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FM: Fachverband Funktionsmaterialien
FM 8: Multiferroics and Magnetoelectric Coupling (joint session MA/FM)
FM 8.2: Vortrag
Dienstag, 10. März 2026, 09:45–10:00, POT/0112
Competition Between Multiferroic and Magnetic Soliton Lattice States in DyFeO3 — •Nikita Andriushin1, Stanislav Nikitin2, Oystein Fjellvag1,3, Ekaterina Pomjakushina2, Alexandra Turrini2, Sergey Artyukhin4, Christof Schneider2, and Maxim Mostovoy5 — 1TU Dresden, Germany — 2PSI, Switzerland — 3IFE, Norway — 4IIT, Italy — 5University of Groningen, The Netherlands
Simultaneous breaking of time-reversal and inversion symmetries in multiferroics couples ferroelectricity to magnetism and produces unusual phenomena relevant for next-generation electronics. A notable case is DyFeO3, which under magnetic fields shows a giant linear magnetoelectric response and a large spontaneous polarization arising from coexisting Fe and Dy orders. Using high-resolution neutron diffraction, we demonstrate that at zero field DyFeO3 hosts an incommensurate magnetic soliton lattice formed by spatially ordered Dy domain walls with an average size of 231(8) Å. Long-range interactions between these walls are mediated by magnons in the Fe subsystem, analogous to a Yukawa force. An applied magnetic field destroys the incommensurate order, restores the linear magnetoelectric response, and stabilizes the ferroelectric state. The magnetic domain walls carry electric charge, and the soliton array dimerizes when both electric and magnetic fields are applied. Simulations using experimental parameters indicate that competition between ferroelectric and incommensurate states can be effectively tuned by an electric field.
Keywords: neutron scattering; multiferroic; frustrated magnet; soliton lattice