Studies of Artificially Structured Materials

9501195钱由多层膜和颗粒状固体组成的各种人工结构材料将通过多源溅射沉积和脉冲激光沉积来制备，并通过X射线衍射、透射电子显微镜等技术进行表征。超导/磁性多层膜旨在揭示新发现的现象和邻近效应。我们将研究颗粒和多层体系的巨磁输运特性，以捕捉复杂的物理现象。各种非传统磁性多层膜旨在探测层间耦合、非晶态成分层的作用以及金属-绝缘体系统的行为。这些都是当前感兴趣的问题，其中许多问题在高密度磁存储和磁阻读出设备中也具有技术重要性。这项建议侧重于由多层和颗粒状固体组成的各种人工结构材料，这些材料的层厚度或颗粒直径仅约为千亿分之一英寸。这些新材料通过先进的加工方法制造，展示了许多普通材料所不具备的新的和新颖的性能。特别令人感兴趣的是超导性质、巨磁电阻行为和磁层之间的耦合。这些性质在超导体在磁场、高密度磁存储和磁阻读出技术中的应用中具有重要意义。***

9501195 Chien A variety of artificially structured materials composed of multilayers and granular solids will be fabricated by multi-source sputter deposition and pulsed laser deposition, and characterized by x-ray diffraction, transmission electron microscopy, and other techniques. The superconducting/magnetic multilayers are designed to reveal newly found phenomena and proximity effects. The giant magneto-transport properties of granular and multilayer systems will be studied to capture the intricate physics. A variety of unconventional magnetic multilayers are intended to probe interlayer coupling, the role of amorphous constituent layers, and the behavior of metal-insulator systems. These are problems of current interest, many of them also have technological importance in high-density magnetic storage and magnetoresistive read-out devices. %%% This proposal focuses on a variety of artificially structured materials composed of multilayers and granular solids, where the layer thickness or the particle diameter is only about 100 billionths of an inch. These new materials, fabricated by advanced processing methods, exhibit a host of new and novel properties that are unavailable in ordinary materials. Of particular interest are the superconducting properties, the giant magnetoresistance behavior, and the coupling between magnetic layers. These properties have relevance in applications of superconductors in magnetic fields, high density magnetic storage, and magnetoresistive read-out technology. ***