Co淀积到γ-Fe_2O_3表面的光电发射谱研究  

A STUDY OF Co EVAPOURATING ON γ-Fe-2O_3 SURFACE BY PHOTOEMISSION SPECTROSCOPY

作　　者：伍乃娟 齐上雪 曹建明 谢侃[1] 

机构地区：[1]中国科学院物理研究所

出　　处：《物理学报》1989年第5期859-863,共5页Acta Physica Sinica

摘　　要：在γ-Fe_2O_3表面蒸镀不同厚度Co,观察到低Co覆盖度,Co具有很大活力与O_2结合,而使Fe还原.在θ=0.2—0.8时,表面上形成类 CoFe_2O_4.Co覆盖度进一步增加,Fe在表面偏析,Co开始形成第二层,破坏了形成这种氧化物的条件.因此,这种铁钴氧化物与单层或亚单层包钴磁粉磁性的改善可能有密切关系.The γ-Fe_2O_3 surface evapourated with Co has been studied by photoemission spectros-copy. The results show that at low coverage, Co is very active and combined with the oxygen in y-Fe_2O_3, while Fe in y-Fe_2O_3 was reduced; at the coverage of 0.2-0.8 monolayer, some kind of CoFe_2O_4-like oxide was formed on the surface; with further Co coverage increasing, the Fe in the bulk began to segregate to the surface and the second monolayer of Co began to form on the surface, which destroyed the condition favourable to the formation of the oxide. We can conclude from these results that the magnetism improvement of magnetic powder coated with one- or sub- monolayer Co may have strong relation to the presence of this CoFe_2O_4-like oxide.

关 键 词：CO淀积 Γ-FE2O3 磁粉 光电发射谱 

分 类 号：O482.54[一般工业技术—材料科学与工程]