Magnetization dynamics in the density matrix formalism
Abstract
Magnetization dynamics have been studied extensively and measured in experiments. The LLGS equation that dominates magnetization dynamics is also described by the generic equations of twolevel quantum systems. Yet, the analogy between magnetization and twolevel dynamics is still elusive to date. In this paper, we present a rigorous mathematical derivation of magnetization dynamics using twolevel density matrix formalism. Specifically, we describe each term in the density matrix dynamical equations with terms from LLGS equation. The magnetization dynamics equivalent of the optical pump will be found to resemble the right \ left polarized field as in the alloptical switching experiment. The damping terms, that are introduced phenomenologically in optics, will be explained using physical magnetization phenomena, such as the STT oscillator.
 Publication:

arXiv eprints
 Pub Date:
 October 2021
 arXiv:
 arXiv:2110.06138
 Bibcode:
 2021arXiv211006138A
 Keywords:

 Condensed Matter  Strongly Correlated Electrons
 EPrint:
 11 pages, 2 figures. 1 table