Imprint Control of BaTiO3 Thin Films via Chemically Induced Surface Polarization Pinning

Nano Letters
Hyungwoo LeeC B Eom

Abstract

Surface-adsorbed polar molecules can significantly alter the ferroelectric properties of oxide thin films. Thus, fundamental understanding and controlling the effect of surface adsorbates are crucial for the implementation of ferroelectric thin film devices, such as ferroelectric tunnel junctions. Herein, we report an imprint control of BaTiO3 (BTO) thin films by chemically induced surface polarization pinning in the top few atomic layers of the water-exposed BTO films. Our studies based on synchrotron X-ray scattering and coherent Bragg rod analysis demonstrate that the chemically induced surface polarization is not switchable but reduces the polarization imprint and improves the bistability of ferroelectric phase in BTO tunnel junctions. We conclude that the chemical treatment of ferroelectric thin films with polar molecules may serve as a simple yet powerful strategy to enhance functional properties of ferroelectric tunnel junctions for their practical applications.

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Citations

May 28, 2016·Nano Letters·Yu Jin KimCheol Seong Hwang
Sep 20, 2018·Nature Communications·Yu TianJinxing Zhang
Jan 17, 2020·The Journal of Chemical Physics·Nathalie Vonrüti, Ulrich Aschauer
Sep 26, 2019·Nanoscale·Neus DomingoPatrycja Paruch
Jun 6, 2017·ACS Applied Materials & Interfaces·Ryota Takahashi, Mikk Lippmaa
Aug 16, 2017·ACS Applied Materials & Interfaces·Jinyan ZhaoZuo-Guang Ye
Jun 19, 2018·ACS Applied Materials & Interfaces·Fanmao LiuJosep Fontcuberta
May 13, 2020·ACS Applied Materials & Interfaces·Ryota Takahashi, Mikk Lippmaa

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