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Frequency modulation of spin torque oscillator pairs

Journal article
Authors Yevgen Pogoryelov
Pranaba Muduli Kishor
Stefano Bonetti
Ezio Iacocca
Fred Mancoff
Johan Åkerman
Published in Applied Physics Letters
Volume 98
Issue 19
Pages 192501
ISSN 0003-6951
Publication year 2011
Published at Department of Physics (GU)
Pages 192501
Language en
Links dx.doi.org/10.1063/1.3588218
Keywords magnetism, spintronics, microwave electronics
Subject categories Other engineering physics, Magnetism

Abstract

The current controlled modulation of nanocontact based spin torque oscillator (STO) pairs is studied in both the synchronized and nonsynchronized states. The synchronized state shows a well behaved modulation and demonstrates robust mutual locking even under strong modulation. The power distribution of the modulation sidebands can be quantitatively described by assuming a single oscillator model. However, in the nonsynchronized state, the modulation sidebands are not well described by the model, indicating interactions between the two individual nanocontact STOs. These findings are promising for potential applications requiring the modulation of large synchronized STO arrays.

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