Effect of thermal fluctuations on the spin self-oscillations in a microwave nanosized oscillator |
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Authors: | A F Popkov M Yu Chinenkov |
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Institution: | (1) Lukin Scientific Research Institute of Physical Problems, Zelenograd, Moscow, 124460, Russia;(2) Moscow Institute of Electronic Engineering (State Technological University), Moscow, 124498, Russia |
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Abstract: | Reduced equations are derived for the slow evolution of the phase and amplitude of spin self-oscillations arising in a free magnetic layer of a nanosized microwave oscillator under the action of an over-threshold spin-polarized current. These equations are used to calculate the spectral intensity of the fundamental-harmonic signal of a spin self-oscillator allowing for thermal noise in the spin subsystem. It is shown that the line width as a function of the current is determined by a bifurcation-type variation in the spin state near the self-oscillation threshold. The self-oscillation nonisochronism makes the spectral line profile asymmetric. The line-profile asymmetry can change as the cycle-appearance point is approached. |
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