title: Chaotic dynamics of spin-valve oscillators.
abstract: 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.
authors.affiliation: Department of Physics and Astronomy, University of Missouri-Columbia, Columbia, Missouri 65211, USA.
authors.forename: Z
authors.initials: Z
authors.lastname: Yang
authors.forename: S
authors.initials: S
authors.lastname: Zhang
authors.forename: Y Charles
authors.initials: YC
authors.lastname: Li