Superlattices, Multilayers and Metastable Systems

采用分子束外延(MBE)和先进溅射技术制备各种超晶格、多层膜和亚稳态固体材料，并用X射线衍射仪、透射电子显微镜等微结构技术对其进行表征。在稀土超晶格中，将探索其磁性、定制的自旋结构和层间耦合。我们将研究周期和非周期超晶格。他们将研究Gd-Dy超晶格中共线和螺旋自旋结构的连接。铁基和钴基超晶格非常适合于研究磁性薄层的磁性以及由于磁层厚度、晶体取向和界面耦合而产生的效应。在多层膜系统中，将研究薄合金层的行为，包括晶态和非晶态，以及铁磁性或自旋玻璃。在超晶格和多层系统中，将研究磁表面各向异性，它与层厚度和晶体取向的关系，以及垂直表面各向异性的可能性。一些锰基和铁基亚稳合金系统也将被研究。

A variety of superlattices, multilayers and metastable solids will be fabricated by molecular beam epitaxy (MBE) and advanced sputtering, and characterized by x-ray diffraction, transmission electron microscopy and other microstructure techniques. In the rare earth superlattices, the magnetic properties, tailored spin structures and interlayer coupling will be explored. Periodic as well as aperiodic superlattices will be studied. They will investigate the linkage of collinear and helical spin structures in gadolinium-dysprosium superlattices. Iron and cobalt based superlattices are well suited for the investigation of the magnetic properties of thin magnetic layers and effects due to layer thickness, crystalline orientation and interfacial coupling. In multilayer systems, the behavior of thin alloy layers, both cryatalline and amorphous, and either ferromagnetic or spin glasss, will be studied. Magnetic surface anisotropy, its dependence on layer thickness and crystalline orientation, and the possibility of perpendicular surface anisotropy will be investigated in superlattice and multilayer systems. A number of manganese-based and iron-based metastasble alloy systems will also be studied.