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A large remanent polarization close to theoretical value 80 C/cm2 of bulk PbTiO is achieved in epitaxialheterostructures of (120–600)-nm-thick PbTiOfilmsgrown by pulsed laser deposition on (001) SrTiO substrate using a 100-nm-thick SrRuO bottom electrode layer. The heterostructures employing a 50-nm-thick electrode exhibit a significantly smaller polarization of ≤60 C/cm2. A detailed x-ray diffraction analysis of the crystal structure allows for relating this large polarization to electrode-controlled relaxation of epitaxial strain in PbTiO. Based on the observed results, we anticipate that the electrode-promoted strain relaxation can be used to enhance polarization in other epitaxialferroelectricfilms.


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