Ferrite films with enhanced stability of ferromagnetic resonance frequency

Аннотация

The problem of providing the frequency stability of magnetic vibrations of a ferrite film upon simultaneous changes in two magnetic parameters has been stated. The method of stabilizing the frequency of uniform ferromagnetic resonance at small deviations of the effective magnetization and the field of crystallographic magnetic anisotropy of the ferrite from initial values has been proposed. The equation that relates the frequency variation with variations in the magnetic parameters within a linear approximation has been derived. The possibility of the coefficients at the variations in the magnetic parameters to turn to zero has been investigated. It has been shown that this possibility can be implemented via the proper choice of the crystallographic film orientation and the strength and direction of the magnetizing field. In this case, the frequency shift has been determined by quadratic form over the variations in the magnetic parameters. An example of calculating the quadratic form has been given. The optimized film is compared with a film, the frequency shift of which is determined by a linear dependence on the variations in its magnetic parameters.