Investigation of Transition Metal Impurities by Weak Localization and the Anomalous Hall Effect

通过弱局域化和反常霍尔效应研究过渡金属杂质

• 批准号: 9509875
• 负责人: Gerd Bergmann
• 金额: $ 38万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-12-01 至 1999-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9509875&HistoricalAwards=false
• 关键词: Investigation; Transition; Metal; Impurities; Weak

9509875 Bergmann This project is concerned with the magnetic properties of nd- atoms on the surface of noble metals or simple (s,p) metals. The complementary transport methods of weak localization and the anomalous Hall effect are employed. These methods detect the magnetic interaction between the magnetic impurity atoms and bulk/surface conduction electrons. The weak localization technique allows the detection of less that 10-4 of a monolayer of surface atoms, and is by a factor of 100 more sensitive than alternative detection methods. The anomalous Hall effect measurements help to determine the character of the magnetic atom, ferromagnetic or antiferromagnetic. This project addresses both experimental and theoretical aspects of the coupling between magnetic impurity atoms and conduction electrons. Sub-monolayers of 3d atoms, as well as 4d and 5d atoms such as zirconium, molybdenum, technetium, and ruthenium on metals such as silver and gold will be investigated. The results are of fundamental interest, but also have potential applications to technological areas such as the microelectronics industry. %%% The study of magnetism in thin films and on surfaces belongs to a very active area of materials research with numerous opportunities to have an impact on technology such as magnetic recording devises. Individual magnetic atoms form the simplest building blocks on magnetic structure. Such atoms will be investigated in this study using very sensitive techniques. On of these can detect less than one ten-thousandth of a single layer of magnetic atoms which are deposited on a metallic surface another technique is able to distinguish the direction of the individual magnetic moments of the deposited atoms. The experiments also probe to what extent the magnetic properties of surfaces differ from those of the bulk. ***

9509875伯格曼这个项目涉及贵金属或简单金属(S，p)表面的Nd原子的磁性。采用弱局域和反常霍尔效应的互补输运方法。这些方法检测磁性杂质原子与体/表面传导电子之间的磁相互作用。弱局域化技术允许检测到不到10-4的单分子层表面原子，并且比其他检测方法灵敏100倍。反常霍尔效应的测量有助于确定磁性原子的性质，是铁磁的还是反铁磁的。这个项目涉及磁性杂质原子和传导电子之间的耦合的实验和理论两个方面。将研究3d原子以及4d和5d原子在银和金等金属上的亚单分子膜。这些结果不仅具有根本意义，而且在微电子工业等技术领域也具有潜在的应用价值。薄膜和表面磁性的研究属于材料研究的一个非常活跃的领域，有许多机会对磁记录设备等技术产生影响。单个磁性原子构成了磁性结构上最简单的构件。这种原子将在这项研究中使用非常敏感的技术进行研究。在这些技术中，可以探测到沉积在金属表面上的单层磁性原子的不到万分之一，另一种技术是能够区分沉积原子的单个磁矩的方向。这些实验还探索了表面的磁性与本体的磁性有多大的不同。***