Study on dynamics of magnetostrictive thin film in hard axis

High driving frequency of magnetic field is one of the key factors which restrict the popularization and application of giant magnetostrictive thin film device.The research on how to reduce the magnetic field driving frequency of giant magnetostrictive thin film device has important significance to the popularization and application of this kind of device.Based on the deep analysis of fundamental reason which cause giant magnetostrictive thin film existing anisotropy,combining the motion mechanism of domains in the magnetostrictive process of thin film,the paper puts forward a new idea that as long as it is able to overcome the demagnetizing field existing in giant magnetostrictive thin film,better dynamic characteristics can be obtained in the direction of hard magnetization axis under low driving frequency of magnetic field.An experiment is carried out in the hard magnetization axis experimental system of giant magnetostrictive thin film.The results show that it is able to make the thin film generate superharmonic resonance with excellent response through applying a suitable bias magnetic field to overcome demagnetizing field.The experimental results provide a new way for reducing the diving frequency of giant magnetostrictive thin film device.