Phys. Rev. Lett. 92, 027201 (2004) [4 pages]Direct-Current Induced Dynamics in Co90Fe10/Ni80Fe20 Point Contacts
See accompanying Physics Focus 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. URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.027201
DOI:
10.1103/PhysRevLett.92.027201
PACS:
75.47.–m, 75.75.+a, 85.75.–d
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.