论文部分内容阅读
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230emu·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。
In order to study the influence of ferroelectric BiFeO3 on the magnetic properties of the composite films, layered CoFe2O4 with different thicknesses of BiFeO3 such as 0, 6, 9, 10 layers was prepared on Si (100) substrate of LaNiO3 (LNO) -BiFeO3 (CFO-BFO) iron-iron composite film. The structure and morphology of the films were characterized by XRD, SEM and TEM. The magnetism was measured by vibrating sample magnetometer. The effects of different thicknesses of BFO on the magnetic properties of the films were investigated. The results show that CFO and BFO coexist in heterostructured films. The buffer layer LNO and ferromagnetic phase CFO films have a fine microstructure and a clear interface. The thickness of ferroelectric BFO has a great influence on the magnetic properties of CFO-BFO composite films. In the composite films containing different layers of ferroelectric BFO, the saturation magnetization of the 9-layer BFO composite films reaches 230emu · cm-3, and the saturation magnetization increases by 18.6 compared with the films without ferroelectric BFO %. The preliminary discussion shows that as the thickness of ferroelectric phase BFO increases, the stress conduction between CFO and BFO leads to the increase of saturation magnetization of the composite film.