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Polarization-dependent electrocaloric and pyroelectric effects in ferroelectric BaTiO3 thin films

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/5.0143045· OSTI ID:1969334
 [1];  [2];  [2];  [3];  [4]
  1. University of Illinois, Chicago, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Materials Science Division; Laboratory for Oxide Research and Education, Chicago, IL (United States)
  2. Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Barcelona (Spain)
  3. Argonne National Laboratory (ANL), Argonne, IL (United States). Materials Science Division
  4. University of Illinois, Chicago, IL (United States); Laboratory for Oxide Research and Education, Chicago, IL (United States)

In this paper we examine the influence of controllable polarization reversal and built-in electric fields on pyroelectric and electrocaloric effects in a BaTiO3 thin film using a modified indirect method. We find that the magnitude of the sample's change in polarization with temperature is sensitive to the degree of polarization reversal. The pyroelectric response is small at low fractions of switched polarization and grows larger by several factors as larger fractions of polarization are reversed. This polarization reversal-sensitive pyroelectric behavior is the result of an internal built-in field, which has the effect of destabilizing low fractions of switched polarization and producing diminished pyroelectric effect. Greater fractions of switched polarization are more stable against backswitching and permit a larger pyroelectric response. Our findings highlight a characterization method for polarization-dependent pyroelectric effects in ferroelectric thin films, where built-in field effects are also present.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); Spanish Ministry of Science and Innovation (MICINN); University of Illinois, Chicago; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1969334
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 10 Vol. 122; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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