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. 2004 Jan 16;92(2):027201.
doi: 10.1103/PhysRevLett.92.027201. Epub 2004 Jan 15.

Direct-current induced dynamics in Co90 Fe10/Ni80 Fe20 point contacts

W H Rippard  1 , M R Pufall, S Kaka, S E Russek, T J Silva
Affiliations

Direct-current induced dynamics in Co90 Fe10/Ni80 Fe20 point contacts

W H Rippard et al. Phys Rev Lett. .

Abstract

We have directly measured coherent high-frequency magnetization dynamics in ferromagnetic films induced by a spin-polarized dc current. The precession frequency can be tuned over a range of several gigahertz by varying the applied current. The frequencies of excitation also vary with applied field, resulting in a microwave oscillator that can be tuned from below 5 to above 40 GHz. This novel method of inducing high-frequency dynamics yields oscillations having quality factors from 200 to 800. We compare our results with those from single-domain simulations of current-induced dynamics.

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