Publication Type:Journal Article
Source:Science, Volume 324, Number 5933, p.1421-1425 (2009)
Keywords:Article, atomic force microscopy, controlled study, dielectric property, electric current, electric field, Electron transport, ferric oxide, hysteresis, lead, oxide, Polarization, priority journal, reproducibility, surface charge, thin filament, titanate, titanium, zirconium
We demonstrate a highly reproducible control of local electron transport through a ferroelectric oxide via its spontaneous polarization. Electrons are injected from the tip of an atomic force microscope into a thin film of lead-zirconate titanate, Pb(Zr0.2Ti0.8)O3, in the regime of electron tunneling assisted by a high electric field (Fowler-Nordheim tunneling). The tunneling current exhibits a pronounced hysteresis with abrupt switching events that coincide, within experimental resolution, with the local switching of ferroelectric polarization. The large spontaneous polarization of the PZT film results in up to 500-fold amplification of the tunneling current upon ferroelectric switching. The magnitude of the effect is subject to electrostatic control via ferroelectric switching, suggesting possible applications in ultrahigh-density data storage and spintronics.
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