| 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 |
| Volume: |
92 |
| Issue: |
2 |
| Pages: |
pp. 027201-1 - 027201-4 |
| Keywords: |
magnetization dynamics;point contacts;rf excitations;spin transfer |
| Research Areas: |
Electromagnetics |
| PDF version: |
 Click here to retrieve PDF version of paper (388KB) |
