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Direct-Current Induced Dynamics in Co90Fe10/Ni80Fe20 Point Contacts


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      We have directly measured coherent high-frequency magnetization dynamics in ferromagnet 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 GHz 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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      01 September 2003
      cond-mat/0309042 10.1103/PhysRevLett.92.027201
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