講演情報
[7a-N302-2]Engineering THz Magnon Frequencies via Stacking in 2D Ferromagnetic van der Waals CrI3/As Bilayer: a First-Principles Study
〇(D)Andi Gumarilang Ahmadi1, Kohji Nakamura1 (1.Mie Univ.)
キーワード：
Magnonics、2D van der Waals materials、THz Ferromagnetic Resonance Frequencies
Discovery of 2D ferromagnetic van der Waals CrI3 opens new avenues for tunable THz magnon excitation by harnessing the possibility of multiple stacking orders in one multi-layer system. In this presentation, we demonstrated the THz magnon frequencies modulation in multiple CrI3/As stacking orders by employing first-principles calculation and linear spin-wave theory. In each stacking order, interaction between I and As atoms leads to a significant enhancement of the spin-exchange constants Kitaev interactions. In the magnon dispersion, the degeneracy between optic and acoustic modes can be lifted by the enhanced Kitaev interaction, inversion symmetry breaking, and C3z rotational symmetry breaking. The enhancement of optic mode FMR frequencies ranges from 14% to 60% from 5.14 THz, which depends on the spin-exchange constants enhancement, while the modulation of acoustic mode FMR frequencies ranges from weakening of 15% to enhancement of 100%, from 0.12 THz which depends on the magnetic anisotropy energy modulation driven by the Kitaev interactions.