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镍锌软磁铁氧体由于其高的电阻率和低损耗,成为了在高频领域应用最广泛的软磁材料。本论文使用溶胶凝胶法制备了纳米多晶铁氧体薄膜Ni_(0.5)Zn_(0.4)Cu_(0.1)Fe_(2-x)La_xO_3(x=0~0.05)。分别通过利用X射线衍射仪,振动样品磁强计和阻抗分析仪对样品的微结构和磁电性能进行了研究。结果表明样品的饱和磁化强度和矫顽力随着镧含量的增大逐步的减小。另外,我们分析了样品不同频率下的真实磁导率和不同镧浓度下的有用磁导率。由于镧掺杂导致的磁稀释和不纯相的影响,使得样品的真实磁导率呈现先增大后减小的变化趋势。
Nickel-zinc ferrite has become the most widely used soft magnetic material in the high frequency range because of its high resistivity and low loss. In this paper, Ni 0.5 Zn 0.40 Cu 0.1 Fe 2-x La x O 3 (x = 0 ~ 0.05) was prepared by sol-gel method. The microstructure and magnetoelectric properties of the samples were investigated by using X-ray diffractometer, vibrating sample magnetometer and impedance analyzer respectively. The results show that the saturation magnetization and coercivity of samples decrease gradually with the increase of lanthanum content. In addition, we analyzed the real magnetic permeability at different frequencies of the sample and the useful magnetic permeability at different lanthanum concentrations. Due to the influence of magnetic dilution and impure phase caused by lanthanum doping, the real magnetic permeability of samples increases first and then decreases.