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Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
11:17

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Published on: February 9, 2017

Multiferroic domain dynamics in strained strontium titanate.

A Vasudevarao1, A Kumar, L Tian

  • 1Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.

Physical Review Letters
|February 7, 2007
PubMed
Summary

Applying biaxial strain induces multiferroicity in strontium titanate thin films. Researchers observed phase transitions and revealed coupled ferroelectric-ferroelastic domain wall motion, relevant to multiferroic materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Ferroelectricity

Background:

  • Multiferroicity, the coexistence of ferroelectric and magnetic orders, is a key area in condensed matter physics.
  • Strontium titanate (SrTiO3) is a well-studied perovskite oxide with potential for multiferroic applications.
  • Inducing and controlling ferroelectric and ferroelastic properties via external stimuli like strain is crucial for device applications.

Purpose of the Study:

  • To investigate the induction of multiferroicity in strontium titanate thin films using biaxial strain.
  • To characterize the phase transitions and domain dynamics under strain.
  • To elucidate the mechanism of coupled ferroelectric-ferroelastic domain wall motion.

Main Methods:

  • Optical second harmonic generation (SHG) for phase transition detection.
  • Piezoelectric force microscopy (PFM) for studying ferroelectric domain switching.
  • Phase-field modeling to understand domain wall motion mechanisms.

Main Results:

  • Observed a transition from the 4/mmm phase to a ferroelectric mm2 phase in strained strontium titanate.
  • Reported a subsequent transition to a ferroelastic-ferroelectric mm2 phase.
  • Revealed the mechanism of coupled ferroelectric-ferroelastic domain wall motion using SHG and phase-field modeling.

Conclusions:

  • Biaxial strain effectively induces multiferroicity in strontium titanate thin films.
  • Coupled ferroelectric and ferroelastic domain wall motion is a key phenomenon in these strained materials.
  • The findings are relevant for developing novel multiferroic materials with coupled polar and axial properties.