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Title: Infrared nano-spectroscopy of ferroelastic domain walls in hybrid improper ferroelectric Ca3Ti2O7

Journal Article · · Nature Communications
ORCiD logo [1];  [2];  [1]; ORCiD logo [3];  [4]; ORCiD logo [4]; ORCiD logo [1];  [1];  [1]; ORCiD logo [5]; ORCiD logo [6];  [7];  [8]; ORCiD logo [9];  [10];  [5]; ORCiD logo [1]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. New Jersey Institute of Technology, Newark, NJ (United States); Cornell Univ., Ithaca, NY (United States); Univ. of California, Merced, CA (United States)
  3. Univ. of Colorado, Boulder, CO (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  4. Rutgers Univ., Piscataway, NJ (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  6. Pohang Accelerator Lab. (PAL) (Korea, Republic of); Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
  7. Univ. of Colorado, Boulder, CO (United States)
  8. Rutgers Univ., Piscataway, NJ (United States); Pohang Accelerator Lab. (PAL) (Korea, Republic of); Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
  9. Cornell Univ., Ithaca, NY (United States)
  10. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division (SC-22.3 ); US Army Research Office (ARO); National Research Foundation of Korea (NRF)
Grant/Contract Number:
SC0012704; FG02-01ER45885; AC02-05CH11231; W911NF-10-1-0345; SC0008807; 2016K1A4A4A01922028
OSTI ID:
1579491
Alternate ID(s):
OSTI ID: 1580986
Report Number(s):
BNL-212398-2019-JAAM
Journal Information:
Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Optical studies of ferroelectric and ferroelastic domain walls journal February 2020

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