Abstract
Using an atomistic model that simultaneously treats the dynamics of translational and spin degrees of freedom,
we perform combined molecular and spin dynamics simulations to investigate the mutual influence of the phonons
and magnons on their respective frequency spectra and lifetimes in ferromagnetic bcc iron. By calculating the
Fourier transforms of the space- and time-displaced correlation functions, the characteristic frequencies and the
linewidths of the vibrational and magnetic excitation modes were determined. Comparison of the results with that
of the stand-alone molecular dynamics and spin dynamics simulations reveals that the dynamic interplay between
the phonons and magnons leads to a shift in the respective frequency spectra and a decrease in the lifetimes.
Moreover, in the presence of lattice vibrations, additional longitudinal magnetic excitations were observed with
the same frequencies as the longitudinal phonons.
