Open AccessАналитический подход к определению влияния теплового шума на среднюю частоту и амплитуду спинового генератора
Author(s) -
А.В. Половинкин,
К.Г. Мишагин
Publication year - 2018
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2018.08.45962.17072
Subject(s) - amplitude , physics , isotropy , oscillation (cell signaling) , standard deviation , noise (video) , probability density function , quantum electrodynamics , mathematics , quantum mechanics , statistics , chemistry , computer science , biochemistry , artificial intelligence , image (mathematics)
An axisymmetric model of a spin-transfer nano-oscillator (STNO) under the action of statistically isotropic magnetic-field fluctuations is considered. An expression for the stationary probability-density distribution of the angular coordinates of magnetization vector is analytically derived and used for determining dependences of the mean value and standard deviation of the amplitude and the mean oscillation frequency on the magnitude of current. The phenomenon of noise-induced shifts of the mean values of STNO amplitude and frequency is discovered. The latter effect qualitatively explains the experimentally observed dependences of the generation frequency on the STNO current.