Spectra of Elementary Excitations in Bulk Iron

We present a comprehensive review on the major role played by quasiparticles in the advancement of solid state physics with a focus on the elastic and magnetic excitations. The concept of phonons and magnons as quasiparticles is discussed and their relevant parameters including energy spectra are highlighted. The state-of-the-art in molecular and spin dynamics simulations of phonon and magnon spectra in bulk α-Fe by methods, such as the dynamic matrix and dynamic structure factor approach with the aid of different interatomic potentials, is thoroughly analyzed showing their advantages and inconveniences when used to compute the dispersion curves of phonons and magnons and their mutual interaction. This mini review constitutes a pertinent step toward the comprehension of coupled lattice vibrations and magnetic excitations dynamics, and it may stimulate novel research activities in spin transport phenomena.