Resonant precession modes of a dipole system under a weak AC field

In the ferromagnetic resonance region, precession modes of the total magnetic moment of planar systems of magnetic nanoparticles, coupled by the dipole–dipole interaction under a weak high-frequency field are studied. It is shown that the dipole–dipole interaction, along with a change in the resonant frequency, leads to precession mode nonlinearity. The precession amplitude modulation regions, unstable precession modes, and various chaotic dynamics are revealed, as well as the frequency dependences characteristic of dynamic bistability are revealed. The features of the resonant behavior of systems with various uniaxial magnetic anisotropies of nanoparticles are considered.