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MA: Fachverband Magnetismus
MA 56: Focus Session: (Anti)ferroic states – Magnetic and magnetoelectric III (joint session FM/MA)
MA 56.5: Vortrag
Freitag, 13. März 2026, 11:00–11:15, BEY/0E40
Optical manipulation of multiferroic phases in BiFeO3 thin films — •Bixin Yan1, Lauren J. Riddiford1,2, Ales Hrabec1,2, Annika Mechnich3, Christian L. Degen3, Manfred Fiebig1, and Morgan Trassin1 — 1Department of Materials, ETH Zurich, Switzerland — 2PSI Center for Neutron and Muon Sciences, Paul Scherrer Institute PSI, Switzerland — 3Department of Physics, ETH Zurich, Switzerland
Employing light as a means of actively tuning material properties unlocks the potential for non-invasive, remote, and macroscopic control over technology-relevant functionalities. In our work, we demonstrate optical control over multiferroic phases in prototypical magnetoelectric BiFeO3 (BFO) thin films, utilizing above-bandgap UV light illumination. Taking advantage of the enhanced response at the strain-driven morphotropic phase boundary, we show that by modifying the electrostatic boundary conditions with photoinduced charge carriers, the rhombohedral-like (R-like) phase of BFO can be selectively suppressed within the tetragonal-like (T-like) phase BFO matrix. Furthermore, the electronic origin of such an optical response permits a pronounced polarization-dependent R-to-T-phase conversion. Finally, using scanning nitrogen-vacancy magnetometry, we correlate optically induced ferroelectric phase conversion with a change from uncompensated magnetic ordering to G-type antiferromagnetic ordering. Our work thus presents a novel approach to writing multiferroic states, which is key to magnetoelectric oxide electronics.
Keywords: Epitaxial thin film; Multiferroic; Magnetoelectric; Bismuth Ferrite (BiFeO3,BFO)