Ruan, Hanchi;
Saunders, Theo Graves;
Giddens, Henry;
Zhang, Hangfeng;
Ihalage, Achintha Avin;
Kolb, Jonas Florentin;
Blunt, Matthew;
... Hao, Yang; + view all
(2023)
Microwave characterization of two Ba0.6Sr0.4TiO3 dielectric thin films with out-of-plane and in-plane electrode structures.
Journal of Advanced Ceramics
, 12
(8)
pp. 1521-1532.
10.26599/JAC.2023.9220769.
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Abstract
Ferroelectric (FE) thin films have recently attracted renewed interest in research due to their great potential for designing novel tunable electromagnetic devices such as large intelligent surfaces (LISs). However, the mechanism of how a polar structure in the FE thin films contributes to desired tunable performance, especially within the microwave frequency range, which is the most widely used frequency range of electromagnetics, has not been illustrated clearly. In this paper, we described several straightforward and cost-effective methods to fabricate and characterize Ba0.6 Sr0.4 TiO3 (BST) thin films at microwave frequencies. The prepared BST thin films here exhibit homogenous structures and great tunability (h) in a wide frequency and temperature range when the applied field is in the out-of-plane direction. The high tunability can be attributed to high concentration of polar nanoclusters. Their response to the applied direct current (DC) field was directly visualized using a novel non-destructive near-field scanning microwave microscopy (NSMM) technique. Our results have provided some intriguing insights into the application of the FE thin films for future programmable high-frequency devices and systems.
| Type: | Article |
|---|---|
| Title: | Microwave characterization of two Ba0.6Sr0.4TiO3 dielectric thin films with out-of-plane and in-plane electrode structures |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.26599/JAC.2023.9220769 |
| Publisher version: | https://doi.org/10.26599/JAC.2023.9220769 |
| Language: | English |
| Additional information: | Copyright © The Author(s) 2023. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
| Keywords: | Thin film, polarization, microwave, tunability, ferroelectric (FE) |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10176221 |
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