Magnetic Hysteresis in Granular and Exchange-Coupled Thin Films

9307676 Hadjipanayis该项目涉及颗粒状固体和交换耦合磁性金属多层膜的合成和表征。 磁性能将与洛伦兹显微镜观察到的微观结构和磁畴结构相关。 磁性研究包括磁场和温度对磁化率的依赖性、剩磁曲线、各向异性测量和磁后效。 通过研究样品制备、不同基体材料、薄膜微观结构和颗粒相互作用的影响，系统地研究了铁和钴颗粒固体的磁性。 将对铁/氧化铁和钴/钴氧化物薄膜进行类似的研究。 该研究包括材料的微磁行为的建模研究。 该项目将支持生产新型磁性材料的研究。 有些材料由小的磁性颗粒组成。 其他的是铁、钴、离子和钴氧化物的薄膜。 这些材料具有根本意义，但在磁记录材料领域也具有巨大的技术意义。 磁体的复杂材料特性将通过各种技术、电子显微镜来表征。 此外，材料的属性将被建模，以帮助解释所观察到的现象。 ***

9307676 Hadjipanayis This project deals with the synthesis and characterization of granular solids and exchange-coupled magnetic metal multilayers. The magnetic properties will be correlated with the microstructure and the magnetic domain structure observed by Lorentz microscopy. The magnetic studies include field and temperature dependence of coercivity, remanence curves, anisotropy measurements, and magnetic after effects. The magnetic properties of iron and cobalt granular solids will be studied systematically by investigating the effects of sample preparation, different matrix material, film microstructure and particle interactions. Similar Studies will be made on iron/iron oxide and cobalt/coblat oxide films. The research includes modeling studies of the micromagnetic behavior of the materials. %%% This project will support research that will produce new types of magnetic materials. Some of the materials consist of small magnetic particles. Others are thin films of iron and cobalt and ion and cobalt oxides. The materials are of fundamental interest, but are of great technological interest also in the area of magnetic recording materials. The complex materials properties of the magnets will be characterized by a variety of techniques, electron microscopy. In addition, the properties of the materials will be modeled as an aid in the interpretation of the observed phenomena. ***