Phys. Rev. Lett. 99, 134101 (2007) [4 pages]Chaotic Dynamics of Spin-Valve OscillatorsReceived 24 April 2007; published 25 September 2007 Recent experimental and theoretical studies on the magnetization dynamics driven by an electric current have uncovered a number of unprecedented rich dynamic phenomena. We predict an intrinsic chaotic dynamics that has not been previously anticipated. We explicitly show that the transition to chaotic dynamics occurs through a series of period doubling bifurcations. In chaotic regime, two dramatically different power spectra, one with a well-defined peak and the other with a broadly distributed noise, are identified and explained. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.134101
DOI:
10.1103/PhysRevLett.99.134101
PACS:
05.45.Pq, 75.75.+a, 85.75.−d
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