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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BiFeO_3(BFO)和Sr_(1-x)La_xFe_(12-x)Co_xO_(19)(x=0~0.3)的单层及2-2型BiFeO_3/Sr_(1-x)La_xFe_(12-x)Co_xO_(19)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,Sr_(1-x)La_xFe_(12-x)Co_xO_(19)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491 kA/m和0.69,而剩余磁化强度达到最小值为50(A·m~2)/kg;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425 kA/m和0.73,当x=0.3时矫顽力和剩磁比明显减弱,分别为171 kA/m和0.4,此时剩余磁化强度为最小值19(A·m~2)/kg。
BiFeO_3 (BFO) and Sr_ (1-x) La_xFe_ (12-x) Co_xO_ (19) were prepared by RF magnetron sputtering at room temperature on a P-type <100> 0.3) and 2-2 type BiFeO_3 / Sr_ (1-x) La_xFe_ (12-x) Co_xO_ (19) laminated composite films. The microstructure, surface morphology and magnetic properties of the films were tested by XRD, SEM and PPMS. The results show that with the increase of x, the coercive force of Sr 1-x La x Fe 12-x Co x O 19 monolayer decreases first and then increases, Magnetization has been reduced. When x = 0.3, the coercive force and remanence ratio reached the maximum values of 491 kA / m and 0.69, respectively, while the remanent magnetization reached the minimum of 50 (A · m ~ 2) / kg. The coercivity and residual remanence firstly increased and then decreased, and the remanent magnetization decreased all the time. The coercivity and residual remanence reached the maximum at x = 0.2, which were 425 kA / m and 0.73, respectively. When x = 0.3 The coercivity and remanence ratio were significantly weakened to 171 kA / m and 0.4, respectively. The remanent magnetization was 19 (A · m ~ 2) / kg at this time.