Current-Induced Domain Wall Motion in Perpendicular Magnetized Tb–Fe–Co Wire with Different Interface Structures

Abstract

Current-induced domain wall motion has been investigated in perpendicular magnetic anisotropy SiO2/TbFeCo/Pt (asymmetric interface) and Pt/TbFeCo/Pt (symmetric interface) wires. The domain wall is found to be moved in opposite to the electron-flow direction in the asymmetric interface wire whereas it is kept same direction in the symmetric one at room temperature. As an alternative to the conventional spin-transfer torque, the Rashba field at the TbFeCo/Pt interface and the spin Hall current injected from the Pt layer are possibilities of the reversed domain wall motion in an ultrathin magnetic film sandwiched by dissimilar materials.