Condensed Matter Physics, 2014, vol. 17, No. 1, 13801:17
DOI:10.5488/CMP.17.13801
arXiv:1403.1688
Title:
Transition from one to twomode generation regime in spintorque nanooscillator mediated by thermal noise
Author(s):

D.V. Slobodianiuk
(Taras Shevchenko National University of Kyiv, 64 Volodymyrs'ka Str., 01601, Kyiv, Ukraine)

Twomode model of spintorque nanooscillator (STNO) under the action of thermal noise is considered.
Langevin equations for mode amplitudes were derived starting from general nonlinear oscillator model.
Stationary probability distribution function describing mean mode generation powers was obtained using FokkerPlanck equation.
It was shown that thermal noise can lead to twomode generation in STNO. An increase of thermal noise power leads to excitation
of the second mode in a system and to a twomode generation regime through intermediate state when two modes coexist only in some range of the applied currents.
Key words:
spin transfer torque, thermal noise, generation
PACS:
84.40.x, 84.30.Ng, 85.75.d
