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Spin-torque oscillator linewidth narrowing under current modulation

Journal article
Authors Yevgen Pogoryelov
Pranaba Muduli Kishor
Stefano Bonetti
Fred Mancoff
Johan Åkerman
Published in Applied Physics Letters
Volume 98
Issue 19
Pages 192506
ISSN 0003-6951
Publication year 2011
Published at Department of Physics (GU)
Pages 192506
Language en
Keywords magnetism, spintronics, microwave electronics
Subject categories Magnetism, Other engineering physics


We study the behavior of the linewidth of a nanocontact based spin torque oscillator (STO) under application of a radio frequency (100 MHz) modulating current. We achieve a significant (up to 85%) reduction in the STO linewidth when it is modulated across a region of high nonlinearity. The mechanism responsible for the linewidth reduction is the nonlinear frequency shift under the influence of current modulation, which reduces the nonlinear amplification of the linewidth. The reduction in the linewidth during modulation can be quantitatively calculated from the free-running behavior of the STO.

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