Nanoscale polarization manipulation and conductance switching in ultrathin films of a ferroelectric copolymer | Zendy

Hongwei Qu | Zendy; Wei Yao | Zendy; Tomás García | Zendy; Jiandi Zhang | Zendy; A. V. Sorokin | Zendy; Stephen Ducharme | Zendy; P. A. Dowben | Zendy; V. M. Fridkin | Zendy

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Nanoscale polarization manipulation and conductance switching in ultrathin films of a ferroelectric copolymer

Author(s) -

Hongwei Qu,

Wei Yao,

Tomás García,

Jiandi Zhang,

A. V. Sorokin,

Stephen Ducharme,

P. A. Dowben,

V. M. Fridkin

Publication year - 2003

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.1582366

Subject(s) - ferroelectricity , materials science , nanoscopic scale , copolymer , polarization (electrochemistry) , condensed matter physics , conductance , ferroelectric polymers , quantum tunnelling , scanning tunneling microscope , nanotechnology , polymer , optoelectronics , chemistry , dielectric , physics , composite material

We report the direct observation of induced molecular reorientation on a ferroelectric copolymer with a scanning tunneling microscope (STM). Ultrathin copolymer films of vinylidene fluoride (70%) with trifluoroethylene (30%) revealed a quasihexagonal close-packing structure with long-range polymer chain ordering. By flipping the polarity of the STM tip bias voltage, a reversal of local polarization was observed through an apparent lattice shift and was accompanied by an asymmetric “diode-like” character in tunneling current I(V). These results clearly demonstrated conductance switching behavior on nanoscale with local polarization reversal.

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