Effect of annealing parameters on the magnetic properties of NiZn ferrite thin films
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Ni0.5Zn0.5Fe2.0O4.0 thin films (NZFs) were deposited on Si (100) substrate by a sol–gel method, and the effects of annealing parameters on the structure and magnetic properties of the proposed films were investigated. Moderate heating rate was beneficial to the nucleation of NZFs. When the heating rate was 2 °C/min the saturation magnetization (Ms) achieved its maximum and the coercivity (Hc) reached its minimum. Both the crystallization and Ms of NZFs enhanced with increasing annealing time; however, Hc changed contrarily. High quenching temperature produced a large stress and consequently deteriorated magnetic properties. The optimal annealing parameters of NZFs were annealed at 700 °C, heating rate 2 °C/min, annealing time 1 h, and gradually cooled to room temperature. Finally, NZFs showed a high magnetization of 320 emu/cm3 and low coercivity of 86 Oe.
KeywordsFerrite Annealing Time High Heating Rate NiZn Increase Annealing Time
The authors would like to thank Prof. Y. Jin for the XRD measurements and Mr. Y. F. Tian for the AFM measurements and their helpful discussion.
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