Nanosize confinement induced enhancement of spontaneous polarization in a ferroelectric nanowire

Details Nanosize confinement induced enhancement of spontaneous polarization in a ferroelectric nanowire Nanosize confinement induced enhancement of spontaneous polarization in a ferroelectric nanowire

2010-05-17

arxiv.org/abs/1005.2920v1

published as Appl. Phys. Lett. 95, 232901 (2009)

Physics

Condensed Matter

Materials Science

14 pages, 4 figures

Scientific paper

10.1063/1.3271175

We theoretically showed that the spontaneous polarization in ferroelectric (FE) nanowires (NWs) can be considerably enhanced due to the nanosize confinement by the first-principles calculations. The spontaneous polarization along the wire direction in a fully-relaxed PbTiO3 NW with 1.8 nm diameter is 1.26 times higher than that of bulk counterpart. The tension induced by NW surface curvature counteracts the near-surface depolarizing effect and meanwhile leads to the unusual enhancement of spontaneous polarization. These findings indicated that FE NWs can be promising in the applications of nanodevices.

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