Chaotic dynamics of spin-valve oscillators.
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.
Yang
Z
Z
Department of Physics and Astronomy, University of Missouri-Columbia, Columbia, Missouri 65211, USA.
Zhang
S
S
Li
Y Charles
YC