Theory of spin torque nano-oscillator-based phase-locked loop

In this paper, we propose an approximate nonlinear theory of a phase-locked loop (PLL) of the spin torque nano-oscillator (STNO). We study the nonlinear dynamics of a filterless PLL generating microwave oscillations in a broad range of frequencies under the spin-polarized electrical current and exte...

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Veröffentlicht in:Journal of applied physics 2017-09, Vol.122 (12)
Hauptverfasser: Mitrofanov, Alexander A., Safin, Ansar R., Udalov, Nikolay N., Kapranov, Mikhail V.
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Sprache:eng
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Zusammenfassung:In this paper, we propose an approximate nonlinear theory of a phase-locked loop (PLL) of the spin torque nano-oscillator (STNO). We study the nonlinear dynamics of a filterless PLL generating microwave oscillations in a broad range of frequencies under the spin-polarized electrical current and external magnetic field. We consider the bifurcation analysis caused by a change in the frequency detuning of synchronized oscillations. We determine the bands of phase locking and quasi-synchronism, which basically distinguish STNOs from other types of microwave oscillators. Finally, we study the amplitude and phase noises of isochronous and nonisochronous STNO-based PLLs and compare them to the analogous characteristics of an autonomous oscillator.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5004117