Abstract
The dependences of spin wave resonance(SWR)frequency on the surface anisotropy field,interface exchange cou-pling,symmetry,biquadratic exchange(BQE)interaction,film thickness,and the external magnetic field in bilayer ferro-magnetic films are theoretically analyzed by employing the linear spin wave approximation and Green's function method.A remarkable increase of SWR frequency,except for energetically lower two modes,can be obtained in our model that takes the BQE interaction into account.Again,the effect of the external magnetic field on SWR frequency can be increased by increasing the biquadratic to interlayer exchange ratio.It has been identified that the BQE interaction is of utmost impor-tance in improving the SWR frequency of the bilayer ferromagnetic films.In addition,for bilayer ferromagnetic films,the frequency gap between the energetically highest mode and lowest mode is found to increase by increasing the biquadratic to interlayer exchange ratio and film thickness and destroying the symmetry of the system.These results can be used to improve the understanding of magnetic properties in bilayer ferromagnetic films and thus may have prominent implications for future magnetic devices.
基金项目
Natural Science Foundation of Inner Mongolia of China(2019MS01021)
Research Program of Science and Technology at Universities of Inner Mongolia Autonomous Region,China(NJZY21454)
Theoretical Physics Discipline Development and Communication Platform of Inner Mongolia University(12147216)
NETL
NSTL
万方数据