Studies On Preparation And Magnetic-electric Properties Of Zn Ferrite Thin Films

A brief summarize for preparation measures of nanosized Zn ferrite was made in this paper. Zno.3Fe2.7O4 nanoparticles were prepared by chemical coprecipitation method. X-ray diffraction(XRD)demonstrated the sample of ZnxFe3-xO4 had spinel structure,and we got the typical M-H curves for Zn0.3Fe2.7O4 by vibrating sample magnetometer(VSM). The Zn0.3Fe2.7O4 nanocrystallites exhibit superparamagnetism at room temperature. In this dissertation,for the purpose of enlarging saturation magnetization of Zn ferrite thin films,the effect of preparing process parameters of sputtering pressure, substrate temperature, and annealing process parameters on the proerties of Zn ferrite thin films prepared by radio frequency(RF)magnetron sputtering technique were investigated.The magnetic proPerties, electrical properties and spin dependent transport properties were investigated by vibrating sample magnetometer and magneto - electronic measurement system.The Si substrate significantly affect the films’preferred orientation.in the annealing process. The substrate temperature affect the migration ability of deposited particles,thus a suitable substrate temperature facilitate films’crystallization,reduce defection,and optimize magnetic properties as well.The sputtering Ar pressure play an important role in nucleation ration. The annealing temperature decide the degree of film crystallization and grain size respectively. The relation of MR and resistivity at different temperature was studied.Through the research of RF magnetron sputtering technique to prepare Zn ferrite thin films,we optimize processing parameters.The film prepared at optimal conditions has the performance of Ms with 700 emu/cm3 and He with 307Oe.