Studies of Artificially Structured Materials

[9501195] Chien将通过多源溅射沉积和脉冲激光沉积制备多种由多层和粒状固体组成的人工结构材料，并通过x射线衍射、透射电镜等技术对其进行表征。设计超导/磁性多层材料是为了揭示新发现的现象和邻近效应。将研究颗粒和多层体系的巨磁输运性质，以捕捉复杂的物理现象。各种非传统的磁性多层材料旨在探索层间耦合，非晶组成层的作用，以及金属-绝缘体系统的行为。这些都是当前人们感兴趣的问题，其中许多问题在高密度磁存储和磁阻读出器件中也具有技术重要性。这一提议的重点是由多层和颗粒状固体组成的各种人工结构材料，其中层厚度或颗粒直径仅为约1000亿分之一英寸。这些新材料通过先进的加工方法制造，表现出许多普通材料所不具备的新特性。特别感兴趣的是超导性质，巨磁电阻行为，以及磁层之间的耦合。这些特性与超导体在磁场、高密度磁存储和磁阻读出技术中的应用有关。＊＊＊

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. ***