Experimental Studies of Surface and Interface Magnetism

9500213霍普斯特这个研究项目是对表面、超薄膜和界面的磁性的研究。重点是金属体系，包括过渡金属和稀土金属。用自旋极化电子能量损失谱研究了3d、4d和5d系列过渡金属的磁序和表面原子矩。用自旋极化二次电子发射显微镜研究了居里温度以下和高于体居里温度的Gd薄膜的磁畴结构。通过制备在反铁磁层之间包含薄铁磁层的多层材料来研究反铁磁性薄膜中的磁有序现象。这项研究的重点是基本的磁性问题，但其结果也将引起更广泛的兴趣，特别是在信息存储技术的背景下。这个研究项目研究磁性金属的超薄多层膜。多层膜的磁性行为取决于不同层的厚度和组成--这一点人们还不完全了解。实验方法包括研究磁电子与薄膜的相互作用。可以分析材料对磁性电子的散射，从而推断出有关薄膜磁性状态的重要信息。这些材料具有根本意义，并且在基于硬盘驱动器和相关设备的信息存储技术的背景下具有很大的技术相关性。***

9500213 Hopster This research project is an investigation of the magnetism of surfaces, ultrathin films, and interfaces. The focus is on metallic systems, including transition metals and rare earth metals. The magnetic order and the surface atomic moments of transition metals of the 3d, 4d, and 5d series will be studied by spin-polarized electron energy loss spectroscopy. The magnetic domain structure of gadolinium films below and above the bulk Curie temperature will be investigated by spin polarized secondary electron emission microscopy. Magnetic ordering phenomena in antiferromagnetic films will be studied by preparing multilayered materials which include thin ferromagnetic layers between the antiferromagnetic layers. The research is focused on fundamental magnetism issues, but the results will also be of much broader interest, particularly in the context of information storage technology. %%% This research project investigates ultrathin multilayers of magnetic metals. The magnetic behavior of the multilayers depends on the thickness and composition of the various layers--in ways that are incompletely understood. The experimental approach involves study of the interaction of magnetic electrons with the thin films. The scattering of the magnetic electrons by the materials can be analyzed to deduce important information about the magnetic state of the films. The materials are of fundamental interest, and have great technological relevance in the context of information storage technology based on hard drives, and related devices. ***