NIST logo

Publication Citation: Large-angle, gigahertz-rate random telegraph switching induced by spin-momentum transfer

NIST Authors in Bold

Author(s): Matthew R. Pufall; William H. Rippard; Shehzaad F. Kaka; Stephen E. Russek; Thomas J. Silva; Jordan A. Katine; Matt Carey;
Title: Large-angle, gigahertz-rate random telegraph switching induced by spin-momentum transfer
Published: July 27, 2004
Abstract: 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.
Citation: Physical Review B (Condensed Matter and Materials Physics)
Volume: 69
Pages: pp. 214409-1 - 214409-5
Keywords: 1/f noise;spin-momentum transfer;spin-valve;telegraph noise
Research Areas: Electromagnetics
PDF version: PDF Document Click here to retrieve PDF version of paper (521KB)