摘要
采用化学溶液沉积法(CSD)在Au/Ti/SiO2/Si衬底上通过自组装生长制备了BiFeO3-NiFe2O4(BFO-NFO)多铁性复合薄膜.X射线衍射图谱(XRD)显示形成了分离的钙钛矿结构的铁电相BFO和尖晶石结构的铁磁相NFO.NFO的引入导致复合薄膜的泄漏电流减小,剩余极化强度增加.相比于纯BFO薄膜,0.25NFO-0.75BFO样品泄漏电流下降了约两个数量级,剩余极化强度(Mr)和饱和磁化强度(Ms)都达到最大值,分别为2.3μC/cm2和70.2kA·m-1.通过计算NFO的铁磁贡献,推测BFO-NFO复合薄膜中可能存在着磁电耦合.
Multiferroic xNFO-（1-x）BFO（x =0.00 0.10,0.15,0.20,0.25） composite films are prepared through self-assembling growth on Au/Ti/SiO2/Si substrates by chemical solution deposition（CSD）.X-ray diffraction analysis shows that the perovskite BiFeO3 and the spinel structured NiFe2O4 phases are formed and separated.The leakage current density（J） in the film decreases and the remnant polarizations（Mr） increases with the introduction of NFO.The value of J in 0.25NFO—0.75BFO film is found to be nearly two orders of magnitude lower than that in the BFO film,and the Mr and the saturation magnetization（Ms） reach maxima,i.e.2.3μC/cm2 and 70.2 kA·m-1,respectively.Therefore,from the calculation for magnetic moment of NFO we can conjecture that magnetoelectric coupling exists in the composite films.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第6期691-696,共6页
Acta Physica Sinica
基金
河北省自然科学基金(批准号:A2009000254)
河北民族师范学院博士基金(批准号:201003)
河北师范大学博士基金(批准号:L2006B10)资助的课题~~
关键词
多铁性复合薄膜
磁电耦合
铁电性
铁磁性
multiferroic composite films
magnetoelectric coupling
ferroelectric properties
magnetic properties
