Enhanced perpendicular spin transfer torque in magnetic multilayers with a capping layer

Abstract

In this paper, we model the effects of the physical properties of the capping layer, such as spin diffusion length (lsf cap), resistivity (ρcap), and interfacial conductance (G↑cap, G↓cap) on the spin transport across a pseudo-spin-valve (PSV) structure. In particular, we investigate how the properties of the capping layer can be modified in order to enhance the perpendicular component (τ⊥) of the spin transfer torque vis-a-vis the inplane (τ¶) component. The results suggest that the capping layer can serve as an effective medium for tuning the ratio of τ⊥ to τ¶ by varying its physical properties. © 2006 IEEE.