Exchange-coupling interaction and effective anisotropy in nanocomposite permanent materials  

作　　者：Ruwei Gao Weicun Feng Wei Chen Biao Wang Guangbing Han Peng Zhang 

机构地区：[1]Shandong Univ, Sch Phys & Microelect, Jinan 250100, Peoples R China

出　　处：《Chinese Science Bulletin》2002年第14期1166-1169,共4页

基　　金：This work was supported by the National Natural Science Foundation of China (Grant No. 59971026);the Science Foundation of Shandong Province (Grant No. Y2000F10).

摘　　要：Taking Nd2Fe14B/α-Fe as example, the exchange-coupling interactions between magnetically soft and hard grains in nanocomposite permanent materials and their effects on the effective anisotropy of materials were investigated. The calculation results expressed that the exchange-coupling interactions are enhanced with the reduction of grain size, and the effective anisotropy of materials decreases with the reduction of gram size and the increase of magnetically soft phase component. The remanence and the effective anisotropy of materials possess the opposite variation trend with the change of grain size and phase ratio. The mean grain size should be in the range of 10-15 nm and the ratio of soft phase should be less than 50% for getting the magnet with high energy product.Taking Nd2Fe14B/α-Fe as example, the exchange-coupling interactions between magnetically soft and hard grains in nanocomposite permanent materials and their effects on the effective anisotropy of materials were investigated. The calculation results expressed that the exchangecoupling interactions are enhanced with the reduction of grain size, and the effective anisotropy of materials decreases with the reduction of grain size and the increase of magnetically soft phase component. The remanence and the effective anisotropy of materials possess the opposite variation trend with the change of grain size and phase ratio. The mean grain size should be in the range of 10–15 nm and the ratio of soft phase should be less than 50% for getting the magnet with high energy product.

关 键 词：NANOCOMPOSITE PERMANENT MATERIALS EXCHANGE-COUPLING interaction EFFECTIVE anisotropy. 

分 类 号：O482.5[理学—固体物理]