Reduction in critical current of current induced switching in an inhomogeneous nanomagnet

Wu, M. C.; Aziz, A.; Ali, M.; Marrows, C. H.; Hickey, B. J.; Barber, Z. H.; Blamire, M. G.
March 2009
Applied Physics Letters;3/23/2009, Vol. 94 Issue 12, p122511
Academic Journal
We report low current-density switching of pseudospin valve nanopillars fabricated by a three-dimensional focused ion beam lithography. Simulations using the Landau–Liftshitz–Gilbert equation with Slonczewski spin transfer torque term demonstrate that magnetostatic coupling combined with an in-plane applied field results in a strongly inhomogeneous magnetization, which is close to the point of switching in both parallel and antiparallel configurations and so significantly reduced switching currents are possible.


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