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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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Electrically Switchable Persistent Spin Texture in a Two-Dimensional Hybrid Perovskite Ferroelectric.

Wuqian Guo1,2, Haojie Xu1,2, Yu Ma1,2

  • 1State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.

Angewandte Chemie (International Ed. in English)
|February 22, 2023
PubMed
Summary

Researchers developed electrically switchable persistent spin texture (PST) in a novel 2D perovskite ferroelectric material, (PA)₂CsPb₂Br₇. This breakthrough enables electrical control over spin texture, advancing spintronic applications.

Keywords:
Electric SwitchesFerroelectricsPerovskitesPersistent Spin Texture

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Spintronics

Background:

  • Persistent spin texture (PST) offers advantages for spin lifetime due to its momentum-independent nature, resisting spin relaxation.
  • Manipulating PST is challenging due to limited material choices and unclear structure-property relationships.

Purpose of the Study:

  • To introduce a new 2D perovskite ferroelectric material, (PA)₂CsPb₂Br₇, for electrically switchable persistent spin texture (PST).
  • To investigate the mechanism of electrical switching of PST in this material.

Main Methods:

  • Synthesis and characterization of the 2D perovskite ferroelectric (PA)₂CsPb₂Br₇.
  • Theoretical modeling of bulk and monolayer structures to understand intrinsic PST.
  • Investigating the relationship between ferroelectric polarization and spin texture direction.

Main Results:

  • (PA)₂CsPb₂Br₇ exhibits a high Curie temperature (349 K), significant spontaneous polarization (3.2 μC/cm²), and low coercive field (5.3 kV/cm).
  • Intrinsic PST was observed in both bulk and monolayer models, facilitated by ferroelectric symmetry-breaking and spin-orbit coupling.
  • The direction of PST was successfully reversed by electrically switching the spontaneous polarization, linked to PbBr₆ octahedra tilting and PA⁺ cation reorientation.

Conclusions:

  • Electrically switchable PST was demonstrated in the 2D hybrid perovskite (PA)₂CsPb₂Br₇.
  • This material provides a promising platform for electrical control and manipulation of spin textures in spintronic devices.