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Integrated Ferroelectrics
An International Journal
Volume 125, 2011 - Issue 1
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Original Articles

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

P. K. Muduli Physics Department, University of Gothenburg, 412 96, Gothenburg, Sweden
,
Ye. Pogoryelov Materials Physics, Royal Institute of Technology, Electrum, 229, 164 40 Kista, Sweden
,
Y. Zhou Materials Physics, Royal Institute of Technology, Electrum, 229, 164 40 Kista, Sweden
,
Fred Mancoff Everspin Technologies, Inc., 1300 N. Alma School Road, Chandler, Arizona, 85224, USA
&
Johan Åkerman Physics Department, University of Gothenburg, 412 96 Gothenburg, Sweden and Materials Physics, Royal Institute of Technology, Electrum, 229, 164 40 Kista, Sweden
Pages 147-154 | Received 02 Sep 2010, Accepted 29 Oct 2010, Published online: 27 Jun 2011
 
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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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