Study on characteristics of CU substrate giant magnetostrictive thin film based in the direction of hard magnetization axis

摘要

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 great significance to the popularization and application of this kind of device. In this paper, the fundamental reason which causes giant magnetostrictive thin film existing anisotropy is analyzed deeply. Based on this, combining with the motion mechanism of magnetic domains in the magnetostriction process of thin film, 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 the action of magnetic field with low driving frequency is proposed. An experimental system of giant magnetostrictive film is established and an experiment is carried out in the system. The results show that demagnetizing field can be overcome through applying an appropriate bias magnetic field, and thin film may generate excellent superharmonic resonance in hard magnetization axis direction. The experimental results provide a new way for the development of giant magnetostrictive thin film device with low driving frequency.