upon exiting and re-entering the multiferroic phase in the absence
of a field.
Contact: Christian Rüegg, WHGA/149, Tel. 056/310 47 78, [email protected]
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