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We examine the effect a spatially non-uniform spin current with a componentpolarized partially out of the plane has on a low saturation magnetizationnanomagnet free layer. Micromagnetic simulations indicate that the spin torqueefficiency acting upon the reversing nanomagnet can be enhanced through thisprocess, resulting in faster switching with smaller currents. In doing so, wedetermine that micromagnetic structure within the nanomagnets can be beneficialfor reversal processes. We verify this enhancement experimentally in deviceswith a tapered nanopillar geometry that generates a spin current polarizedpartly out of plane. Finally, to take even better advantage of these effects,we examine micromagnetically the benefits of a tapered three-magnetic-layerstructure that further reduces reversal times while maintaining the thermalstability of the free layer.

Enhancement in spin-torque efficiency by nonuniform spin current generated within a tapered nanopillar spin valve