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Title: Chemical state evolution in ferroelectric films during tip-induced polarization and electroresistive switching

Journal Article · · ACS Applied Materials and Interfaces
 [1];  [1];  [2];  [3];  [4];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); ETH Zurich, Zurich (Switzerland)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of New South Wales, Sydney, NSW (Australia)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Domain formation and ferroelectric switching is fundamentally inseparable from polarization screening, which on free surfaces can be realized via band bending and ionic adsorption. In the latter case, polarization switching is intrinsically coupled to the surface electrochemical phenomena, and the electrochemical stage can control kinetics and induce long-range interactions. However, despite extensive evidence toward the critical role of surface electrochemistry, little is known about the nature of the associated processes. Here we combine SPM tip induce polarization switching and secondary ion mass spectrometry to explore the evolution of chemical state of ferroelectric during switching. Surprisingly, we find that even pristine surfaces contain ions (e.g., Cl-) that are not anticipated based on chemistry of the system and processing. In the ferroelectric switching regime, we find surprising changes in surface chemistry, including redistribution of base cations. At higher voltages in the electroforming regime significant surface deformation was observed and associated with a strong ion intermixing.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; AC02-05CH11231
OSTI ID:
1334478
Alternate ID(s):
OSTI ID: 1474977
Journal Information:
ACS Applied Materials and Interfaces, Vol. 8, Issue 43; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Piezoresponse force microscopy and nanoferroic phenomena journal April 2019
Materials science in the artificial intelligence age: high-throughput library generation, machine learning, and a pathway from correlations to the underpinning physics journal July 2019
Deep data analysis via physically constrained linear unmixing: universal framework, domain examples, and a community-wide platform journal April 2018
Epitaxial TiO x Surface in Ferroelectric BaTiO 3 : Native Structure and Dynamic Patterning at the Atomic Scale journal June 2019
Ferroelectric or non-ferroelectric: Why so many materials exhibit “ferroelectricity” on the nanoscale journal June 2017
Surface charged species and electrochemistry of ferroelectric thin films journal January 2019
Subtractive fabrication of ferroelectric thin films with precisely controlled thickness journal February 2018
Design and Manipulation of Ferroic Domains in Complex Oxide Heterostructures journal September 2019
Non-conventional mechanism of ferroelectric fatigue via cation migration journal July 2019
Design and Manipulation of Ferroic Domains in Complex Oxide Heterostructures text January 2019
Ferroelectric or non-ferroelectric: why so many materials exhibit ferroelectricity on the nanoscale preprint January 2017