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|Author(s):||William H. Rippard; Matthew R. Pufall; Shehzaad F. Kaka; Stephen E. Russek; Thomas J. Silva;|
|Title:||Direct-Current Induced Dynamics in Co90Fe10/Ni80Fe20 Point Contacts|
|Published:||January 16, 2004|
|Abstract:||We have directly measured coherent high-frequency magnetization dynamics in ferromagnetic films induced by a spin-polarized dc current. The precision 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 oscillation having quality factors from 200 to 800. We compare our results with those from single-domain simulation of current induced dynamics.|
|Citation:||Physical Review Letters|
|Pages:||pp. 027201-1 - 027201-4|
|Keywords:||magnetization dynamics,point contacts,rf excitations,spin transfer|
|PDF version:||Click here to retrieve PDF version of paper (397KB)|