Terahertz Reading of Ferroelectric Domain Wall Dielectric Switching,ACS Applied Materials & Interfaces

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Terahertz Reading of Ferroelectric Domain Wall Dielectric Switching
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-03-08 , DOI: 10.1021/acsami.1c00523
Man Zhang ₁ , Zhe Chen _{2,

3} , Yajun Yue ₄ , Tao Chen ₄ , Zhongna Yan _{4,

5} , Qinghui Jiang ₆ , Bin Yang ₂ , Mirva Eriksson ₇ , Jianhua Tang ₈ , Dou Zhang ₅ , Zhijian Shen ₇ , Isaac Abrahams ₄ , Haixue Yan ₁

Affiliation

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, Ca_0.99Rb_0.005Ce_0.005Bi₂Nb₂O₉, 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.

中文翻译：

铁电畴壁介质开关的太赫兹读取

铁电畴壁（DWs）是两个畴之间重要的纳米级界面。铁电畴壁在太赫兹（THz）频率下空转工作已被广泛接受，因此不鼓励对畴壁进行工程设计，以创建利用THz辐射的新应用。但是，本工作清楚地证明了无铅Aurivillius相铁电陶瓷Ca _0.99 Rb _0.005 Ce _0.005 Bi ₂ Nb ₂ O ₉在THz频率下畴壁的活性。，使用太赫兹时域光谱（THz-TDS）进行了检查。畴壁的动态在kHz和THz频率下是不同的。在低频下，畴壁作为一组工作以增加介电常数。在太赫兹频率下，畴壁的缺陷性质会降低整体介电常数。极化后THz频段的介电常数较高证明了这一点，这反映了畴壁密度的降低。弹性振动模型也已用于验证畴壁中的单个受阻偶极子对介电常数的贡献比其在畴中的对应物弱。这项工作代表了在理解THz频率下畴壁介电贡献方面的根本突破。

更新日期：2021-03-17

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