退火温度对钴铁氧体薄膜结构和性能的影响

采用溶胶-凝胶法结合匀胶旋涂工艺在复合基片(Pt/Ti/SiO2/Si)上制备了钴铁氧体(CoFe2O4)薄膜,利用XRD、SEM、VSM分析了薄膜的微结构以及磁性能,研究了不同退火温度对钴铁氧体薄膜的结构和磁性能的影响.结果表明,钴铁氧体在500℃时开始形成尖晶石相.随着退火温度的增高,钴铁氧体晶粒逐渐长大,饱和磁化...

Influence of Annealing Temperature on Microstructure and Magnetic Properties of Co-ferrite Thin Films

Co-ferrite thin films have been synthesized on Pt/Ti/SiO2/Si substrates by the sol-gel spin-coating technique annealed at temperatures ranging from 400 to 700 ℃ in air.The structure and magnetic properties were analyzed by X-ray diffraction,scanning electron microscopy and vibrating sample magnetometer.Impact of different annealing temperature on microstructure and magnetic properties of Co-ferrite thin films was also dealt with.The results show that spinel phase begins to form at 500 ℃,and the grain size,saturation magnetization and coercivity increase gradually with the increase of annealing temperature.When annealing temperature is 600 ℃,the spinel phase exists,the distribution of grain particle sizes is uniform,saturation magnetization and coercivity are 427.48 emu·cm-3 and 1224.11 Oe,respectively.When the annealing temperature is 700 ℃,the grain grew further,but the anti-ferromagnetic α-Fe2O3 exists and cracks appear,which leads to the decrease of saturation magnetization and coercivity.