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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Switchable Magnonic Crystals Based on Spin Crossover/CrSBr Heterostructures.

Andrei Shumilin1, Sourav Dey1,2, Denisa Coltuneac3

  • 1Instituto de Ciencia Molecular, Universitat de València, Paterna, Spain.

Advanced Materials (Deerfield Beach, Fla.)
|May 14, 2026
PubMed
Summary

Chemically engineered hybrid materials enable tunable magnonic crystals. Integrating switchable spin-crossover molecules with 2D magnets allows light-controlled manipulation of spin waves for programmable devices.

Keywords:
first‐principlesmagnonic crystalsmagnonsspin‐crossover compoundsstraintronics

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Magnonics relies on materials for controlled spin wave propagation.
  • Spin-crossover (SCO) molecules offer switchable properties.
  • 2D van der Waals magnets provide a platform for novel electronic devices.

Purpose of the Study:

  • To develop a chemical approach for creating locally tunable magnonic crystals.
  • To investigate the integration of SCO molecules with 2D van der Waals magnets.
  • To demonstrate light-controlled reconfigurability of magnonic properties.

Main Methods:

  • First-principles calculations of hybrid molecular/2D heterostructures.
  • Investigating the stability and SCO bistability of Fe-pz molecules on CrSBr.
  • Simulating patterned Fe-pz stripes on CrSBr to form magnonic crystals.
  • Analyzing the effect of light-driven excited spin-state trapping (LIESST) on strain and band structure.

Main Results:

  • Fe-pz molecules are stable on CrSBr, preserving SCO bistability.
  • Patterned Fe-pz/CrSBr interfaces act as frequency-filtering magnonic crystals.
  • LIESST induces local strain, dynamically reshaping the magnonic band structure.
  • Achieved up to ~1.3% local strain via LIESST.

Conclusions:

  • Fe-pz@CrSBr is a promising platform for on-chip, programmable magnonic devices.
  • This work demonstrates a chemical design strategy for artificial, light-controlled reconfigurable magnonic crystals.
  • Opens new avenues for designing advanced magnonic functionalities through molecular integration.