We developed a film stack structure of Co/Ni with perpendicular magnetic anisotropy (PMA), which is suitable for current-induced domain wall (DW) motion. A Ta/Pt underlayer effectively provided a sufficiently large PMA to achieve the DW motion driven by a small current. The critical current density ( j c) had a minimum value at a Pt underlayer thickness (tUL) of 2.4nm and was insensitive to cap layer thickness (tcap). The dependence of jc on tUL and tcap can be accounted for in terms of the effective spin polarization.
ASJC Scopus subject areas
- Physics and Astronomy(all)