Open AccessNonlinear magnetization dynamics excited by the spin-transfer torque effect
Author(s) -
Jin Wei,
Wan Zhen-Mao,
Yaowen Liu
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.017502
Subject(s) - magnetization , physics , magnetization dynamics , condensed matter physics , chaotic , oscillation (cell signaling) , spin transfer torque , excited state , spin (aerodynamics) , nonlinear system , torque , current (fluid) , dynamics (music) , magnetic field , quantum mechanics , thermodynamics , artificial intelligence , biology , computer science , acoustics , genetics
The macrospin model based on Landau-Lifshitz-Gilbert equation is used to study the current-induced magnetization dynamics in magnetic spin valves. We find that the DC spin-polarized current could either switch the magnetization of free layer or excite the steady-state precessional motion via the so-called spin-transfer torque effect. The AC current could drive the chaotic oscillations. The route to chaotic oscillation depending on the strength of current is demonstrated through a series of period doubling bifurcations.