基于NiAs层状结构交换偏置磁性材料的设计与性能研究

项目名称： 基于NiAs层状结构交换偏置磁性材料的设计与性能研究

项目编号： No.21471112

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 赵炯鹏

作者单位： 天津理工大学

项目金额： 85万元

中文摘要： 交换偏置现象在自旋电子学等诸多相关领域有着广泛的应用前景,成为磁性材料研究的热点之一。然而，其相关偏置机理的理论却不完善有待进一步探索。分子基磁性材料具有明确的结构和化学组成可控的优点，为构效关系的研究带来方便，其研究领域涉及磁性研究的多个热点方向。然而，在交换偏置研究领域，罕有分子基化合物的身影；在分子基磁性材料中交换偏置现象的研究缺乏足够的实验、理论的支持而显的寥寥。系统进行分子基交换偏置材料的构筑和性能研究，可以为我们研究交换偏置现象与理论打开新的大门，拓宽分子基材料的应用领域。本课题致力具有交换偏置的分子基磁体的设计、合成、磁性研究与调控。通过文献调研，我们设计了具有砷化镍层状的钙钛矿结构的混价态分子基化合物，及其包覆纳米氧化物形成核壳结构的复合材料等，构筑具有交换偏置特征的新型材料。通过合成条件条件控制所得材料的结构、尺寸和形貌，调控材料的性能，深入探索构效关系。

中文关键词： 交换偏置；NiAs结构；异自旋；壳层结构；磁各向异性

英文摘要： The prineipal of the exehange bias(EB)is one of the essential physieal mechanisms in the applications of spintronics，and has become one of the most active domains in the research of the magnetic materials. The mechanism of perpendicular exchange bias, however, is still in controversy. The extensive studied molecule based magnetic materials have unambiguous structure and tunable chemical composition that make it favorable in structure-function relationship study. However, among the materials with EB effect there is rare molecule complexes, and the EB effect is not drawn much attentions of the chemists working in the field of molecule based magnetic materials. The construction and study of molecule based magnetic materials with EB effect will bring new opporunity for the comprehending the mechanisms of EB effect, and broaden the study field of molecule materials. In this work mixed valence Niccolite （NiAs）structural layered molecule based magnetic complexes and core-shell heterostructures based on those complexes will be designed, constructed and magnetism characterized. And great EB effect will be expected in the NiAs layered and core-shell structure materials. And the performance of the aimed materials will be tuned by the control of the structure size and morphology. The mechanism of the EB and structure-magnetic relationship will be explored.

英文关键词： Exchange bias;Niccolite Structural;Heterospins;Core-hell heterostructure;Magnetic Anisotropy