Research On The Preparation And The Magnetic Properties Of The Pr-Fe Based Metallic Spin-glass Films

Spin glass is a system of the magnetic moments arranged randomly.Spin glass has two coordinates-space and time.When the spin-glass frozen behavior occurs, the frozen directions of each magnetic moments of the spin glass are disorder and lost the freedom of rotation, thus exhibiting spatial disorder and an ordered state in time.Metallic glass thin films(MGTFs) possess excellent mechanical properties as the bulk metallic glass(BMG),such as the high strength, high hardness, large elastic limit, and good corrosion resistance.Furthermore,the special nano-thickness property makes it to be the perfect structural and functional materials applied in micro-electro-mechanical systems and nano-devices. It is of great significance for microelectronic device application to study its special magnetic properties.The previous study of spin-glass is basically for the crystalline bulk materials, and the amorphous spin-glass material possess the characters of both spin glass and traditional metallic glass materials. In this thesis, we use single-target magnetron sputtering to prepare Pr-Fe based metallic spin-glass films by doping Fe to Pr alloy target,and investigate the surface morphology, microstructure and crystallization behavior of Pr-Fe metallic spin-glass films with different components.When studying the magnetic characteristics of amorphous spin glass film whose composition is Pr36.7Al25.1Ni9.1Cu22.8Fe20.3, we can know that the obtained sample film is containing both ferromagnetic phase and antiferromagnetic phase.When the applied magnetic field increases, the magnetization of ZFC and FC decreases, showing the intrinsic dependence on the applied magnetic field. The peak of the ZFC curve shifts to lower temperature as the external magnetic field increases.