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MA: Fachverband Magnetismus

MA 45: Computational Magnetism

MA 45.11: Vortrag

Freitag, 21. März 2025, 12:15–12:30, H18

Magnetoelectric coupling in type-I multiferroics via domain walls — •Aditya Putatunda and Sergey Artyukhin — Istituto Italiano di Tecnologia, Genova, Italy 16123

Type-I multiferroics, where ferroelectricity (FE) and magnetism arise independently with a large FE polarization but often tend to have a much weaker coupling to spins, e.g.: prototypical BiFeO3. Electric polarization, arising from inversion breaking, causes structural modifications across polarization domains in such materials. Here we demonstrate an effective coupling mechanism caused due to such structural modifications which in turn modifies the magnetic exchanges between the ions using first-principles density functional calculations. Magnetic domain walls, generally more mobile than polarization walls, depending on the nature of the materials, experience an effectively attractive or repulsive potential due to these modified exchanges. Such a potential can be taken advantage of in driving magnetic domain walls by sweeping polarization domains using electric field, thus giving rise to a cross-coupling mechanism, a highly sought phenomenon for novel low-power device applications.

Keywords: Multiferroics; Magnetoelectricity; Domain walls; Magnetic exchanges