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We study the relationship between the damping (a) and the nonadiabaticity of the spin transport (fJ) in permaUoy nanowires, a is engineered by Ho doping, and from the characteristics of the current-induced domain-wall velocity, determined by high-resolution x-ray magnetic circular-dichroism photoemission electron microscopy, f3 due to spin relaxation is measured. We find that f3 scales with a and conclude that the spin relaxation that leads to nonadiabatic spin torque originates from the same underlying mechanism as the angular momentum dissipation that causes viscous damping, Magnetic domain-wall (DW) propagation by spin polarized current l has attracted increasing attention in the last few years due to fundamental interest in the interaction between current and magnetization?,3 and the possibility of applications in spintronics. 4 However, despite a number of experimental5- 1l and theoretical investigations, 12-14 the mechanism of current-induced DW motion in magnetic nanowires is not fully understood. In a phenomenological approach, two spin-torque terms were added to the Landau Lifshitz and Gilbert equation of magnetization dynamics to describe the influence of a current 12 ,13

Scaling of spin relaxation and angular momentum dissipation in permalloy nanowires