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 7.3: Vortrag

Montag, 5. September 2022, 15:50–16:10, H5

Electric-field control of oxygen defects and local transport properties in ErMnO3 — •Jiali He1, Ursula Ludacka1, Donald M. Evans1, Theodor S. Holstad1, Erik D. Roede1, Kasper A. Hunnestad1, Konstantin Shapovalov2, Zewu Yan3,4, Edith Bourret4, Antonius T. J. van Helvoort1, Sverre M. Selbach1, and Dennis Meier11NTNU Norwegian University of Science and Technology, Norway — 2Institute of Materials Science of Barcelona, Spain — 3ETH Zurich, Switzerland — 4Lawrence Berkeley National Laboratory, USA

The electronic properties of complex oxides can be tuned via oxygen defects, offering intriguing opportunities for controlling conductivity. Recently, anti-Frenkel defects moved into focus for minimally invasive property engineering, and their creation makes it possible to adjust the electronic properties without long-range ionic migration or stoichiometry changes. Here, we present a detailed analysis of the electric-field-driven formation and time-voltage-dependent evolution of anti-Frenkel defects in hexagonal ErMnO3. By combining atomic force microscopy and scanning electron microscopy, we investigate the local electronic transport properties associated with the written defects, complemented by numerical simulations. The study reveals that oxygen interstitial - vacancy pairs can be split under an applied electric field. This splitting leads to spatially separated and well-defined vacancy- and interstitial-rich regions, forming a bipolar nanoscale junction. The results provide new insight into the electric-field-driven ionic migration in ErMnO3 and defects physics in functional oxides.

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