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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Mechanical control of polar order.

Pushpendra Gupta1, Peter Meisenheimer2,3, Xinyan Li3,4

  • 1Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA.

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Mechanical pressure significantly reduces the voltage needed for polarization switching in bismuth ferrite (BiFeO3) multiferroics. This discovery enables lower energy control of ferroelectric polarization, advancing multiferroic device applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Bismuth ferrite (BiFeO3) is a model multiferroic material exhibiting coupled ferroelectric and ferroelastic properties.
  • Deterministic control of BiFeO3 domain structure is challenging due to high switching fields and competing polarization variants.

Purpose of the Study:

  • To identify and characterize a mechanically assisted polarization switching pathway in epitaxial BiFeO3 thin films.
  • To investigate the effect of concurrent mechanical pressure on the switching energetics and domain structure of BiFeO3.

Main Methods:

  • Utilized out-of-plane electric fields for polarization reversal in BiFeO3 thin films.
  • Applied mechanical pressure concurrently with electric fields to study its influence on switching.
  • Employed Piezoresponse Force Microscopy (PFM) to analyze domain structure and ferroelastic competition.

Main Results:

  • Electric-field-only switching required approximately 4 volts, stabilizing coexisting polarization states.
  • Concurrent mechanical pressure substantially reduced the coercive voltage, enabling spontaneous switching (down to 0 volts).
  • Mechanical pressure was shown to suppress ferroelastic domain competition, lowering the energy barrier for polarization rotation and domain wall motion.

Conclusions:

  • Mechanically assisted switching provides a pathway to fundamentally alter switching energetics in multiferroics.
  • Mechanical energy acts as an effective tool for probing and manipulating coupled ferroelastic-ferroelectric interactions.
  • This framework offers a general approach for controlling coupled order parameters in multiferroic oxides, with direct applications in device architectures requiring lower switching energy.