Spectrum and the temperature characteristic of the surface magnetostatic wave in the single-crystal ferrite film

The model of a film of cubic ferrite is constructed for studying the magnetostatic wave characteristics under conditions of tangent magnetization. Anisotropic properties of the film material are taken into consideration by means of a tensor of effective demagnetization factors. In this case the corners determining the crystallographic orientations of the film and of the equilibrium magnetization vector enter the model in the form of variable parameters. The temperature coefficient of frequency is calculatedfor the surface magnetostatic wave. It is shown that taking into account the temperature derivative of the effective field of magnetic anisotropy is very important. The general contribution to the temperature coefficient value connected with this derivative can be comparable to the contribution associated with the temperature derivative of saturation magnetization. It is found that there are crystallographic orientations of the film and the magnetization vector for which both contributions partially or completely compensate each other. This property allows the magnetic crystallographic anisotropy to be used for improvement of the temperature stability of spin-wave devices.

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