Electric Field Induced Tunable and Metastable Remanent Strain and Remanent Permittivity in Ferroelectrics

Tech ID: 22251 / UC Case 2011-651-0

Summary

UCLA researchers in the Department of Mechanical and Aerospace Engineering have developed novel methods for ferroelectrics control that allows for metastable remanent strain and permittivity states. The remenant strains and permittivity changes are achieved with a simple pulsed electric field producing substantial and stable changes in the strains and permittivities.

Background

Current ferroelectric applications utilize linear ferroelectric properties from a polarized state so that when an electric field is applied, the piezoelectric strain and permittivity change linearly with the applied electric field. However, when the electric field is removed the strains and permittivity values return to their initial state. As a result, electrical power is required to maintain the new strain and permittivity states. This produces problems in many applications where long term changes are required or where power is a major issue.

Innovation

Researchers at UCLA have developed a novel method to control metastable remnant properties in ferroelectrics, specifically in (011) oriented relaxor ferroelectrics by applying a pulsed electric field in a specific regime resulting in permanent strain and permittivity changes (i.e. the strain and permittivity states remain after release of the electric field). Further, by applying pulsed electric fields of different amplitudes, the remenant properties can tuned within a wide range of values.

Applications

  • Antenna applications (e.g. phase shifters)
  • Magnetic random access memory (MRAM)
  • Future transduction applications
  • Novel spintronic applications
  • Ferromagnetic resonance based RF devices
  • Development of metastable reconfigurable RC resonator, filter and other varactor based microwave devices

Advantages

  • Permanent strain and permittivity
  • Tunable permittivity
  • Reduced power consumption

State Of Development

Researchers have characterized and shown the ferroelectric properties on 0.5 mm thick (011) PMN-PT single crystal substrate. Researchers have shown proof of concept using tunable remanent strain in MR-MRAM device.

Patent Status

Country Type Number Dated Case
United States Of America Issued Patent 9,166,147 10/20/2015 2011-651
 

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Inventors

  • Carman, Gregory P.

Other Information

Keywords

relaxor ferroelectrics, remanent strain, remanent permittivity, electrical field, magnetic random access memory (MRAM)

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