Electronic structure and magnetism of compound Nd_2Fe_(17)N_3

The electronic structure and magnetism of compound Nd\-2Fe 17 N\-3 has been studied with MS_Xα method. It was found that there are negative exchange couplings between Fe(f) and Fe(c) atoms in Nd\-2Fe 17 N x compounds. The interstitial N atoms make the unit cell volume of the compounds increase a little, and hence the strength of negative exchange coupling decreases.     

不同温度下Nd_2Fe_(14)B永磁体畴壁中磁矩的转向公式

考虑二级磁晶各向异性常数 ,精确地推导出了自旋重取向温度以上的Nd2 Fe14 B磁体 180°畴壁中磁矩的转向公式和自旋重取向温度以下的Nd2 Fe14 B磁体畴壁中磁矩的转向公式。这些公式也适用于具有类似Nd2 Fe14 B结构和性质的其它永磁体。     

Co含量对Fe_(1-x)Co_x-SiO_2纳米合金颗粒体晶体结构和磁性的影响

利用溶胶法制备了Fe1-xCOx-SiO2纳米颗粒体材料，并首次利用X射线衍射仪（XRD）、透射电子显微镜（TEM）和振动样品磁强计（VSM）研究了这种材料中Co含量（占Fe-Co合金的原子百分比）对晶体结构和磁性的影响．结果表明，样品中Fe-Co合金微粒的晶体结构与Co含量的关系和大块Fe-Co合金相似;合金微粒的比饱和磁化强度随Co含量的变化规律与粉状纯Fe-CO合金相似．     

BEHAVIORS OF THE HYPERFINE FIELD AND THE ATOMIC MAGNETIC MOMENT IN AMORPHOUS Fe80-xTxB20（T=Co,Ni ,Mn ,V,Ti） ALLOYS

The mean hyperfine field at the Fe nuclei in amorphous alloys Fe_(■0-x)T_xB_(20)(T=Co,Ni, Mn, V, Ti) by fitting the Mossbauer spectra is displayed. The behaviors of both the hyperfine field and the atomic magnetic moment in these amorphous alloys and the relation between both the properties are discussed.