Large-angle, gigahertz-rate random telegraph switching induced by spin-momentum transfer
Matthew Pufall, William Rippard, Shehzaad F. Kaka, Stephen E. Russek, Thomas J. Silva, Jordan A. Katine, Matt Carey
We show that a spin-polarized dc current passing through a small magnetic element induces two-state, random telegraph switching of the magnetization via the spin-momentum transfer effect. The resistances of the states differ by up to 50% of the change due to complete magnetization reversal. Fluctuations are seen for a wide range of currents and magnetic fields, with rates that can exceed 2 GHz, and involve collective motion of a large volume (10^4^ nm^3^) of spins. Switching rate trends with field and current indicate that increasing temperature alone cannot explain the dynamics. The rates approach a stochastic regime wherein dynamics are governed by both precessional motion and thermal perturbations.
Physical Review B (Condensed Matter and Materials Physics)
, Rippard, W.
, Kaka, S.
, Russek, S.
, Silva, T.
, Katine, J.
and Carey, M.
Large-angle, gigahertz-rate random telegraph switching induced by spin-momentum transfer, Physical Review B (Condensed Matter and Materials Physics), [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=31582
(Accessed December 8, 2023)