Large-angle, gigahertz-rate random telegraph switching induced by spin-momentum transfer
Materials Science
2009-11-10 v1
Abstract
We show that 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.
Keywords
Cite
@article{arxiv.cond-mat/0404109,
title = {Large-angle, gigahertz-rate random telegraph switching induced by spin-momentum transfer},
author = {Matthew R. Pufall and William H. Rippard and Shehzaad Kaka and Steven E. Russek and Thomas J. Silva and Jordan Katine and Matt Carey},
journal= {arXiv preprint arXiv:cond-mat/0404109},
year = {2009}
}
Comments
14 pages (with captions), 4 Figures