Suppression of noise in magnetic layers by a periodic spin torque

A. Rebei
Phys. Rev. E 83, 061148 – Published 27 June 2011

Abstract

The simultaneous effect of thermal noise and time-periodic spin torques on magnetic multilayers are treated in this work. Using two commonly studied magnetic systems with multiple stable states at zero temperature as examples, we show that periodic spin torques can enhance the stability of the system and suppress the noise due to interwell transitions. In the case of weak periodic spin torques, stochastic resonance, which is usually associated with ac magnetic fields, is also manifested for nonconservative torques. In more complex systems with a relatively low energy barrier, it is shown that high-frequency spin torques can inhibit interwell transitions and in effect suppress the telegraph noise due to the switching between neighboring states.

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  • Received 22 December 2010

DOI:https://doi.org/10.1103/PhysRevE.83.061148

© 2011 American Physical Society

Authors & Affiliations

A. Rebei*

  • KAIN, King Saud University, Riyadh 11451, Saudi Arabia and Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA

  • *rebei@engr.wisc.edu

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Issue

Vol. 83, Iss. 6 — June 2011

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