Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 7: Focus Session: Defects and Interfaces in Multiferroics 2

KFM 7.6: Vortrag

Montag, 5. September 2022, 17:05–17:25, H5

Manipulation of improper ferroelectric domains in Gd2(MoO4)3 using temperature, electric fields, and mechanical stress — •Ivan Ushakov1, Theodor Holstad1, Didier Perrodin2, Edith Bourret2, Thomas Tybell1, and Dennis Meier11Norwegian University of Science and Technology (NTNU), Norway — 2Lawrence Berkeley National Laboratory, USA

In improper ferroelectrics, the spontaneous polarization arises as a biproduct of magnetic or structural order, promoting the formation of domains and domain walls with unusual electronic transport phenomena and scaling behavior. Gd2(MoO4)3 is a classical example of an improper ferroelectric material where a structural instability leads to the formation of a polar axis.

Here, we expand previous mesoscale microscopy studies of the domain structure to the nanoscale. By using piezoresponse force microscopy, we image the patterns of ferroelectric and structural anti-phase domains in Gd2(MoO4)3. In addition to the established domain patterns, we resolve so far unexplored stripe-like nanodomains with a periodicity of about 60 nm. Temperature-dependent measurements show that the nanodomains are stable up to 70C. Furthermore, we demonstrate reversible switching of these nanodomains by local electric fields and their control via mechanical stress. Our findings provide new insight into the nanoscale domain-physics of Gd2(MoO4)3 and introduce novel opportunities for domain engineering in improper ferroelectrics.

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DPG-Physik > DPG-Verhandlungen > 2022 > Regensburg