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@ARTICLE{Liang:877329,
      author       = {Liang, Sijia and Pfützenreuter, D. and Finck, Dennis and
                      von Helden, L. and Schwarzkopf, J. and Wördenweber, R.},
      title        = {{T}unable surface acoustic waves on strain-engineered
                      relaxor {K} 0.7 {N}a 0.3 {N}b{O} 3 thin films},
      journal      = {Applied physics letters},
      volume       = {116},
      number       = {5},
      issn         = {1077-3118},
      address      = {Melville, NY},
      publisher    = {American Inst. of Physics},
      reportid     = {FZJ-2020-02145},
      pages        = {052902 -},
      year         = {2020},
      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.},
      cin          = {IBI-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IBI-3-20200312},
      pnm          = {523 - Controlling Configuration-Based Phenomena (POF3-523)},
      pid          = {G:(DE-HGF)POF3-523},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000513133500013},
      doi          = {10.1063/1.5140259},
      url          = {https://juser.fz-juelich.de/record/877329},
}