Spin-Transfer Excitations of Permalloy Nanopillars for Large Applied Currents

Details Spin-Transfer Excitations of Permalloy Nanopillars for Large Applied Currents Spin-Transfer Excitations of Permalloy Nanopillars for Large Applied Currents

2005-04-16

arxiv.org/abs/cond-mat/0504402v1

Physics

Condensed Matter

Materials Science

22 pages, 6 figures

Scientific paper

10.1103/PhysRevB.72.064430

Using measurements of the spectra of microwave-frequency resistance oscillations, we determine the phase diagram of magnetic excitations caused by torques from DC spin-polarized currents in (thin permalloy)/copper/(thick permalloy) multilayer samples. We extend the measurements to larger values of current than have been reported previously. We find several additional modes that we are able to identify with motion of the thick magnetic layer as well as the thin one. Peaks in the microwave spectra at multiple frequencies suggest that spatially non-uniform dynamical states can be important in some circumstances. We compare the experimental phase diagram with simple theoretical models and achieve a good qualitative agreement.

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