Specific features in precession dynamics of magnetization of a uniaxial magnetic film

Bifurcation magnetic resonance in type (100) films upon in-plane magnetization

“…The appearance of the bifurcation resonance is due to the said steady state bistability and the closeness of the equilibrium magnetization states: stable in the resonance regions of the field H are the regimes with the trajectories that encircle both equi librium positions. In contrast to the previously consid ered similar resonance effect in the films with uniaxial anisotropy [14,15], in which only chaotic regimes were obtained, in the present case, we have found both harmonic regimes with strongly elongated trajectories and various chaotic regimes in the bifurcation reso nance region. The regular regimes take place primarily at the ends of the frequency interval corresponding to a particular resonance near the field value H k .…”

“…However, according to the FMR experiments with uniaxial films, there is also an addi tional resonance in a narrow range of the system parameters at an intermediate (with respect to the two aforementioned resonances) value of the magnetizing field upon magnetization along the hard axis [13]. Numerical simulation of the magnetization dynamics under such conditions showed that the nature of this effect is associated with the presence of the angular bistability of the magnetization states [14,15]. In this work, we the magnetization precession upon in plane magnetization along the hard axis in (100) films with a cubic anisotropy and study the resonance phenomena and regions of chaotic oscillations and dynamic bista bility.…”

Bifurcation magnetic resonance in films magnetized along hard magnetization axis

“…The line width of this peak is much less than that of the homogeneous FMR, its position corresponds to the field H C H k and does not depend on the frequency. This peak occurs due to the bifurcation and is associated with bistability arising near the field H k provided by two close equilibrium angular positions [8,9].…”

Switching of precession regimes under the conditions of dynamic bistability of magnetization

“…How ever, experimental investigations and theoretical anal ysis of the ferromagnetic resonance have revealed that the magnetization along the hard magnetization axis in a narrow range of parameters of the system gives rise to an additional resonance for an intermediate (with respect to the two aforementioned resonances) value of the magnetic bias field [13]. The numerical simula tion of the magnetization dynamics under these con ditions has demonstrated that the nature of this effect is associated with the angular bistability of magnetiza tion states [14]. It has also been found that, in the region of the additional resonance, which is referred to as the bifurcation resonance, there is a dynamic bista bility involving regimes with strongly different preces sion amplitudes.…”