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Related Experiment Videos

Intrinsic ferroelectric coercive field

Ducharme1, Fridkin, Bune

  • 1Department of Physics and Astronomy, Center for Materials Research and Analysis, University of Nebraska, Lincoln, Nebraska 68588-0111, USA.

Physical Review Letters
|October 4, 2000
PubMed
Summary

Researchers achieved the intrinsic coercive field in ultrathin polymer films, matching theoretical predictions for ferroelectric polarization reversal. This breakthrough overcomes limitations of static theories by minimizing nucleation and dynamic effects.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Ferroelectricity

Background:

  • Landau-Ginzburg theory predicts intrinsic coercive fields for ferroelectric polarization reversal.
  • Observed coercive fields are typically smaller due to nucleation and dynamic effects not accounted for in static theories.

Purpose of the Study:

  • To experimentally realize and measure the intrinsic coercive field in ferroelectric materials.
  • To investigate the influence of film thickness and temperature on the coercive field.

Main Methods:

  • Fabrication of two-dimensional Langmuir-Blodgett polymer films with thicknesses down to 1 nm.
  • Measurement of the coercive field in these ultrathin films.

Main Results:

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  • The intrinsic coercive field was successfully realized for the first time in 1 nm thin polymer films.
  • Measured coercive fields closely matched theoretical intrinsic values predicted by Landau-Ginzburg theory.
  • The coercive field exhibited the expected temperature dependence and was independent of thickness below 15 nm.

    • Conclusions:

    • Ultrathin ferroelectric polymer films can exhibit intrinsic polarization reversal behavior.
    • Experimental realization of the intrinsic coercive field validates theoretical predictions and opens new avenues for ferroelectric device design.