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 November 21, 2024)
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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
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Keywords
magnetization dynamics, point contacts, rf excitations, spin transfer
Citation
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Created January 15, 2004, Updated October 12, 2021