Precession Dynamics of the Uniaxial Nanoparticle Magnetization in the Ferromagnetic Resonance Region

The influence of the shape parameter (oblateness) a uniaxial ellipsoidal nanoparticle on dynamics its magnetic moment upon magnetization along symmetry axis and excitation by weak transverse high-frequency field in region parameters where equilibrium external static is noncollinear has been studied. It shown that as oblateness increases, irregularity oscillations which at first affects only their amplitude, but then also time dependence. intervals (or frequency), various nonlinear modes precession are realized --- dynamic bistability, complex spatial attractors chaos, were revealed using bifurcation diagrams. Keywords: nanoparticle, "easy" axis, effective anisotropy, ferromagnetic resonance, high frequency field, regular chaotic precession.