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Updated: Jun 9, 2025

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Flexomagnetoelectric Effect in Sr_{2}IrO_{4} Thin Films.

Xin Liu1,2,3, Ting Hu4, Yujun Zhang5

  • 1School of Physics and Astronomy, <a href="https://ror.org/022k4wk35">Beijing Normal University</a>, Beijing 100875, China.

Physical Review Letters
|October 25, 2024
PubMed
Summary
This summary is machine-generated.

Strain gradients in Sr_{2}IrO_{4} thin films break space-inversion symmetry, creating emergent polar phases and magnetic moments. This enables control of polarization via magnetic fields, demonstrating a flexomagnetoelectric effect.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • Symmetry engineering is crucial for manipulating phases in strongly correlated materials.
  • Flexural stress can break space-inversion or time-reversal symmetry.
  • Sr_{2}IrO_{4} is a centrosymmetric antiferromagnet with potential for symmetry manipulation.

Purpose of the Study:

  • To investigate the effects of strain gradient on the symmetry and properties of Sr_{2}IrO_{4}.
  • To explore the creation of emergent polar phases and magnetic ordering.
  • To demonstrate a flexomagnetoelectric effect in Sr_{2}IrO_{4} thin films.

Main Methods:

  • Introducing strain gradients in Sr_{2}IrO_{4} thin films.
  • Experimental observation of emergent polar phase and out-of-plane magnetic moment.
  • Application of magnetic fields to control polarization via spin-orbit interaction.

Main Results:

  • Space-inversion symmetry was broken in Sr_{2}IrO_{4} thin films due to strain gradient.
  • An emergent polar phase and out-of-plane magnetic moment were simultaneously observed.
  • A flexomagnetoelectric effect was demonstrated, with polarization controlled by magnetic fields.

Conclusions:

  • Strain gradient is an effective method to break symmetry and induce ferroic order in correlated materials.
  • Artificial design of multiple symmetries and ferroic orderings is achievable in Sr_{2}IrO_{4}.
  • This work provides a general strategy for designing complex phases in strongly correlated systems.