A Study Of Spin-Wave Resonance Frequencies In The Magnetic Films

The dependence of spin-wave resonance(SWR)frequencies on the surface anisotropy,the interlayer exchange coupling,the ferromagnetic layer thickness and the external magnetic field in a single/bilayer ferromagnetic film have been investigated by using the linear spin-wave approximation and Green's function technique.First of all,we found that a SWR frequency of system shifts to a higher value corresponding to those of above factors,respectively.To be specific,the linear behavior of SWR frequency curves of all modes is observed as an external magnetic field is increasingly applied,on the contrary,for different surface anisotropy and interlayer exchange coupling.In addition,the mode of the energetically highest can be controlled by the interfacial coupling,the thickness and the symmetry of the film.The energetically lowest four modes can be controlled by the surface anisotropy of A or B layer and the symmetry of the film.The SWR frequency of mode number m(28)1 is almost invisible except for a applied magnetic field.Finally,a notable jump behavior appears in frequencies of the ferromagnetic heterogeneous bilayer films with the shift of interlayer coupling.