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利用磁控溅射方法在100℃的MgO单晶基片上制备了[FePt/Au]10多层膜,并研究了采用FePt/Au多层膜结构对FePt薄膜的有序化温度、矫顽力(HC)、垂直磁各向异性、晶粒尺寸以及颗粒间磁交换耦合作用的影响.磁性测试结果表明:FePt/Au多层膜在退火后具有较高的HC、良好的垂直磁各向异性、较小的晶粒尺寸且无磁交换耦合作用.截面高分辨电镜分析表明:Au可以缓解MgO和FePt之间较大的晶格错配,从而促进薄膜的垂直磁各向异性;同时,采用FePt/Au多层膜结构增加了FePt/Au界面能、应力能以及Au原子在薄膜中的扩散作用,促进了薄膜的有序化,从而有效降低了有序化温度,并且大幅度提高其HC.此外,Au原子部分扩散到FePt相的边界处,起到抑制FePt晶粒生长、隔离FePt颗粒的作用,从而显著降低了FePt晶粒的尺寸和颗粒间磁交换耦合作用.
The [FePt / Au] 10 multilayers were prepared by magnetron sputtering on a MgO single crystal substrate at 100 ℃. The effects of FePt / Au multilayers on ordering temperature, coercivity (HC), the perpendicular magnetic anisotropy, the grain size and the magnetic exchange coupling between the particles.The magnetic test results show that the FePt / Au multilayers have higher HC after annealing, good perpendicular magnetic anisotropy , Smaller grain size and no magnetic exchange coupling effect.High-resolution electron microscopy analysis showed that: Au can ease the larger lattice mismatch between MgO and FePt, thereby promoting the film perpendicular magnetic anisotropy; the same time, using The FePt / Au multilayer structure increases the interfacial energy and stress energy of FePt / Au and the diffusion of Au atoms in the thin film, and promotes the ordering of the thin films, thus effectively reducing the ordering temperature and greatly increasing the HC In addition, part of Au atoms diffused to the boundary of FePt phase, which could inhibit the growth of FePt grains and isolate FePt grains, thus significantly reducing the size of FePt grains and the magnetic exchange coupling between grains.