[EN] Theoretical studies dealing with current-driven domain wall dynamics in ferrimagnetic
alloys and, by extension, other antiferromagnetically coupled systems
as some multilayers, are here presented. The analysis has been made by means
of micromagnetic simulations that consider these systems as constituted by two
subsystems coupled in terms of an additional exchange interlacing them. Both
subsystems differ in their respective gyromagnetic ratios and temperature dependence.
Other interactions, as for example anisotropic exchange or spin-orbit
torques, can be accounted for differently within each subsystem according to the
physical structure. Micromagnetic simulations are also endorsed by means of a
collective coordinates model which, in contrast with some previous approaches
to these antiferromagnetically coupled systems, based on effective parameters,
also considers them as formed by two coupled subsystems with experimentally
definite parameters. Both simulations and the collective model reinforce the
angular moment compensation argument as accountable for the linear increase
with current of domain wall velocities in these alloys at a certain temperature
or composition. Importantly, the proposed approach by means of two coupled
subsystems permits to infer relevant results in the development of future experimental
setups that are unattainable by means of effective models.MAT2017-87072-C4-1-P from the Spanish government
SA299P18 from the Junta de Castillay León