Current-Induced Domain Wall Motion and Tilting in Perpendicularly Magnetized Racetracks.

ABSTRACT: The influence of C insertion on Dzyaloshinskii-Moriya interaction (DMI) as well as current-induced domain wall (DW) motion (CIDWM) and tilting in Pt/Co/Ta racetracks is investigated via a magneto-optical Kerr microscope. The similar DMI strength for Pt/Co/Ta and Pt/Co/C/Ta samples reveals that DMI mainly comes from the Pt/Co interface. Fast DW velocity around tens of m/s with current density around several MA/cm² is observed in Pt/Co/Ta. However, it needs double times larger current density to reach the same magnitude in Pt/Co/C/Ta, indicating DW velocity is related to the spin-orbit torque efficiency and pinning potential barrier. Moreover, in CIDWM, DW velocity is around 10³ times larger than that in field-induced DW motion (FIDWM) with current-generated effective f

SUBMITTER: Li D 

PROVIDER: S-EPMC6093834 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature