【作者】 骆军； 梁敬魁； 刘泉林； 刘福生； 张毅； 陈景然； 杨林涛； 饶光辉；

【Author】 J. Luo, J. K. Liang, Q. L .Liu, F. S. Liu, Y. Zhang, J. R. Chen, L. T. Yang, G. H. Rao Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, China

【机构】 中国科学院物理研究所；

【摘要】 本文通过X射线粉末衍射和磁性测量研究了Fe部分替代Co对SmCo6.8-xFexHf0.2(x=0．1,0．3,0．5, 0．7)化合物的晶体结构和磁性能的影响。SmCo6.8-xFexHf0．2化合物结晶为具有P6／mmm空间群的TbCu7 型结构。晶格常数a和c随着Fe含量的增加而增大。SmCo6.8-xFexHf0．2化合物为铁磁性,并表现出很强的室温单轴磁晶各向异性。居里温度和饱和磁化强度都随着Fe含量的增加而增高。磁晶各向异性场在Fe含量x=0．5时达到最大值。结合各个晶位对磁晶各向异性的贡献和3d离子在不同晶位的择优占位,我们解释了磁晶各向异性场对成分的这种异常依赖关系。更多还原

【Abstract】 The effects of iron substitution on the crystal structure and magnetic properties of SmCo6.8-xFexHf0.2 (x=0.1, 0.3, 0.5, and 0.7) compounds were investigated by means of X-ray powder diffraction and magnetic measurements. As-cast SmCo6.8-xFexHf0.2 compounds crystallize in the TbCu7-type structure with the space group P6/mmm. The lattice parameters a and c increase with the Fe content. The SmCo6.8-xFexHf0.2 compounds exhibit ferromagnetic order with a strong room temperature uniaxial magnetocrystalline anisotropy. The Curie temperature and saturation magnetization increase with the Fe content. The magnetic anisotropy field of the compounds reaches a maximum value at x=0.5. The anomalous concentration dependence of the anisotropy field is explained by considering the contribution of individual site anisotropy in combination with the preferential occupation of 3d ions on different sites.更多还原