Novel interpretation of recent experiments on the dynamics of domain walls along ferrimagnetic strips
arXiv:2011.09736 · doi:10.1088/1361-648X/aba7eb
Abstract
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.
13 pages, 5 figures
References in corpus (3)
- Coherent Terahertz Spin-Wave Emission Associated with Ferrimagnetic Domain Wall Dynamics
- Current-driven domain wall dynamics in ferrimagnets: micromagnetic approach and collective coordinates model
- Current-driven domain wall dynamics in ferromagnetic layers synthetically exchange-coupled by a spacer: A micromagnetic study