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Two-level fluctuations of the magnetization state of pseudo spin-valvepillars Co(10 nm)/Cu(10 nm)/Co(30 nm) embedded in electrodeposited nanowires(~40 nm in diameter, 6000 nm in length) are triggered by spin-polarizedcurrents of 10^7 A/cm^2 at room temperature. The statistical properties of theresidence times in the parallel and antiparallel magnetization states revealtwo effects with qualitatively different dependences on current intensity. Thecurrent appears to have the effect of a field determined as the bias fieldrequired to equalize these times. The bias field changes sign when the currentpolarity is reversed. At this field, the effect of a current density of 10^7A/cm^2 is to lower the mean time for switching down to the microsecond range.This effect is independent of the sign of the current and is interpreted interms of an effective temperature for the magnetization.Comment: 4 pages, 5 figures, revised version, to be published in Phys. Rev.  Let

physical review letters

Current-Induced Two-Level Fluctuations in Pseudo-Spin-Valve (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">C</mml:mi><mml:mi mathvariant="normal">o</mml:mi><mml:mo>/</mml:mo><mml:mi mathvariant="normal">C</mml:mi><mml:mi mathvariant="normal">u</mml:mi><mml:mo>/</mml:mo><mml:mi mathvariant="normal">C</mml:mi><mml:mi mathvariant="normal">o</mml:mi></mml:math>) Nanostructures

Current-Induced Two-Level Fluctuations in Pseudo-Spin-Valve (Co/Cu/Co) Nanostructures