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Combined Wide-Narrow Double Modulation of Spin-Torque Oscillators for Improved Linewidth During Communication

Journal article
Authors Yevgen Pogoryelov
Pranaba Muduli Kishor
Johan Åkerman
Published in Ieee Transactions on Magnetics
Volume 48
Issue 11
Pages 4077-4080
ISSN 0018-9464
Publication year 2012
Published at Department of Physics (GU)
Pages 4077-4080
Language en
Links dx.doi.org/10.1109/tmag.2012.220046...
Keywords Frequency modulation, nanocontact, spin-torque oscillator (STO), spintronics
Subject categories Physical Sciences

Abstract

Spin-torque oscillators (STOs) offer the advantage of high modulation rates. However the existence of regions with high-frequency nonlinearity, accompanied by increased signal linewidth, limits both the usable STO frequency range and the minimum frequency of modulation. On the other hand, use of a large modulation frequency increases the frequency modulation (FM) bandwidth. In order to overcome these problems, we propose to simultaneously modulate the STO with two signals having different frequencies. We use a high-frequency, "wide" (f(w) = 500 MHz), modulation signal to improve the STO linewidth. At the same time we use a low-frequency, "narrow"(f(N) = 40 MHz), modulation signal to show successful narrow bandwidth modulation of the improved STO signal. The proposed method of combined wide-narrow double modulation can significantly improve the usable operating frequency range of the STOs for communication applications.

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