Direct-current induced dynamics in Co90 Fe10/Ni80 Fe20 point contacts.
Phys Rev Lett
; 92(2): 027201, 2004 Jan 16.
Article
in En
| MEDLINE
| ID: mdl-14753964
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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Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Phys Rev Lett
Year:
2004
Document type:
Article
Affiliation country:
Estados Unidos