Regensburg 2022 – scientific programme

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DS: Fachverband Dünne Schichten

DS 13: Thin Film Applications 2

DS 13.3: Talk

Wednesday, September 7, 2022, 10:00–10:15, H14

Tracking the evolution of polarization in BiFeO3-based devices — •Marvin Müller¹, Yen-Lin Huang², Saül Vélez³, Ramamoorthy Ramesh², Manfred Fiebig¹, and Morgan Trassin¹ — ¹Department of Materials, ETH Zurich, Switzerland — ²Department of Material Science and Engineering, University of California, Berkeley, USA — ³Department of Physics, Universidad Autónoma de Madrid, Spain

The integration of magnetoelectric multiferroics, hosting coexisting and coupled ferromagnetic and ferroelectric orders, into magnetoelectric spin-orbit logic devices holds promises for unprecedented performance and reduction of energy consumption by several orders of magnitude. While static properties such as the coercive electric field have been thoroughly studied and optimized, investigations on the evolution of the ferroic orders during electric-field switching cycles are sparse.

Here, we study the three-dimensional evolution of the net polarization in the technologically highly relevant magnetoelectric material La0.15Bi0.85FeO3. Using optical second-harmonic generation microscopy, we access the polarization of the films integrated in capacitor heterostructures operando. We demonstrate that electric-field training results in a spontaneous domain ordering and a giant enhancement of the net in-plane polarization in La0.15Bi0.85FeO3. Finally, we distinguish between the behavior of the in-plane and out-of-plane polarization during the electric poling. Our investigations thus give unprecedented insights into the polarization dynamics in integrated BiFeO3-based devices.