Yudin, P., Duchon, J., Pacherova, O., Klementova, M., Kocourek, T., Dejneka, A., & Tyunina, M. (2021) Ferroelectric phase transitions induced by a strain gradient. Physical Review Research 3(3), 033213, https://doi.org/10.1103/physrevresearch.3.033213
Ferroelectric phase transitions induced by a strain gradient
|Author:||Yudin, P.1,2; Duchon, J.1; Pacherova, O.1;|
1Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 18221 Praha 8, Czech Republic
2Kutateladze Institute of Thermophysics, Siberian Branch of Russian Academy of Science, Lavrent’eva Ave. 1, Novosibirsk 630090, Russia
3Microelectronics Research Unit, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
|Online Access:||PDF Full Text (PDF, 2.4 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2021121660861
American Physical Society,
|Publish Date:|| 2021-12-16
In perovskite oxide ferroelectrics, gradients of lattice strain are known to induce nanoscale topological structures, leading to novel or enhanced functionality. Here, we experimentally detect and theoretically analyze thickness distribution of structural properties in epitaxial Pb0.5 Sr0.5 TiO3 films grown on (001) SrTiO3 substrates. We show that the relaxation of substrate-imposed stress produces a strain gradient, which leads to the formation of distinct ferroelectric phases as a function of distance from the film-substrate interface within the same film. Charge carriers trapped at phase boundaries stabilize the induced phases and manifest themselves under electric field. Crosstalk between the phases, where polarization may rotate in one phase and invert in the other one, opens perspectives for advanced ferroelectric thin film devices.
Physical review research
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
114 Physical sciences
216 Materials engineering
213 Electronic, automation and communications engineering, electronics
This paper was supported in part by the Operational Program Research, Development and Education, financed by the European Structural and Investment Funds and the Czech Ministry of Education, Youth, and Sports (Project No. SOLID21, CZ.02.1.01/0.0/0.0/16_019/0000760), and the Czech Science Foundation (Grants No. 19-09671S and No. 21-09685S). We acknowledge CzechNanoLab Research Infrastructure supported by MEYS CR (LM2018110). P.Y. acknowledges the Russian Foundation for Basic Research, Grant No. 19-02-00938, simulation of hysteresis loops was carried out under state contract with IT SB RAS (121031200084-2).
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