Magnetic Behavior and Phase Transitions of Selected Pure, Dilute and Mixed Magnets
选定的纯磁体、稀磁体和混合磁体的磁行为和相变
基本信息
- 批准号:0085662
- 负责人:
- 金额:$ 20.04万
- 依托单位:
- 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:2001-02-01 至 2005-01-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The detailed magnetic behavior, especially that associated with magnetic phase transitions, of various pure, dilute and mixed magnetic systems with short-range exchange interactions will be examined. The pure materials are interesting because: some are members of a new transition metal series certain members of which exhibit nonequilibrium behavior, one is ferromagnetic and a potential member of a rare universality class; and others show signs of very large zero-field splittings. The study of spin glass behavior in insulators is of particular importance, and several of the proposed mixed magnets could exhibit such behavior in insulators is of particular importance, and several of the proposed mixed magnets could exhibit such behavior. One of these is a potential new type of spin glass which may occur on diluting a previously studied ferromagnet of novel type. Even apart from spin glass formation, the behavior of a ferromagnet of this kind with dilution is an important problem. Two of the mixed systems are ternary in character, that is they contain more than two components. Such systems are virtually unstudied among insulating materials. The mixed magnets will contain either competing exchange interactions, competing anisotropies, different spin values, or some combination of these. Determination of magnetic phase diagrams, showing the dependence of ordering temperature on composition and regions of phase stability, is a major objective of this work. Some theoretically predicted phase diagram types are yet to be observed. Very high field magnetization data will also be obtained for several systems, both pure and mixed; this will yield new information on critical fields in the materials and on zero-field splittings.%%%The chemical compounds to be examined included novel monohydrates of simple transition metal salts that exhibit certain novel structural or magnetic features. Studies of these systems will further such materials science goals as elucidation structure-property relationships and developing materials with new properties. A major impact will be the opportunities afforded undergraduate science students to gain experience with frontier research topics in a field of high priority to industry.
详细的磁性行为,特别是与磁相变,各种纯,稀和混合磁性系统与短程交换相互作用将被检查。 这些纯材料之所以有趣,是因为:有些是新的过渡金属系列的成员,其中某些成员表现出非平衡行为,一种是铁磁性的,是一种罕见的普适性类的潜在成员;而另一些则表现出非常大的零场分裂的迹象。 绝缘体中自旋玻璃行为的研究是特别重要的,并且所提出的几种混合磁体可以在绝缘体中表现出这种行为是特别重要的,并且所提出的几种混合磁体可以表现出这种行为。 其中之一是一种潜在的新型自旋玻璃,它可能发生在稀释以前研究的新型铁磁体上。 即使不考虑自旋玻璃的形成,这种铁磁体在稀释时的行为也是一个重要的问题。 其中两个混合体系具有三元性质,即它们含有两个以上的组分。 在绝缘材料中,这种系统实际上是未经研究的。 混合磁体将包含竞争交换相互作用、竞争各向异性、不同自旋值或这些的某种组合。 磁相图的测定,显示有序化温度对组成和相稳定区域的依赖性,是这项工作的一个主要目标。 一些理论上预测的相图类型尚未观察到。 还将获得几个系统(纯系统和混合系统)的非常高场磁化数据;这将产生有关材料中临界场和零场分裂的新信息。%待检测的化合物包括简单过渡金属盐的新型一水合物,其表现出某些新的结构或磁性特征。 对这些体系的研究将进一步推动材料科学的目标,如阐明结构-性能关系和开发具有新性能的材料。 一个主要的影响将是提供本科理科学生获得经验的前沿研究课题在一个高度优先的行业领域的机会。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Gary DeFotis其他文献
Gary DeFotis的其他文献
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{{ truncateString('Gary DeFotis', 18)}}的其他基金
Magnetism and Phase Transitions of Unusual Pure, Dilute and Mixed Magnets
不寻常的纯磁体、稀磁体和混合磁体的磁性和相变
- 批准号:
9527357 - 财政年份:1996
- 资助金额:
$ 20.04万 - 项目类别:
Continuing Grant
RUI: Magnetic Phase Transitions in Novel Pure, Dilute and Mixed Magnetic Insulators
RUI:新型纯磁、稀磁和混合磁绝缘体中的磁相变
- 批准号:
9213198 - 财政年份:1992
- 资助金额:
$ 20.04万 - 项目类别:
Continuing Grant
RUI: Magnetism and Phase Transitions of Mixed Magnetic Insulating Systems
RUI:混合磁绝缘系统的磁性和相变
- 批准号:
8906337 - 财政年份:1989
- 资助金额:
$ 20.04万 - 项目类别:
Continuing Grant
Research in Undergraduate Institutions: Magnetism and Phase Transitions of Transition Metal Compounds (Materials Research)
本科院校研究:过渡金属化合物的磁性与相变(材料研究)
- 批准号:
8511163 - 财政年份:1985
- 资助金额:
$ 20.04万 - 项目类别:
Continuing Grant
Acquisition of Equipment For Magnetism Research
磁学研究设备的购置
- 批准号:
8107444 - 财政年份:1981
- 资助金额:
$ 20.04万 - 项目类别:
Standard Grant
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