【摘要】 化学共沉淀工艺制备Zn_0.2Fe_2.8O₄铁氧体颗粒,颗粒尺寸约300埃,近似呈球状,在其表面外延生长一层钴铁氧体层。测量了矫顽力、铁磁共振线宽随钴含量的变化,得到由于外延层引起的磁各向异性常数K_u约为5×10⁵尔格/厘米³。由实验结果分析,主要是Zn_0.2Fe_2.8O₄颗粒表面与外延生长层相当于两个氧离子层厚所产生的相互作用。更多还原

【Abstract】 The particles of Zn0.2Fe2.8O₄, ferrite are prepared by chemical Co-precipitation. The shape of particles are nearly spherical and their mean diameter is about 300 A. Epitaxial cobalt ferrite layer is coated on their surface. Coercivity Hc and ferromagnetic resonance line width △H are measured. According to, experimental results, the effective mangnetic anisotropy constant Ku is about 5×10⁵ erg/cm². That is induced by interface interaction between the inner core of Zn_0.2Fe_2.8O₄ and Co-Fe epitaxial layer. The distance of interaction is about the total thickness of two oxygen ion layers.更多还原