Magnetostrictions and Magnetic Properties of Nd-Fe-B and SrFe_(12)O_(19)  

作　　者：CHEN Hai-Ying ZHANG Yan YANG Yun-Bo CHEN Xue-Gang LIU Shun-Quan WANG Chang-Sheng YANG Ying-Chang YANG Jin-Bo 陈海英;张焱;杨云波;陈学刚;刘顺荃;王常生;杨应昌;杨金波(School of Physics,Peking University,Beijing 100871;State Key Laboratory for Mesoscopic Physics,Department of Physics,Peking University,Beijing 100871)

机构地区：[1]School of Physics,Peking University,Beijing 100871 [2]State Key Laboratory for Mesoscopic Physics,Department of Physics,Peking University,Beijing 100871

出　　处：《Chinese Physics Letters》2011年第7期271-274,共4页中国物理快报（英文版）

基　　金：by the National Natural Science Foundation of China under Grant Nos 50971003 and 10875007;the New Century Talent Project of the Ministry of Education of China;the National Basic Research Program of China under Grant No 2010CB833104;the Instrumental Analysis Fund of Peking University.

摘　　要：The magnetostrictions of polycrystalline Nd-Fe-B and Sr-ferrite at different temperatures are reinvestigated using a strain gauge rotating-sample method.It is found that the magnetostrictionλs of Nd−Fe-B is+52×10^(−6),and that of Sr-ferrite is−25×10^(-6) under a magnetic field of 8 T at room temperature.The maximum energy product(BH)max of the Nd-Fe-B magnet is improved when the powders are magnetically aligned perpendicular to the pressing direction,whereas that of the Sr-ferrite magnet is better when the powders are aligned parallel to the pressing direction.These experimental results suggest that the magnetostriction can generate compressive strain anisotropy resulting from the inverse effect of the magnetostriction.Thus,the magnetization of materials with a negative coefficient of magnetostriction are easier to be aligned normal to the stress direction,while for the materials with a positive coefficient of magnetostriction,the magnetization is easier to be aligned along the stress direction.Therefore,the magnetostriction anisotropy can be used to improve the alignment of the magnetic powders as well as the performance of the magnets.

关 键 词：TEMPERATURE METHOD POWDERS 

分 类 号：O48[理学—固体物理]