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用自穿孔方法制得了Ｃｏ－γ－Ｆｅ２Ｏ３作高分辨电镜分析用的火棉胶微栅支持膜。对磁粉颗粒的ＥＤＳ线扫描表明Ｃｏ铁氧体主要分布在以γ－Ｆｅ２Ｏ３为芯的表面层，高分辨电子显微像表明表面层Ｃｏ铁氧体的结晶方向为［１１０］平行于长轴，其厚度在２ｎｍ左右，ＣｏＦｅ２Ｏ４外延生长取向并非与芯部γ－Ｆｅ２Ｏ３完全一致。
Co-γ-Fe2O3 was prepared by self-perforation method for high-resolution electron microscopy analysis of collodion mica grid support film. EDS line scanning of the magnetic particles indicates that Co ferrite is mainly distributed on the surface layer with γ-Fe2O3 as the core. The high-resolution electron micrographs show that the crystal orientation of the surface layer Co ferrite is parallel to the long axis [110] The thickness of about 2nm, CoFe2O4 epitaxial growth orientation is not completely consistent with the core γ-Fe2O3.