Effect of Sm Volatilization on Magnetic Microstructures of Sintered Sm（Co,Fe,Cu,Zr）z Magnets at High Temperatures  

作　　者：夏爱林 方以坤 郭朝晖 李卫 韩宝善 

机构地区：[1]State Key Laboratory of Magnetism, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080 [2]Division of Functional Materials, Central Iron and Steel Research Institute, Beijing 100081

出　　处：《Chinese Physics Letters》2006年第5期1289-1292,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 10374110 and 50201004.

摘　　要：We present a magnetic force microscopy study of surface magnetic microstructure changes at high temperatures in 2：17-type Sm（Co,Fe, Cu,Zr）z （z ～ 7.4） magnets. Surface magnetic microstructures are found to change greatly in parallel and vertical specimens after heat-treatment at 400℃ for one hour in vacuum of 10^-5 Torr with Ar gas as protecting atmosphere. Changes of microstructures are attributed to the formation of a soft-magnetic surfaces layer in the specimens, resulting from Sm volatilization due to high temperature. This hypothesis is further confirmed by the heat-treatment experiments at 400℃ for 0.5 h and 2 h. Finally, the existence of the soft-magnetic layers, which consist primarily of Fe Co compounds, is verified by the results of both XRD and XPS of the vertical specimens before and after heat-treatment.We present a magnetic force microscopy study of surface magnetic microstructure changes at high temperatures in 2：17-type Sm（Co,Fe, Cu,Zr）z （z ～ 7.4） magnets. Surface magnetic microstructures are found to change greatly in parallel and vertical specimens after heat-treatment at 400℃ for one hour in vacuum of 10^-5 Torr with Ar gas as protecting atmosphere. Changes of microstructures are attributed to the formation of a soft-magnetic surfaces layer in the specimens, resulting from Sm volatilization due to high temperature. This hypothesis is further confirmed by the heat-treatment experiments at 400℃ for 0.5 h and 2 h. Finally, the existence of the soft-magnetic layers, which consist primarily of Fe Co compounds, is verified by the results of both XRD and XPS of the vertical specimens before and after heat-treatment.

关 键 词：PERMANENT-MAGNETS DOMAIN-STRUCTURE 

分 类 号：O482.5[理学—固体物理]