Extended s–d models for the dynamics of noncollinear magnetization: Short review of two different approaches

In the literature there are two s–d models (by De Angeli et al. and by Zhang and Zhang) on the dynamics of noncollinear magnetization which treat the spin current density in completely different ways. It is shown that both models yield similar results for the spatial dependence of the damping term in such systems. The interrelations between the two models are discussed extensively. - Highlights: ► A short review is given on the extended s–d models of noncollinear magnetization dynamics. ► It is shown that the two models which have completely different approaches are interrelated. ► The two models yield similar results for the spatial dependence of the damping term in the equation of motion.