Ferromagnetic resonance in a uniaxial magnetic film subjected to magnetic biasing along its hard axis

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.…”

Magnetic anisotropy in strained manganite films and bicrystal junctions

“…In this case the external magnetic field is oriented along the hard axis and is varied in vicinity of the uniaxial anisotropy field. The field dependence of the DC magnetic susceptibility in uniaxial ferromagnetic films has a sharp peak in vicinity of H u when the external filed is directed along the hard axis of magnetization [32,33]. Consequently it is possible to obtain a direction and a value of uniaxial anisotropy field by recording the sharp peak of RF absorption that is proportional to the imaginary magnetic susceptibility which in turn is proportional to the DC magnetic susceptibility.…”

Возможности Магнитного Псевдорезонанса В Изучении Тонких Ферромагнитных Пленок С Одноосной Магнитной Анизотропией

“…Последний метод дает наиболее полную информацию о величине, симметрии и направлении внутренних магнитных полей в ферромагнетиках. Недавно в ферромагнитных пленках с плоскостной одноосной анизотропией магнитного поля был обнаружен эффект резкого усиления радиочастотной (РЧ) динамической магнитной восприимчивости [1][2][3]. Он наблюдается, когда внешнее магнитное поле H лежит в плоскости пленки, направлено перпендикулярно ее оси легкого намагничивания n u (и, следовательно, параллельно трудной оси) и проходит через значение H = H u , где H u -поле одноосной внутриплоскостной магнитной анизотропии пленки.…”