晶粒间界相对纳米硬磁材料各向异性的影响  

Effect of intergranular phase on the anisotropy of nanometer hard magnetic materials

作　　者：孙艳[1] 高汝伟[1] 冯维存[2] 韩广兵[1] 

机构地区：[1]山东大学物理与微电子学院,山东济南250100 [2]钢铁研究总院功能材料所,北京100081

出　　处：《功能材料》2006年第11期1732-1733,共2页Journal of Functional Materials

基　　金：国家自然科学基金(50371046)高等学校博士学科点专项科研基金(20040422012)

摘　　要：采用立方晶粒结构模型研究了晶粒间界相对纳米硬磁材料交换耦合相互作用和有效各向异性的影响。结果表明,晶粒间界相减弱了交换耦合作用,使晶拉的平均各向异性〈K〉增加,有助于提高材料的有效各向异性K_(eff)；而非磁性晶粒间界相又会使K_(eff)降低,导致K_(eff)在间界相为某一厚度d时取极大值。适当厚度的晶粒间界相可以提高材料的有效各向异性和矫顽力。The effect of intergranular phase on the exchange-coupling interaction and effective anisotropy of nanometer hard mangnetic material has been investigated by adopting cubic model of grain. The results show that the exchange-coupling interaction between grains is weakened by intergranular phase, that increases the average anisotropy of grain 〈K）, which leads the increase of the effective anisotropy Keff of material. However, the nonmagnetic intergranular phase could also decrease Keff. The two contrary affection factors restrict each other and result the maximum value of Keff at certain thickness of intergranular phase d. The exsit of intergranular phase with suitable thickness may result the increase of the effective anisotropy and coercivity of material.

关 键 词：交换耦合相互作用 晶粒间界相 有效各向异性 

分 类 号：O482.54[一般工业技术—材料科学与工程] TM273[理学—固体物理]