Frequency modulation of spin-transfer oscillators | Zendy

Matthew R. Pufall | Zendy; William H. Rippard | Zendy; Shehzaad Kaka | Zendy; T. J. Silva | Zendy; Stephen E. Russek | Zendy

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Frequency modulation of spin-transfer oscillators

Author(s) -

Matthew R. Pufall,

William H. Rippard,

Shehzaad Kaka,

T. J. Silva,

Stephen E. Russek

Publication year - 2005

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.1875762

Subject(s) - sideband , physics , magnetization , frequency modulation , amplitude , condensed matter physics , precession , dc bias , magnetic field , radio frequency , optics , voltage , electrical engineering , quantum mechanics , microwave , engineering

Spin-polarized dc electric current flowing into a magnetic layer can induceprecession of the magnetization at a frequency that depends on current. We showthat addition of an ac current to this dc bias current results in a frequencymodulated (FM) spectral output, generating sidebands spaced at the modulationfrequency. The sideband amplitudes and shift of the center frequency with driveamplitude are in good agreement with a nonlinear FM model that takes intoaccount the nonlinear frequency-current relation generally induced by spintransfer. Single-domain simulations show that ac current modulates the coneangle of the magnetization precession, in turn modulating the frequency via thedemagnetizing field. These results are promising for communications and signalprocessing applications of spin-transfer oscillators.Comment: 13 pages, 3 Figure

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