Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-11-15
Physics
Condensed Matter
Other Condensed Matter
22 pages, 5 figures, submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.77.144423
We examine the effect a spatially non-uniform spin current with a component polarized partially out of the plane has on a low saturation magnetization nanomagnet free layer. Micromagnetic simulations indicate that the spin torque efficiency acting upon the reversing nanomagnet can be enhanced through this process, resulting in faster switching with smaller currents. In doing so, we determine that micromagnetic structure within the nanomagnets can be beneficial for reversal processes. We verify this enhancement experimentally in devices with a tapered nanopillar geometry that generates a spin current polarized partly out of plane. Finally, to take even better advantage of these effects, we examine micromagnetically the benefits of a tapered three-magnetic-layer structure that further reduces reversal times while maintaining the thermal stability of the free layer.
Braganca P. M.
Buhrman Robert A.
Garcia A. G. F.
Lee Oliver Justin
Ozatay Ozhan
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