Strong and reciprocal magneto-phonon effects in a 2D antiferromagnetic semiconductor FePSe₃

Magnon-phonon coupling and spin-phonon interaction, both of which are interplays between phonons and magnetism, provide a new way to manipulate phonons. Two-dimensional (2D) magnetic systems are anisotropic in their magnetic order and may have magnons carrying spin angular momentum. According to recent reports, angular momentum can be transferred by the interaction of magnons and phonons. Here, focusing on two additional features in the Raman spectra at low frequencies that appear below the Néel temperature, we report that we can control the interplay between spin and lattice vibration and the energy of phonons coupled with magnons by changing the excitation laser power in the 2D antiferromagnetic FePSe₃ which shows magnon-phonon coupling in the absence of an external magnetic field. On the other hand, in high frequency of Raman spectra, another spin-phonon Raman scattering was observed for FePSe₃. Our results show that an out-of-plane magnetic field can control phonons and induce a Raman scattering rotation of the A_g mode. In this work, we provide a method of local heating to regulate the phonons coupled with magnons and reveal a spin-phonon phenomenon in antiferromagnetic materials.