Nonlinear regimes of resonance precession of magnetic moments in a two-layered structure with antiferromagnetic coupling

Dynamic behavior of the magnetization in a system of two magnetic layers with an antiferromagnetic coupling was studied in a transverse ac magnetic field. A number of new effects were revealed such as a reorientation phase transition upon a change in the amplitude (frequency) of a high-frequency field; additional resonance of the precessional motion of magnetic moments of both films with a doubled (relative to the high-frequency field) period; a precessional regime with a doubled period of vibrations of the magnetic moment of only one of the films; an oscillatory regime characterized by large amplitudes and a large period exceeding that of the ac field by a factor of several dozen times.