Strain Driven Novel Layered Oxide Thin Films with Unique Functionalities
Abstract
Objective:The objective of this proposed research is to discover new and novel layered oxide phases, achieve better understanding of oxide interfaces and strain-driven phenomena, and establish new functionalities for various applications.Approach:The proposed research will build upon the group s recent success in designing and processing anew family of layered oxide structures with coexistence of ferroelectric and ferromagneticproperties (i.e., multiferroics). The PI proposes to research new branches as well as delve moreinto the fundamentals of the layered-structure formation. A unique in situ TEM (transmissionelectron microscopy) approach will be implemented for the fundamental formation mechanismstudies, including in situ annealing and in situ STM (scanning tunneling microscopy) forindentation and electrical measurement. This unique tool set will allow the team toexamine the thermal stability, phase stability, and electrical property variation under strain. Inaddition, high resolution aberration-corrected scanning transmission electron microscopy(STEM) / electron energy loss spectroscopy (EELS) characterization will be applied foranalyzing the atomic scale interface defects and bonding states that could be critical fortriggering the formation of these new layered phases. Finally, the team will demonstrate newfunctionalities in new layered oxide systems to lay a solid foundation for future devicesincorporating these novel layered oxides.SOW:1. Using pulsed layer deposition for material growth, explore new layered supercell structures based on materials design and tuning by processing conditions. Materials will include bismuth-based systems such as BiCrMnO, BiNiMnO, and BiFeMnO. 2. Understand the strain and interface effects on the formation of new layered structures (exploring the ultrathin film form and phase stability)3. Identify new functionalities and potential devices.Merit/Naval Relevance:Professor Wang was an ONR Young Investigator and PECASE awardee. She has established an impressive record since receiving her PhD in 2002. For example, during the calendar year 2015, her work received over 1400 citations. Her group made a recent breakthrough, with the discovery of supercell structures in bismuth oxides. The new supercell work for multiferroic materials proposed here could find applications in memories for future data storage devices with low power and small size. Multiferroics could be used as magnetic sensors. The new bandgap-tunable semiconductors could be applied in the Electromagnetic Maneuver Warfare focus area.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2016
- Source ID
- N000141612465
Entities
People
- Haiyan Wang
Organizations
- Office of Naval Research
- United States Navy
- University of Virginia