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Spin-torque-driven ballistic precessional switching with 50 ps impulses

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3 Author(s)
Lee, O.J. ; Cornell University, Ithaca, New York 14853, USA ; Ralph, D.C. ; Buhrman, R.A.

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We demonstrate reliable spin-torque-driven ballistic precessional switching using 50 ps current impulses in a spin-valve device that includes both in-plane and out-of-plane spin polarizers. Different threshold currents as the function of switching direction and current polarity enable the final orientation of the magnetic free layer to be steered, in accord with a macrospin analysis, by the sign of the pulse, eliminating the need for read-before-write toggle operation. The pulse amplitude windows for this deterministic operation are wider and more symmetric as a function of current polarity for shorter impulses, while inhomogeneous fringe fields from the polarizers lead to asymmetries as a function of current direction.

Published in:

Applied Physics Letters  (Volume:99 ,  Issue: 10 )