为了研究铁电相BiFeO3对复合薄膜磁性能的影响,在LaNiO3 (LNO)缓冲层的Si(100)衬底上旋涂制备了含有0、6、9、10层等不同厚度BiFeO3的层状CoFe2O4-BiFeO3 (CFO-BFO)多铁复合薄膜.采用XRD、SEM以及TEM对其结构和形貌进行了表征,采用振动样品磁强计测量磁性,研究了不同厚度BFO对复合薄膜磁性的影响.结果表明:CFO和BFO在异质结构薄膜中共存.缓冲层LNO和铁磁相CFO薄膜具有精细微观结构及明显界面.铁电相BFO的厚度对CFO-BFO复合薄膜的磁性能产生了很大影响.在含有不同层数铁电相BFO的复合薄膜中,含有9层BFO复合薄膜的饱和磁化强度最大,达到了230 emu·cm-3,相比无铁电相BFO的薄膜,饱和磁化强度提高了18.6％.初步讨论认为:随着铁电相BFO厚度的增加,CFO与BFO之间的应力传导引起了复合薄膜饱和磁化强度的提高.
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