Dy^(3+)掺杂BiFeO_3薄膜的晶格转变和磁性能研究(英文)  

Lattice Transition and Magnetic Property of Dy^(3+)-Doped BiFeO_3 Film Prepared by Chemical Solution Method

作　　者：刘珊[1] 李剑[1] 潘伟[1] 

机构地区：[1]清华大学新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《稀有金属材料与工程》2009年第A02期653-655,共3页Rare Metal Materials and Engineering

摘　　要：以硝酸铋、硝酸铁以及硝酸镝等无机硝酸盐为原料通过化学液相法在Pt(111)/Ti/SiO2/Si上制备了Dy3+掺杂的BiFeO3薄膜,研究了Dy3+掺杂量的变化对Bi1-xDyxFeO3薄膜的晶体结构和磁性的影响。Dy3+掺杂量不高于10%的Bi1-xDyxFeO3薄膜可以得到与纯BiFeO3相同的晶体结构。随着Dy3+掺杂量的进一步增大,Bi1-xDyxFeO3薄膜的晶体结构发生变化,晶格从菱心结构转变为单斜或四方结构。磁性测试显示:随着Dy3+掺杂量的增加Bi1-xDyxFeO3薄膜的磁性增强,同时从无饱和磁化强度和零磁滞的S型磁化曲线的形状判断,薄膜由于铁磁反铁磁转变时两磁性相竞争表现出自旋玻璃态的特征。The influence of Dy doping on crystal structure and the magnetic properties of BiFeO3 films prepared by chemical solution deposition were investigated. A pure rhombohedral BiFeO3 crystalline phase was obtained in the films with the Dy content x=0.05 and 0.10. The X-ray diffraction （XRD） results showed the transition of crystal symmetry. The crystal structure may be distorted from rhombohedral structure to monoclinic or tetragonal structure with Dy doping. The room-temperature magnetic curves of Dy^3＋-doped BiFeO3 films exhibited the characteristics of no remanet magnetization and zero coereivity, which may be induced by the nano-sized grains or the random competition of ferromagnetic and antiferromagnetic effects. The saturated magnetization under magnetic field of 8 - 105 A/m had increased from 6 emu/cm^3 in BiFeO3 film to 17.5 emu/cm^3 in Bi0.9Dy0.1FeO3 film due to the suppression of the spin structure of BiFeO3 crystal by Dy doping.

关 键 词：稀土离子掺杂 BIFEO3薄膜 磁性 化学液相法 

分 类 号：O484.43[理学—固体物理]