物理学报Issue(3)：501-506,6.DOI:10.7498/aps.64.037501
稀土掺杂对钴铁氧体电子结构和磁性能影响的理论研究∗
Theoretical study on the influence of rare earth doping on the electronic structure and magnetic prop erties of cobalt ferrite
摘要
Abstract
Spinel ferrite is one of the very important magnetic materials, having the unique physical properties, chemical properties, magnetic properties, and electronic properties. CoFe2O4 is widely used due to their good electromagnetic properties. We have studied the electronic structure and magnetic properties of CoRE0.125Fe1.875O4 (RE = Nd, Eu, Gd)by first-principles plane-wave pseudopotential method based on density functional theory (DFT), combined with the generalized gradient approximation (GGA+U ) in this paper. Results show that the lattice constants of the compunds CoFe1.875RE0.125O4 (RE=Nd, Eu and Gd) will decrease due to the decreasing ionic radius of RE as the atomic number increases. Their magnetic properties depend on the unpaired 4f electrons of RE3+ ions, and the net magnetic moment of CoFe2O4 will increase with Eu and Gd doping, mainly because there are more unpaired 4f electrons in Eu3+ and Gd3+. Thus the doping of Eu3+ and Gd3+ may have a greater impact on the magnetic properties of cobalt ferrite. The contribution from the doping of Nd is not remarkable on the magnetic properties, since the Nd3+ ion, having a larger ionic radius, could distort the crystal structure of CoFe2O4.关键词
尖晶石型钴铁氧体/第一性原理/电子结构/磁性能Key words
spinel cobalt ferrite/first-principles/electronic structure/magnetic properties引用本文复制引用
侯育花,黄有林,刘仲武,曾德长..稀土掺杂对钴铁氧体电子结构和磁性能影响的理论研究∗[J].物理学报,2015,(3):501-506,6.基金项目
国家自然科学基金(批准号:11304146,51401103)和江西省教育厅基金(批准号：GJJ13484)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant Nos.11304146,51401103), and the Department of Education Foundation of Jiangxi Province, China (Grant No. GJJ13484) （批准号:11304146,51401103）
