Surface Magnetism of Novel Epitaxial Magnetic Systems

新型外延磁系统的表面磁性

• 批准号: 8716043
• 负责人: Carl Rau
• 金额: --
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-02-15 至 1993-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8716043&HistoricalAwards=false
• 关键词: Surface; Magnetism; Novel; Epitaxial; Magnetic

The aim of their program is to carefully prepare, characterize and investigate novel magnetic materials and epitaxial, ultra- thin (1-20 atomic layers) films which are expected to exhibit unusual magnetic properties such as super-ferromagnetism, altered Curie temperatures and altered critical exponents that contrast strikingly with bulk behavior. They will use electron capture spectroscopy (ECS), which has developed into a very sensitive spin-sensitive method, to probe the long-ranged and short-ranged magnetic order at the topmost layer of a surface. Further magnetic studies will be performed using the magneto-optic Kerr effect and ion-induced emission of polarized secondary electrons. The latter is a new, very surface sensitive technique that is being designed in their lab. They also plan to advance their magnetic microscope towards atomic resolution. The materials studied will include artificial magnetic systems composed of elements such as iron, chromium, manganese, palladium and terbium that exhibit unusual electric and magnetic properties if deposited on adequate substrates. Their program includes spin glasses, Heusler alloys and rare-earth/transition metal heterostructures.

他们计划的目的是仔细制备，表征和研究新型磁性材料和外延，超薄（1-20原子层）薄膜，这些薄膜有望表现出不同寻常的磁性，如超铁磁性，改变的居里温度和改变的临界指数，与体行为形成鲜明对比。他们将使用电子捕获光谱（ECS），它已经发展成为一种非常灵敏的自旋敏感方法，来探测表面最上层的长程和短程磁秩序。进一步的磁性研究将利用磁光克尔效应和离子诱导的极化二次电子发射进行。后者是一种新的，非常表面敏感的技术，正在他们的实验室设计。他们还计划将他们的磁性显微镜提高到原子分辨率。研究的材料将包括由铁、铬、锰、钯和铽等元素组成的人工磁性系统，如果沉积在适当的衬底上，这些元素会表现出不同寻常的电和磁性。他们的项目包括自旋玻璃、赫斯勒合金和稀土/过渡金属异质结构。