Figure 3. Depinning threshold current as a function of magnetic field.
(a,b) Numerical calculation of the depinning threshold current density Jth as a function of ΔH for Hk > 2Hc (a) and Hk < 2Hc (b). Different combinations of spin torques are considered. The red and black circles show respectively the evolution of Jth when the depinning process is governed only by the Slonczewski torque and only by the Field-like torque, with a ratio FLT/ST ζ = 0.3. The gray crosses show the case where both torques are considered together, still with ζ = 0.3. (c) Experimental measurements of Jth for two different stripe widths W = 90 nm (blue squares) and W = 110 nm (green squares) compared with numerical calculations for HK = 2Hc = 30 Oe.