Terahertz reading of ferroelectric domain wall dielectric switching
Yue, Y. J.
Yan, Z. N.
Jiang, Q. H.
Shen, Z. J.
Yan, H. X.
AffiliationSchool of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom.
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AbstractFerroelectric domain walls (DWs) are important nanoscale 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 utilize 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 the dielectric contributions of domain walls at THz frequencies. It also demonstrates that THz probing can be used to read domain wall dielectric switching.
CitationZhang M, Chen Z, Yue Y, Chen T, Yan Z, Jiang Q, et al. Terahertz Reading of Ferroelectric Domain Wall Dielectric Switching. ACS Appl Mater Interfaces. 2021 Mar 9;13(10):12622–8.
JournalACS Applied Materials & Interfaces
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