Of Smco And Of Smco / Tbdyfe Film Preparation And Research

The properties of SmCo TbDyFe films and SmCo/TbDyFe bilayer films prepared by D.C.magnetron sputtering were investigated in this paper. The purpose of the research was to find a way to improve the magnetostriction of TbDyFe films,especially in low magnetic field.The optimal technological parameters of SmCo thin films were determined as 60mm distance between the target and the substrate,SOW sputtering power and 1.1 Pa Ar pressure through thorgonal experiments. X-ray diffraction results revealed that the structure of as-deposited SmCo film was amorphous and crystallization happened after the films annealed at 500 in vacuum. The magnetic tests of SmCo thin films showed that its coercivity reduced with the increase of film's thickness while the ratio of Mr/Ms was opposite. The films' coercivity and Mr/Ms declined after it annealed at 500 because the machanism of magnetization were changed from domain wall nailing into magnetic nuclear forming.In this paper,the program of measure system for films' magnetostriction was improved and the influence of TbDyFe thin films' elastic modulus on measurement was also studied.The effects of annealing on the microstructure and magnetic performance of TbDyFe ihin films was researched. The results showed that the microstructure of as-deposited TbDyFe II 1ms were amorphous and the crystal of TbFe2 were found in films after annealing at 500 . Annealing films in vaccum could improve the saturation magnetization Ms and the susceptibility,decrease the coercivity and the saturaion field,and make the direction of the magnetic moments parallel to the film plane.The investigation of the magnetostriction of TbDyFe thin films resulted to the conclution that the heat treatment and the improvement of substrate smoothness could improve films' magnetostriction. The better magnetostriction of TbDyFe thin films was 120X 10-6 in 100kA/m and 240 X 10-6 in 330kA/mThe research on the magnetostriction of SmCo/TbDyFe bilayer films indicated that SmCothin films could improve the magnetostricion of TbDyFe thin films effectively through improving its saturation magnetization Ms and susceptibility. The better magnetostriction of SmCo/TbDyFe bilayer films was 140 X 10-6 in 100kA/m and 320 X10-6 in 330kA/m...