DataVXACS Applied Materials & InterfacesPaper
journal article·2021-03-17

Terahertz Reading of Ferroelectric Domain Wall Dielectric Switching

Man Zhang, Zhe Chen, Yajun Yue, Tao Chen, Zhongna Yan, Qinghui Jiang, Bin Yang, Mirva Eriksson, Jianhua Tang, Dou Zhang, Zhijian Shen, Isaac Abrahams, Haixue Yan

ACS Applied Materials & Interfaces· Volume 13· Issue 10
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Source abstract

Abstract

Ferroelectric 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.
Source: openalex_inverted_index · Quality: baseline

Research context

Ceramics & glassesNanomaterialsElectronic materials

OpenAlex topics: Ferroelectric and Piezoelectric Materials · Acoustic Wave Resonator Technologies · Microwave Dielectric Ceramics Synthesis

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom

Faculty of Science and Engineering, University of Chester, Thornton Science Park, Chester CH2 4NU, United Kingdom

College of Electronic Information Engineering, South-Central University for Nationalities, Minyuan Road, Wuhan 430074, China

School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom

State Key Laboratory of Powder Metallurgy, Central South University, South Lushan Road, Changsha 410083, China

School of Materials Science and Engineering, Huazhong University of Science and Technology, Luoyu Road, Wuhan 430074, China

Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden

Cancer Research UK Manchester Institute, The University of Manchester, Oxford Road, Manchester SK10 4TG, United Kingdom

Funding

Engineering and Physical Sciences Research Council · Royal Society · China Scholarship Council · National Natural Science Foundation of China · Guangzhou Guangding Technology Group Co. Ltd

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