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Microstructure and ferroelectric properties of ultrathin PbTiO3 films by MOCVD

  • Hironori Fujisawa (a1), Toru Horii (a2), Yoshiyuki Takashima (a3), Masaru Shimizu (a4), Yasutoshi Kotaka (a5) and Koichiro Honda (a6)...

Abstract

We report on microstructure and ferroelectric properties of ultrathin PbTiO3 films epitaxially grown on SrTiO3(100), La-doped SrTiO3(100) and SrRuO3/SrTiO3(100) by MOCVD. High angle annular dark field scanning transmission electron microscopy, atomic force microscopy, x-ray diffraction and x-ray reflectivity measurements demonstrated that 1-20 monolayer (ML)-thick epitaxial PbTiO3 films had high-crystallinity, atomically flat surface and sharp interface at an atomic scale. The epitaxial relationship and thickness were also confirmed by these methods. Kelvin force probe microscopy and contact resonance piezoresponse force microscopy revealed that a 7ML (2.7nm)-thick PbTiO3 film grown on SrRuO3/SrTiO3 had the ferroelectric polarization.

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Microstructure and ferroelectric properties of ultrathin PbTiO3 films by MOCVD

  • Hironori Fujisawa (a1), Toru Horii (a2), Yoshiyuki Takashima (a3), Masaru Shimizu (a4), Yasutoshi Kotaka (a5) and Koichiro Honda (a6)...

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