This article is cited in 7 papers

CONDENSED MATTER

Effect of thermal fluctuations on the spin self-oscillations in a microwave nanosized oscillator

A. F. Popkov^ab, M. Yu. Chinenkov<sup>ab

a</sup> Lukin Scientific Research Institute of Physical Problems, Zelenograd, Moscow, 124460, Russia
^b Moscow Institute of Electronic Engineering (State Technological University), Moscow, 124498, Russia

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.

PACS: 72.25.Ba, 72.70.+m, 73.63.Rt, 75.30.Ds, 76.50.+g, 84.30.Ng

Received: 02.07.2008
Revised: 09.09.2008

 English version: Journal of Experimental and Theoretical Physics Letters, 2008, 88:8, 546–550

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