磁控溅射制备BiFeO3/Sr1-xLaxFe12-xCoxO19复合薄膜及其磁性能研究

The Preparation and Magnetic Properties of BiFeO3/Sr1-xLaxFe12-xCoxO19 Composite Films by Magnetron Sputtering

摘要:

摘 要: 室温下采用射频磁控溅射法，在P型<100>Si基衬底上分别制备了BiFeO3(BFO)和Sr1-xLaxFe12-xCoxO19（x=0~0.3）的单层及2-2型BiFeO3/Sr1-xLaxFe12-xCoxO19叠层式复合结构薄膜。采用X射线衍射（XRD）、扫描电子显微镜（SEM）和材料综合物性测试系统（PPMS）对薄膜样品的微观结构、表面形貌以及磁学性能进行了测试分析。结果表明，随着x的增加，Sr1-xLaxFe12-xCoxO19单层膜的矫顽力先少量减小后增加，剩磁比起初不变然后递增，而剩余磁化强度一直减小。当x=0.3时，其矫顽力和剩磁比均达到最大值，分别为6165Oe和0.69，而剩余磁化强度达到最小值为50emu/cm3；复合薄膜的矫顽力及剩磁比先增加后减小，剩余磁化强度一直减小，在x=0.2矫顽力和剩磁比均达到最大值，分别为5333Oe和0.73，当x=0.3时矫顽力和剩磁比明显减弱，分别为2151Oe和0.4，此时剩余磁化强度为最小值19emu/cm3。

Abstract:

Abstract: BiFeO3(BFO) and Sr1-xLaxFe12-xCoxO19（x=0~0.3）monolayer films and 2-2 BiFeO3 / Sr1-xLaxFe12-xCoxO19 stacked composite films were prepared on the P-type <100> Si-based substrates by magnetron sputtering at room temperature. The microstructure, surface morphology and magnetic properties of thin film samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and material properties of a comprehensive test system (PPMS).The results indicate that with the increase of x, the coercive force of Sr1-xLaxFe12-xCoxO19 monolayer first increase after small decreases, residual magnetism ratio unchanged at first and then increase, while the residual magnetization have been reduced. When the x = 0.3 the coercive force and the residual magnetism ratio reached a maximum value of 6165Oe and 0.69, and the residual magnetization reaches the minimum value of 50emu/cm3; The coercive force and residual magnetism ratio of the composite film decreases after the first increases, while the residual magnetization have been reduced. At x = 0.2 the coercive force and residual magnetism ratio reached a maximum value of 5333Oe and 0.73. When the x = 0.3 when the ratio of the coercive force and the residual magnetism ratio decreased significantly as 2151Oe and 0.4, the residual magnetization in this case is the minimum value of 19 emu/cm3.