Ferroelectrics, with their spontaneous switchable electric polarization and strong coupling between their electrical, mechanical, thermal, and optical responses, provide functionalities crucial for a diverse range of applications. Over the past decade, there has been significant progress in epitaxial strain engineering of oxide ferroelectric thin films to control and enhance the nature of ferroelectric order, alter ferroelectric susceptibilities, and to create new modes of response which can be harnessed for various applications. This review aims to cover some of the most important discoveries in strain engineering over the past decade and highlight some of the new and emerging approaches for strain control of ferroelectrics. We discuss how these new approaches to strain engineering provide promising routes to control and decouple ferroelectric susceptibilities and create new modes of response not possible in the confines of conventional strain engineering. To conclude, we will provide an overview and prospectus of these new and interesting modalities of strain engineering helping to accelerate their widespread development and implementation in future functional devices.
Bibliographical noteFunding Information:
The authors acknowledges support from the Army Research Office under grant W911NF-14-1-0104, the Department of J. Phys.: Condens. Matter 28 (2016) 263001 Energy under grant DE-SC0012375, the National Science Foundation under grants DMR-1124696, DMR-1451219, CMMI-1434147, and OISE-1545907, the Office of Naval Research under grant N00014-10-1-0525, and the Air Force Office of Scientific Research under grant FA9550-12-1-0471.
- Thin films