Magnetic Hysteresis in Granular and Exchange-Coupled Thin Films

[307676] Hadjipanayis这个项目涉及颗粒状固体和交换偶联磁性金属多层材料的合成和表征。磁性能与洛伦兹显微镜观察到的微观结构和磁畴结构有关。磁性研究包括矫顽力与磁场和温度的关系、剩磁曲线、各向异性测量和磁后效。通过考察样品制备、不同基体材料、薄膜微观结构和颗粒相互作用对铁和钴颗粒固体磁性能的影响，系统地研究了铁和钴颗粒固体的磁性能。铁/氧化铁和钴/氧化钴薄膜也将进行类似的研究。该研究包括材料微磁行为的建模研究。这个项目将支持生产新型磁性材料的研究。有些材料是由小的磁性颗粒组成的。另一些是铁和钴、离子和钴氧化物的薄膜。这些材料是基本的兴趣，但在磁记录材料领域也有很大的技术兴趣。磁体的复杂材料性质将通过各种技术，电子显微镜来表征。此外，将对材料的性质进行建模，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. ***