Physics – Condensed Matter – Materials Science
Scientific paper
2003-12-18
Physics
Condensed Matter
Materials Science
21 pages, 7 figures, minor revisions in response to Phys. Rev. B referees
Scientific paper
10.1103/PhysRevB.69.184406
We observe magnetization dynamics induced by spin momentum transfer in the noise spectra of current perpendicular to the plane giant magnetoresistance spin valves. The dynamics are observable only for those combinations of current direction and magnetic configuration in which spin transfer acts to reorient the free layer magnetization away from the direction set by the net magnetic field. Detailed measurements as a function of magnetic configuration reveal an evolution of the noise spectra, going from a spectrum with a well-defined noise peak when the free layer is roughly collinear with the pinned layer to a spectrum dominated by 1/f noise when the free layer is in an orthogonal configuration. Finally, the amplitude of the corresponding resistance noise increases rapidly with increasing current until it saturates at a value that is a substantial fraction of the magnetoresistance between parallel and antiparallel states.
AlHajDarwish M.
Covington Mark
Ding Yanxia
Gokemeijer N. J.
Seigler M. A.
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