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) |
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Hauptverfasser: | , , , |
Format: | Artikel |
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. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.5004117 |