Infrared nano-spectroscopy of ferroelastic domain walls in hybrid improper ferroelectric Ca3Ti2O7
Document Type
Article
Publication Date
12-1-2019
Abstract
Ferroic materials are well known to exhibit heterogeneity in the form of domain walls. Understanding the properties of these boundaries is crucial for controlling functionality with external stimuli and for realizing their potential for ultra-low power memory and logic devices as well as novel computing architectures. In this work, we employ synchrotron-based near-field infrared nano-spectroscopy to reveal the vibrational properties of ferroelastic (90∘ ferroelectric) domain walls in the hybrid improper ferroelectric Ca3Ti2O7. By locally mapping the Ti-O stretching and Ti-O-Ti bending modes, we reveal how structural order parameters rotate across a wall. Thus, we link observed near-field amplitude changes to underlying structural modulations and test ferroelectric switching models against real space measurements of local structure. This initiative opens the door to broadband infrared nano-imaging of heterogeneity in ferroics.
Identifier
85075329992 (Scopus)
Publication Title
Nature Communications
External Full Text Location
https://doi.org/10.1038/s41467-019-13066-9
e-ISSN
20411723
PubMed ID
31748506
Issue
1
Volume
10
Grant
W911NF-10-1-0345
Fund Ref
U.S. Department of Energy
Recommended Citation
Smith, K. A.; Nowadnick, E. A.; Fan, S.; Khatib, O.; Lim, S. J.; Gao, B.; Harms, N. C.; Neal, S. N.; Kirkland, J. K.; Martin, M. C.; Won, C. J.; Raschke, M. B.; Cheong, S. W.; Fennie, C. J.; Carr, G. L.; Bechtel, H. A.; and Musfeldt, J. L., "Infrared nano-spectroscopy of ferroelastic domain walls in hybrid improper ferroelectric Ca3Ti2O7" (2019). Faculty Publications. 7182.
https://digitalcommons.njit.edu/fac_pubs/7182
