Frequency-switchable polarity-inverted BAW resonators based on PZT/PTO epitaxial films using difference in coercive field

Takahiro Shimidzu, Takeshi Mori, Takahiko Yanagitani

研究成果: Article査読

7 被引用数 (Scopus)

抄録

Electrical frequency switching in bulk acoustic wave resonators based on lead zirconate titanate (PZT)/PbTiO3 epitaxial bilayer films is demonstrated and analyzed. In general, the coercive field of PbTiO3 is higher than that of PZT. Independent polarity inversion of the PZT layers is achieved by applying an intermediate electric field between the coercive fields of PZT and PbTiO3 to the bilayer films. The resonant frequency is switched between the fundamental mode resonance (0.56 GHz) and second mode resonance (1.58 GHz) by applying a negative or a positive electric field to the resonators. The second mode operation can be achieved in the absence of an external electric field. A theoretical model simulated by Mason's equivalent circuit model including the effect of the polarity-inverted structure agreed well with the experimental results. The electromechanical coupling coefficients kt2 of both the PZT layer and the PbTiO3 layer of the polarity-inverted bilayer were estimated to be 17.6% (kt = 0.42) by comparing the experimental results with the theoretical simulations.

本文言語English
論文番号212902
ジャーナルApplied Physics Letters
114
21
DOI
出版ステータスPublished - 2019 5月 27

ASJC Scopus subject areas

  • 物理学および天文学(その他)

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