Direct-Current Induced Dynamics in Co90Fe10/Ni80Fe20 Point Contacts

Preprint

1 September 2003

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0309042

Abstract

We have directly measured coherent high-frequency magnetization dynamics in ferromagnet 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 GHz 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.

Keywords

CURRENT INDUCED DYNAMICS
MAGNETIZATION DYNAMICS
TUNED OVER A RANGE
INDUCED DYNAMICS
SPIN POLARIZED
FERROMAGNET
GIGAHERTZ
FREQUENCY

All Related Versions

Version 1, 2003-09-01, ArXiv
Published version: Physical Review Letters, 92 (2), 027201.

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