Rippard, W.
, Pufall, M.
, Kaka, S.
, Russek, S.
and Silva, T.
(2004),
Direct-Current Induced Dynamics in Co<sub>90</sub>Fe<sub>10</sub>/Ni<sub>80</sub>Fe<sub>20</sub> Point Contacts, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=31394
(Accessed October 7, 2025)
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Direct-Current Induced Dynamics in Co90Fe10/Ni80Fe20 Point Contacts
Published
Author(s)
, , , ,
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
Pub Type
Journals
Download Paper
Keywords
magnetization dynamics, point contacts, rf excitations, spin transfer
Citation
Issues
If you have any questions about this publication or are having problems accessing it, please contact [email protected].
Created January 15, 2004, Updated October 12, 2021