Terahertz reading of ferroelectric domain wall dielectric switching
Authors
Zhang, ManChen, Zhe
Yue, Yajun
Chen, Tao
Yan, Zhongna
Jiang, Qinghui
Yang, Bin
Eriksson, Mirva
Tang, Jianhua
Zhang, Dou
Shen, Zhijian
Abrahams, Isaac
Yan, Haixue
Affiliation
University of Chester; Queen Mary University of London; South-Central University for Nationalities; Central South University; Huazhong University of Science and Technology; Stockholm University; The University of Manchester;Publication Date
2021-03-08
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Ferroelectric domain walls (DWs) are important nano scale interfaces between two domains. It is widely accepted that ferroelectric domain walls work idly at terahertz (THz) frequencies, consequently discouraging efforts to engineer the domain walls to create new applications that utilise THz radiation. However, the present work clearly demonstrates the activity of domain walls at THz frequencies in a lead free Aurivillius phase ferroelectric ceramic, Ca0.99Rb0.005Ce0.005Bi2Nb2O9, examined using THz time domain spectroscopy (THz-TDS). The dynamics of domain walls are different at kHz and THz frequencies. At low frequencies, domain walls work as a group to increase dielectric permittivity. At THz frequencies, the defective nature of domain walls serves to lower the overall dielectric permittivity. This is evidenced by higher dielectric permittivity in the THz band after poling, reflecting decreased domain wall density. An elastic vibrational model has also been used to verify that a single frustrated dipole in a domain wall represents a weaker contribution to the permittivity than its counterpart within a domain. The work represents a fundamental breakthrough in understanding dielectric contributions of domain walls at THz frequencies. It also demonstrates that THz probing can be used to read domain wall dielectric switching.Citation
Zhang, M., Chen, Z., Yue, Y., Chen, T., Yan, Z., Jiang, Q., ... Yan, H. (2021). Terahertz reading of ferroelectric domain wall dielectric switching. ACS Applied Materials & Interfaces, 13(10), 12622-12628. https://doi.org/10.1021/acsami.1c00523Publisher
American Chemical SocietyAdditional Links
https://pubs.acs.org/doi/full/10.1021/acsami.1c00523Type
ArticleDescription
“This document is the Accepted Manuscript version of a Published Work that appeared in final form in [ACS Applied Materials and Interfaces], copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/full/10.1021/acsami.1c00523ISSN
1944-8244EISSN
1944-8252ae974a485f413a2113503eed53cd6c53
10.1021/acsami.1c00523
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