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用电子束沉积法在加热到100℃的MgO(001)基板上生长了50nm厚的FexPt100-x取向薄膜,原子比成分范围为x=[10,85].在500℃进行保温2h的原位热处理后,分析样品的结构及沿面内和垂直于薄膜方向施加磁场的磁性行为.结果表明,随着x的增加,易磁化轴的方向在沿平行于膜面方向和垂直于膜面方向之间反复变化,取决于内秉的磁晶各向异性与外秉的形状各向异性之间的竞争.当x=60时,由于薄膜发生不完全的A1→L10相转变,形成了A1软磁相与L10硬磁相的复合体,样品沿平行和垂直于膜面方向磁化的矫顽力都达到5kOe(1Oe=79.5775Am-1)以上.沿膜面方向磁化时,矫顽力高于软磁相的磁晶各向异性场,并且正负向磁化的剩余磁化强度明显不相等.采用三磁畴软磁相模型,结合硬磁/软磁交换耦合作用,对此进行了解释.这种硬磁/软磁复合材料适合于用来制作磁力显微镜的各向同性高矫顽力探针.
A 50-nm-thick FexPt100-x-oriented film was grown by electron beam deposition on a MgO (001) substrate heated to 100 ° C with an atomic ratio composition of x = [10,85]. In situ at 500 ° C for 2h After heat treatment, the structure of the sample and the magnetic behavior of the magnetic field in the in-plane and in the perpendicular direction to the film were analyzed.The results show that with the increase of x, the easy-magnetization axis is in the direction parallel to the film plane and perpendicular to the film plane The repeated changes depend on the competition between the magnetocaloric anisotropy and the external shape anisotropy.When x = 60, the A1 soft magnetic phase is formed due to the incomplete A1 → L10 phase transformation of the film The coercive force of the composite magnetized along the direction parallel to and perpendicular to the film surface reached 5kOe (1Oe = 79.5775Am-1) or more when the composite was aligned with the L10 hard magnetic phase, and the coercive force was higher than that of the soft magnetic Phase magnetocrystalline anisotropy field, and the residual magnetization of the positive and negative magnetization is obviously unequal.This is explained by using the three-domain soft magnetic phase model in combination with the hard magnetic / soft magnetic exchange coupling action Magnetic / soft magnetic composites are suitable for use with isotropic high coercivity probes for making magnetic microscopes.