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Modulation of Individual and Mutually Synchronized Nanocontact-Based Spin Torque Oscillators

Journal article
Authors Pranaba Muduli Kishor
Yevgen Pogoryelov
Fred Mancoff
Johan Åkerman
Published in IEEE transactions on magnetics
Volume 47
Issue 6
Pages 1575 Part:1
ISSN 0018-9464
Publication year 2011
Published at Department of Physics (GU)
Pages 1575 Part:1
Language en
Links dx.doi.org/10.1109/TMAG.2010.209646...
Keywords magnetism, spintronics, microwave electronics
Subject categories Other engineering physics, Magnetism

Abstract

We study current modulation of spin torque oscillators (STOs) based on single and double nano-contacts. For single nano-contact devices, we show modulation for a carrier frequency of 19-40 GHz and modulation frequencies from 50 MHz to 1 GHz. We show that the behavior of modulation and the asymmetry in the power of the modulation sidebands can be very well modeled, and predicted, using nonlinear frequency and amplitude modulation (NFAM) calculations based on the free-running STO parameters. Modulation of synchronized double nano-contact STOs is equally well modeled by NFAM theory and demonstrates the feasibility of communication applications based on arrays of synchronized STOs.

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