journal article·2020-10-01Open access

Electrically driven transient and permanent phase transformations in highly strained epitaxial BiFeO3 thin films

Hyeon Jun Lee, Jeongyong Kim, Seung Hyun Hwang, Hyeokmin Choe, Semen Gorfman, Yeong-Jae Heo, Su Yong Lee, Pierre-Eymeric Janolin, Igor Kornev, Tobias U. Schülli, Carsten Richter, Joo-Hyoung Lee, Ullrich Pietsch, Chan-Ho Yang, Ji Young Jo

APL Materials· Volume 8· Issue 10

Abstract

Electric-field-driven phase transformation phenomena in multiferroic BiFeO3 are directly linked to the functionalities of electronic devices based on multiferroic materials. Understanding how the transformation evolves at the nanoscale under the influence of an electric field will provide fascinating insights into key parameters that utilize the transformation features. Here, we report both the electric-field-driven transient and permanent phase transformations in highly strained BiFeO3 thin films and their transformation dynamics at the nanoscale. We found that two distinct transient and permanent phase transformations were triggered below and above a coercive voltage of the polymorphic phase, indicating that ferroelectric polarization switching could promote permanent phase transformations. We also found that the transient transformations evolve via complex phase boundary motions between the coexisting phases, whereas permanent transformations occurred via nucleation of the other phases.
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Research context

OpenAlex topics: Multiferroics and related materials · Ferroelectric and Piezoelectric Materials · Advanced Sensor and Energy Harvesting Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Materials Science and Engineering, Gwangju Institute of Science and Technology 1 , Gwangju 61005, South Korea

Department of Physics, Korea Advanced Institute of Science and Technology 2 , Daejeon 34141, South Korea

Materials Science and Engineering Division, National Institute of Standards and Technology 3 , Gaithersburg, Maryland 20899, USA

Department of Materials Science and Engineering, Tel Aviv University 4 , Tel Aviv 6997801, Israel

Pohang Accelerator Laboratory, Pohang University of Science and Technology 5 , Pohang 37676, South Korea

Université Paris-Saclay, CentraleSupélec, CNRS, Laboratoire SPMS 6 , 91190 Gif-sur-Yvette, France

ESRF-The European Synchrotron 7 , 71 Avenue des Martyrs, 38043 Grenoble, France

Department of Physics, University of Siegen Emmy-Noether-Campus 8 , Walter-Flex-Str. 3, Siegen 57072, Germany

Funding

National Research Foundation of Korea · Ministry of Health and Welfare

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