Journal Article

FZJ-2020-02145

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Tunable surface acoustic waves on strain-engineered relaxor K 0.7 Na 0.3 NbO 3 thin films

Liang, S. (Corresponding author)FZJ* ; Pfützenreuter, D. ; Finck, D. ; von Helden, L. ; Schwarzkopf, J. ; Wördenweber, R.FZJ*

2020
American Inst. of Physics Melville, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/25722  doi:10.1063/1.5140259

Abstract: In this work we demonstrate the electronic tunability of surface acoustic waves (SAWs) in epitaxially strained relaxor-type ferroelectric thin films. Epitaxial K0.7Na0.3NbO3 thin films of typically 30 nm in thickness are grown via pulsed laser deposition on (110)-oriented TbScO3. A partial plastic lattice relaxation of the epitaxial strain in these samples leads to a relaxor-type ferroelectricity of these films, which strongly affects the SAW properties. Without electronic bias only tiny SAW signals of ~0.2 dB can be detected at room temperature, which can be boosted up to 4 dB by a static voltage (DC) bias added to the high frequency (HF) driving current of the SAW transducers. Upon field cooling below the freezing temperature of polar nano regions (PNRs), this strong SAW signal can be preserved and is even enhanced due to a release of the electronically fixed PNRs if the bias is removed. In contrast, at elevated temperatures, a reversible switching of the SAW signal is possible. The switching shows relaxation dynamics that are typical for relaxor ferroelectrics. The relaxation time  decreases exponentially from several hours at freezing temperature to a few seconds (<5 s) at room temperature.

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Contributing Institute(s):

1. Bioelektronik (IBI-3)

Research Program(s):

1. 523 - Controlling Configuration-Based Phenomena (POF3-523) (POF3-523)

Appears in the scientific report 2020

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; PubMed Central ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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