Domain wall motion along ferrimagnets is evaluated using micromagnetic
simulations and a collective-coordinates model, both considering two sublattices with
independent parameters. Analytical expressions are derived for strips on top of
either a heavy metal or a substrate with negligible interfacial Dzyaloshinskii-Moriya
Interaction. The work focuses its findings in this latter case, with a field-driven
domain wall motion depicting precessional dynamics which become rigid at the angular
momentum compensation temperature, and a current-driven dynamics presenting
more complex behavior, depending on the polarization factors for each sublattice.
Importantly, our analyses provide also novel interpretation of recent evidence on
current-driven domain wall motion, where walls move either along or against the
current depending on temperature. Besides, our approach is able to substantiate the
large non-adiabatic effective parameters found for these systems.
