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 Leo^1,2,3, Vera Carolus⁴, Jonathan White³, Michel Kenzelmann³, Matthias Hudl⁵, Pierre Toledano⁶, Takashi Honda⁷, Tsuyoshi Kimura⁸, Sergey Ivanov⁹, Matthias Weil¹⁰, Thomas Lottermoser², Dennis Meier¹¹, and Manfred Fiebig² — ¹CIC 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.