Studies of Unusual Ferromagnetic Materials

异常铁磁材料的研究

• 批准号: 0101318
• 负责人: Peter Schiffer
• 金额: $ 29.27万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-06-01 至 2005-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0101318&HistoricalAwards=false
• 关键词: Studies; Unusual; Ferromagnetic; Materials

This individual investigator research project includes two research thrusts related to the properties of unusual ferromagnetic materials in which the magnetic and electronic properties are strongly coupled. The first research thrust will be an investigation of phenomena related to phase separation in the "colossal magnetoresistance" perovskite manganites. Recent experimental and theoretical work has indicated that intrinsic magnetoelectronic phase separation is an important element of the physics of these materials, and the research will investigate resultant novel phenomena. The second research thrust will be an investigation of the transport and magnetic properties of thin films of ferromagnetic (Ga,Mn)As and MnAs. The basic physics of these materials (which are semiconducting and metallic, respectively) will be probed through magnetic and magnetotransport studies of the pure materials and heterostructures incorporating these ferromagnets with other magnetic and non-magnetic materials. The educational component of the project will involve the dissertation work of at least one graduate student and the active participation of undergraduates in the laboratory. These students will acquire knowledge and skills that will be use in future careers whether in academia, industrial, or government laboratories. %%%This individual investigator project centers on two different research thrusts related to the properties of unusual magnetic materials which are ferromagnetic, i.e. displaying a macroscopic magnetic moment. The specific materials studied are of particular interest because their magnetism is strongly connected to their electronic properties, and advances in the fundamental understanding of this coupling could potentially contribute to "spintronic" technological applications which exploit a combination of magnetic and electronic properties. The first research thrust will be an investigation of phenomena related to the coexistence of two different types of magnetic and electronic phases within a class of compounds known as the "colossal magnetoresistance" perovskite manganites. The second research thrust will be an investigation of the transport and magnetic properties of thin films of ferromagnetic (Ga,Mn)As and MnAs which both can be grown epitaxially on the commonly used semiconductor GaAs and thus may have more immediate technological importance. The educational component of the proposed research will involve the dissertation work of at least one graduate student and the active participation of undergraduates in the laboratory. The training that these students obtain will be valuable for future careers in industry, government, or academia.***

该单独的研究者研究项目包括与不寻常的铁磁材料的性质有关的两个研究推力，其中磁性和电子特性密切相关。 第一个研究的推力将是对与“巨大磁耐磁力”钙钛矿锰米粉中相关的现象的研究。最近的实验和理论工作表明，内在的磁性相分离是这些材料物理学的重要元素，研究将研究结果的新现象。第二项研究推力将是对铁磁薄膜（GA，MN）AS和MNA的薄膜的运输和磁性的研究。 这些材料的基本物理（分别是半导体和金属）将通过对纯材料和磁性材料和异质结构的磁性和磁转运研究进行探测，并将这些铁磁体与其他磁性和非磁性材料结合在一起。 该项目的教育部分将涉及至少一名研究生的论文工作以及本科生在实验室的积极参与。 这些学生将获得未来职业的知识和技能，无论是在学术界，工业或政府实验室中。 %% %%该单个研究者项目集中于与非同寻常的磁性材料的性质相关的两个不同的研究推力，这些磁性材料具有铁磁材料，即显示宏观磁矩。 所研究的特定材料特别令人感兴趣，因为它们的磁性与它们的电子特性密切相关，并且对这种耦合的基本理解的进步可能有助于促进“自旋”技术应用，从而利用磁性和电子特性的结合。第一项研究的推力将是对与称为“巨大磁耐耐药”钙钛矿锰的两种化合物中两种不同类型的磁性和电子相之间存在有关的现象的研究。 第二项研究的推力将是对铁磁（GA，MN）AS和MNA的薄膜的运输和磁性的研究，这两者都可以在常用的半导体GAAS上表现出现，因此可能具有更直接的技术重要性。 拟议的研究的教育部分将涉及至少一名研究生的论文工作以及本科生在实验室的积极参与。 这些学生获得的培训对于行业，政府或学术界的未来职业都很有价值。***