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Regensburg 2019 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 11: Multiferroics and Magnetoelectric coupling I (joint session MA/KFM)

KFM 11.1: Invited Talk

Tuesday, April 2, 2019, 14:00–14:30, H37

Magnetoelectric Inversion of Domain Patterns — •Naëmi Leo1,2,3, Vera Carolus4, Jonathan White3, Michel Kenzelmann3, Matthias Hudl5, Pierre Toledano6, Takashi Honda7, Tsuyoshi Kimura8, Sergey Ivanov9, Matthias Weil10, Thomas Lottermoser2, Dennis Meier11, and Manfred Fiebig21CIC nanoGUNE, Spain — 2ETH Zürich, Switzerland — 3Paul Scherrer Institute, Switzerland — 4Bonn University, Germany — 5Stockholm University, Sweden — 6Université de Picardie, France — 7High Energy Accelerator Research Organization (KEK), Japan — 8University of Tokyo, Japan — 9Karpov Insitute of Physical Chemistry, Russia — 10TU Wien, Austria — 11Norwegian University of Science and Technology, Norway

The global inversion of an inhomogeneous distribution of ferromagnetic or ferroelectric domains within a material is surprisingly difficult: Field poling creates a single-domain state, and piece-by-piece inversion using a scanning tip is impractical. Here we report inversion of entire domain patterns in the magnetoelectric material Co3TeO6 and the multiferroic material Mn2GeO4. In these materials, an applied magnetic field reverses the magnetization or polarization, respectively, of each domain, but leaves the overall domain pattern intact. This effect originates from a trilinear coupling term containing a "hidden" order parameter which retains the relative orientation of the field-driven and the observed order parameters. Such behaviour might also occur in other complex materials where coexisting order parameters are available for combination.

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