Spin-torque driven ferromagnetic resonance in a nonlinear regime

Details Spin-torque driven ferromagnetic resonance in a nonlinear regime Spin-torque driven ferromagnetic resonance in a nonlinear regime

2009-10-24

arxiv.org/abs/0910.4678v1

Applied Physics Letters 95, 172513 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, to appear in Applied Physics Letters

Scientific paper

10.1063/1.3254242

Spin-valve based nanojunctions incorporating Co|Ni multilayers with perpendicular anisotropy were used to study spin-torque driven ferromagnetic resonance (ST-FMR) in a nonlinear regime. Perpendicular field swept resonance lines were measured under a large amplitude microwave current excitation, which produces a large angle precession of the Co|Ni layer magnetization. With increasing rf power the resonance lines broaden and become asymmetric, with their peak shifting to lower applied field. A nonhysteretic step jump in ST-FMR voltage signal was also observed at high powers. The results are analyzed in in terms of the foldover effect of a forced nonlinear oscillator and compared to macrospin simulations. The ST-FMR nonhysteretic step response may have applications in frequency and amplitude tunable nanoscale field sensors.

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