Physics of the Solid State
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- 2022
Precession Dynamics of the Uniaxial Nanoparticle Magnetization in the Ferromagnetic Resonance Region
Shutyi A. M. 1, Vasilevskaya T. M.
2, Sementsov D. I.
1, Eliseeva S.V.
1
1Ulyanovsk State University, Ulyanovsk, Russia
2Ulyanovsk Institute of Civil Aviation named after Chief Marshal of Aviation B.P. Bugaev, Ulyanovsk, Russia
2Ulyanovsk Institute of Civil Aviation named after Chief Marshal of Aviation B.P. Bugaev, Ulyanovsk, Russia
Email: shuty@mail.ru, t_vasilevs@mail.ru, sementsovdi42@mail.ru, eliseeva-sv@yandex.ru
The influence of the shape parameter (oblateness) of a uniaxial ellipsoidal nanoparticle on the dynamics of its magnetic moment upon magnetization along the symmetry axis and excitation by a weak transverse high-frequency field in the region of parameters where the equilibrium magnetic moment of the nanoparticle and the external static field is noncollinear has been studied. It is shown that as the oblateness increases, the irregularity of the oscillations increases, which at first affects only their amplitude, but then also the time dependence. The intervals of the shape parameter (or frequency), where various nonlinear modes of precession are realized - dynamic bistability, complex spatial attractors and chaos, were revealed using bifurcation diagrams. Keywords: ellipsoidal nanoparticle, "easy" axis, effective anisotropy, ferromagnetic resonance, high frequency field, bistability, regular and chaotic precession.
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