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

Hyungwoo Lee | Zendy; Tae Heon Kim | Zendy; J. J. Patzner | Zendy; Haidong Lu | Zendy; Jung Woo Lee | Zendy; Hua Zhou | Zendy; W. Chang | Zendy; Mahesh K. Mahanthappa | Zendy; Evgeny Y. Tsymbal | Zendy; Alexei Gruverman | Zendy; ChangBeom Eom | Zendy

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

Author(s) -

Hyungwoo Lee,

Tae Heon Kim,

J. J. Patzner,

Haidong Lu,

Jung Woo Lee,

Hua Zhou,

W. Chang,

Mahesh K. Mahanthappa,

Evgeny Y. Tsymbal,

Alexei Gruverman,

ChangBeom Eom

Publication year - 2016

Publication title -

nano letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 4.853

H-Index - 488

eISSN - 1530-6992

pISSN - 1530-6984

DOI - 10.1021/acs.nanolett.5b05188

Subject(s) - ferroelectricity , materials science , polarization (electrochemistry) , thin film , bistability , piezoresponse force microscopy , scattering , nanotechnology , optoelectronics , optics , dielectric , chemistry , physics

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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