Micromagnetic Study of Influence of Gd Content on Current-Induced Domain Wall Motion in a Ferrimagnetic Nanowire

摘要

In this study, the influence of Gd composition on current-induced domain wall motion in a Gd-Co ferrimagnetic nanowire was theoretically investigated with taking into account of composition dependence of magnetic properties. As a result, the intrinsic critical density to move domain wall significantly reduces near the compensation composition, which is achieved to be less than 10~5 A/cm~2. Moreover, the intrinsic critical current density also significantly reduces near a certain Gd composition where the domain wall energies of Bloch and Neel walls are almost the same.