Berlin 2024 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 15: Multiferroics and Magnetoelectric Coupling (joint session MA/KFM)
KFM 15.1: Vortrag
Mittwoch, 20. März 2024, 15:00–15:15, EB 407
Real-time imaging of nonequilibrium domain evolution into a multiferroic phase — •Jan Gerrit Horstmann1, Yannik Zemp1, Ehsan Hassanpour Yesaghi1, Thomas Lottermoser1, Mads C. Weber2, and Manfred Fiebig1 — 1Dept. of Materials, ETH Zurich, Switzerland — 2Institut des Molécules et Matériaux du Mans, Le Mans Université, France
We investigate the dynamics of magnetic domain formation across spin-reorientation transitions in multiferroic Dy0.7Tb0.3FeO3. Combining Faraday imaging at kHz frame rates with fast optical excitation we find that thermal quenches of the system can be harnessed to imprint the characteristic bubble domain pattern of the weak ferromagnetic order at elevated temperatures onto the low-temperature multiferroic phase. We identify the quenching rate across the different spin reorientation transitions as the decisive parameter governing the domain memory and the formation of metastable domain states forbidden in thermal equilibrium. Our results highlight the potential of optical stimuli for the switching and control of multiferroic domain structures, enabling the creation of new functional states via nonequilibrium pathways.
Keywords: Multiferroics; Nonequilibrium dynamics; Magnetic imaging; Phase transitions