Shape and magnetic moment dependence of the dipolar field in Mn_(12)-acetate  

作　　者：ZHOU YuRong LI YanRong ZUO JunWei LIU RuiYuan WANG YunPing 

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2010年第8期1568-1570,共3页中国科学:物理学、力学、天文学(英文版)

基　　金：supported by the National Basic Research Program of China(Grant No. 2006CB921304)

摘　　要：There is a small fraction of fast-relaxation species in Mn12-acetate, which is utilized to determine the dipolar field of Mn12. Here we report an easier way to precisely obtain the dipolar field by measuring the M-H curves above the blocking temperature of fastrelaxation species. We found that there is a simple linear relationship between the magnetic moment and dipolar field; besides the dipolar field is also dependent on the sample shape, which is consistent with the numerical calculation.There is a small fraction of fast-relaxation species in Mn12-acetate, which is utilized to determine the dipolar field of Mn12. Here we report an easier way to precisely obtain the dipolar field by measuring the M-H curves above the blocking temperature of fastrelaxation species. We found that there is a simple linear relationship between the magnetic moment and dipolar field; besides the dipolar field is also dependent on the sample shape, which is consistent with the numerical calculation.

关 键 词：molecular magnet quantum tunneling dipolar field magnetic relaxation 

分 类 号：O469[理学—凝聚态物理]