Ferromagnetic Resonance And Stress Effect In Magnetic Multilayer Films

Exchange-biased systems formed by a ferromagnetic film in atomic contact with an antiferromagnetic material have attracted much attention lately because of their interesting physical properties and commercial applications in magnetic memory devices.In recent years,extensive studies have been made on basic properties,the structure,interlayer coupling,interfacial structures and its relative effect in magnetic thin films due to their potential application in magnetic random access memory.In this paper,The ferromagnetic resonant(FMR)frequency in multilayer structures with intensity of interlayer coupling and stress anisotropy has been studied by using the principle of minimal energy.It is found that the FMR frequencies of optical mode and acoustic mode all increase with the increasing external magnetic field.The stress field intensity and direction are more important for FMR frequencies of the system than the interlayer coupling and the exchange anisotropy field.Furthermore,the influence of external stress field direction on the FMR frequencies for the optical mode is stronger than the acoustic mode.On the contrary,the dependence of the FMR frequencies for the acoustic mode on stress field intensity is larger.