Time-resolved spin-torque switching and enhanced damping in permalloy/Cu/permalloy spin-valve nanopillars |
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Authors: | Emley N C Krivorotov I N Ozatay O Garcia A G F Sankey J C Ralph D C Buhrman R A |
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Institution: | Cornell University, Ithaca, New York 14853-2501, USA. |
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Abstract: | We report time-resolved measurements of current-induced reversal of a free magnetic layer in Permalloy/Cu/Permalloy elliptical nanopillars at temperatures T=4.2 K to 160 K. Comparison of the data to Landau-Lifshitz-Gilbert macrospin simulations of the free layer switching yields numerical values for the spin torque and the Gilbert damping parameters as functions of T. The damping is strongly T dependent, which we attribute to the presence of an antiferromagnetic oxide layer around the perimeter of the Permalloy free layer. This adventitious antiferromagnetic oxide can have a major impact on spin-torque phenomena. |
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