Neutron Scattering Studies of Magnetic Semiconductor Thin Films and Nanostructures

磁性半导体薄膜和纳米结构的中子散射研究

• 批准号: 9803218
• 负责人: Jacek Furdyna
• 金额: $ 25.5万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-01 至 2002-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9803218&HistoricalAwards=false
• 关键词: Neutron; Scattering; Studies; Magnetic; Semiconductor

9803218 Furdyna This renewal proposal by Profs. J. Furdyna (University of Notre Dame), J.J. Rhyne (University of Missouri/Columbia), with Prof. C.M. Sorensen (Kansas State University) as a sub-contractor describes research using neutron scattering experiments to study semiconductor thin films and nanostructures in order to gain an understanding of magnetic ordering and magnetic interactions in such systems. The proposed research is composed of three interrelated areas: the identification of mechanisms which determine interlayer coupling in MnSe- and MnTe-based superlattices, systematic investigations to enable distinguishing between the effects of strain and those of dilution on the antiferromagnetic transitions in Mn(1-x)IIxIV alloys, and a new exploratory investigation of spin ordering and exchange interactions in magnetic semiconductor nano-particles. Specific thin film systems are MnTe/Zn(1-x)MnxTe superlattices and Mn(1- x)MgxTe with varying doping values of x. Also to be studied are the magnetic properties of Mn nanocrystals. %%% The objective of this research is to apply neutron scattering techniques to magnetic semiconductor thin films and nanostructures in order to gain understanding of magnetic ordering and magnetic interactions in these systems. Magnetic semiconductors are of great fundamental interest in magnetism, because their manganese sublattices constitute frustrated Heisenberg antiferromagnets governed by short-range interactions. Three areas of investigation are proposed. First, magnetic/non-magnetic superlattices , such as manganese-tellurium/zinc-tellurium will be studied in order to elucidate the mechanisms responsible for the coupling between magnetic layers for magnetic interactions. In the second part the investigators will exploit newly developed techniques for growing materials composed of group II and group VI elements (II-VI all oys), specifically with the group IIa elements magnesium and berillium, in order to elucidate the effect of dilution and strain on the antiferromagnetic transition in diluted magnetic alloys. In the third part an exploratory pilot program will be started that focuses on neutron scattering in II-VI-based nanoparticles containing high concentrations of manganese. These studies will be performed in a collaboration between the principal investigator Prof. Furdyna (University of Notre Dame), the co-principal investigator Prof. J.J. Rhyne (University of Missouri - Columbia), and the sub-contractor Prof. C.M. Sorensen of the Kansas State University. The researches promise to contribute greatly to the understanding of magnetic interactions and thereby assist in the development of new and improved practical devices. ***

9803218 Furdyna教授的这一更新提案。J. Furdyna（圣母大学），J. J. Rhyne（密苏里州/哥伦比亚大学），与 C.M.教授Sorensen（堪萨斯州立大学）作为分包商描述了使用中子散射实验的研究 到 研究半导体 薄 膜 和纳米结构，以获得在这样的系统中的磁有序和磁相互作用的理解。 拟议的研究由三个相互关联的领域组成：确定MnSe-和MnTe-基超晶格中决定层间耦合的机制，系统的研究以区分Mn（1-x）IIxIV合金中应变和稀释对反铁磁转变的影响，以及磁性半导体纳米粒子中自旋有序和交换相互作用的新探索。 具体的薄膜系统是MnTe/Zn（1-x）MnxTe 超晶格和 Mn（1- x）MgxTe，具有变化的x掺杂值。 还将研究Mn纳米晶体的磁性。 %%% 本研究的目的是应用 中子散射技术的磁性半导体薄膜和纳米结构，以获得了解 磁 有序和磁相互作用 这些系统。 磁性半导体在磁学中具有重要的基础意义，因为它们的锰亚晶格构成了受短程相互作用控制的受抑海森堡反铁磁体。 提出了三个调查领域。首先，将研究磁性/非磁性超晶格，例如锰碲/锌碲，以阐明负责磁性相互作用的磁性层之间的耦合的机制。 在第二部分中，研究人员将利用新开发的技术来种植由第II族和第VI族元素（II-VI全油）组成的材料，特别是与IIa族元素镁和铍，以阐明稀释和应变的影响。 对 稀磁合金中的反铁磁转变。 在第三部分，将启动一项探索性试点计划， 重点 对 中子散射 在 含有高浓度锰的II-VI基纳米颗粒。 这些研究将由主要研究者Furdyna教授（圣母大学）、共同主要研究者J. J. Rhyne教授（密苏里州-哥伦比亚大学）和分包商C.M.教授合作进行。 堪萨斯州立大学的索伦森。 的研究 承诺 到 贡献 大大 到 理解磁相互作用，从而帮助开发新的和改进的实用设备。 ***