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Spin-Phonon Coupling in Ferromagnetic Monolayer Chromium Tribromide.

Jiang-Bin WuYu YaoMiao-Ling LinMalte RösnerZhonghao DuKenji WatanabeTakashi TaniguchiPing-Heng TanStephan HaasHan Wang
Published in: Advanced materials (Deerfield Beach, Fla.) (2022)
Novel 2D magnets exhibit intrinsic electrically tunable magnetism down to the monolayer limit, which has significant value for nonvolatile memory and emerging computing device applications. In these compounds, spin-phonon coupling (SPC) typically plays a crucial role in magnetic fluctuations, magnon dissipation, and ultimately establishing long-range ferromagnetic order. However, a systematic understanding of SPC in 2D magnets that combines theory and experiment is still lacking. In this work, monolayer chromium tribromide is studied to investigate SPC in 2D magnets via Raman spectroscopy and first principle calculations. The experimental Curie temperature and phonon shifts are found to be in good agreement with the numerical simulations. Specifically, it is demonstrated how magnetic exchange interactions affect phonon vibrations, which helps establish design fundamentals for 2D magnetic materials and other related devices.
Keyphrases
  • room temperature
  • raman spectroscopy
  • molecularly imprinted
  • density functional theory
  • ionic liquid
  • molecular dynamics
  • working memory
  • monte carlo
  • single molecule
  • mass spectrometry