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|Title:||Strain-polarization Coupling Mechanism of Enhanced Conductivity at the Grain Boundaries in BiFeO3thin Films|
Reis, S. P.
Kalinin, S. V.
Araujo, E. B.
|Citation:||Strain-polarization Coupling Mechanism of Enhanced Conductivity at the Grain Boundaries in BiFeO3thin Films / D. Alikin, Y. Fomichov, S. P. Reis et al. // Applied Materials Today. — 2020. — Vol. 20. — 100740.|
|Abstract:||Charge transport across the interfaces in complex oxides attracts a lot of attention because it allows creating novel functionalities useful for device applications. It has been observed that movable domain walls in epitaxial BiFeO3 films possess enhanced conductivity that can be used for reading out in ferroelectric-based memories. In this work, the relation between the polarization, strain and conductivity in sol-gel BiFeO3 films with special emphasis on grain boundaries as natural interfaces in polycrystalline ferroelectrics is investigated. The interaction between polarization and grain boundaries occuring at elevated temperatures during or after material sintering stage leads to the formation of branched network of highly conductive grain boundaries with the electrical conductivity about two orders higher than in the bulk. At room temperature, these conductive traces stabilized by the defects remain and do not change upon polarization switching. These collective states provide further insight into the physics of complex oxide ferroelectrics and may strongly affect their practical applications, because reveal an additional mechanism of the leakage current in such systems. © 2020.|
|metadata.dc.description.sponsorship:||Piezoresponse force microscopy and conductive atomic force microscopy investigations were made possible by the Russian Science Foundation (grant 19–72–10076). The equipment of the Ural Center for Shared Use “Modern nanotechnology” UrFU was used. Part of this work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the FCT/MEC and, when appropriate, cofinanced by FEDER under the PT2020 Partnership Agreement. For the financial support, we also express our gratitude to the Brazilian agencies: Fundação de Amparo à Pesquisa do Estado de São Paulo – FAPESP (Project N° 2017/13769–1) and Conselho Nacional de Desenvolvimento Científico e Tecnológico – CNPq (Research Grant 304604/2015–1 and Project N° 400677/2014–8) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES (CAPES-PRINT Project: 88881.310513/2018–01). This project has received funding from the Marie Sklodowska-Curie Research and Innovation Staff Exchange program (grant agreement # 778070). Part of the work (SVK) was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility and supported by DOE BES scientific user facility division.|
|RSCF project card:||19-72-10076|
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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