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Spin Torque Oscillators and RF Currents—Modulation, Locking, and Ringing

Journal article
Authors Pranaba Muduli Kishor
Yevgen Pogoryelov
Yan Zhou
Fred Mancoff
Johan Åkerman
Published in Integrated Ferroelectrics
Volume 125
Issue 1
Pages 147
ISSN 1058-4587
Publication year 2011
Published at Department of Physics (GU)
Pages 147
Language en
Links www.tandfonline.com/doi/abs/10.1080...
ttps://doi.org/10.1080/10584587.201...
Keywords magnetism, spintronics, microwave electronics
Subject categories Magnetism, Other engineering physics

Abstract

We study the interaction between a nano-contact spin torque oscillator (STO) and injected radio-frequency and microwave currents. Modulation of the STO signal is observed over a wide frequency range from 100 MHz to 3.2 GHz. The modulation sidebands agree well with macrospin simulations. When the injected microwave frequency approaches that of the STO, we observe injection locking, frequency pulling/pushing, and intermodulation peaks. While the intermodulation peaks are reasonably well reproduced by macrospin simulations, they do not follow the Adler's model. We argue that this discrepancy is due to intrinsic ringing effects stemming from the internal dynamics of the STO.

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