Microstructure and Magnetostriction of Sm-Fe GMFs

摘要

In this paper, both technologies of ion beam sputtering deposition (IBSD) and vacuum casting alloy target were used to fabricate Sm-Fe giant magnetostrictive thin films (Sm-Fe GMFs). The films were annealed at different temperatures under vacuum condition. The results showed that under the fixed fabrication procedure of IBSD, compact amorphous Sm-Fe GMFs with smooth surface and high interfacial adhesion had been deposited. With post-annealing temperature rising, the microstructure of the films had been changed as following order: amorphous → amorphous+microcrystalline→nano-polycrystalline (crystallization temperature was about 400℃), and magnetostriction of films had changed as well. It was note that after properly annealing, the magnetostriction of Sm-Fe GMFs could be drastically improved (λ could reach about -350×10-6 at an applied magnetic field of SOKA·m-1).