复合磁性纳米线和纳米管的制备、磁电及高频微波特性研究

The magnetic nanowires (NWs) and nanotubes (NTs) with artificial structures and composite materials show varies novel nanoscale size, dimension and surface effects. Due to their interesting physics properties, excellent material properties and wide applications, they have attracted great attention. In this project, we will study two type of nanowires/nanotubes, namely carbon nanotubes (CNT)-magnetic NWs/NTs and BiFeO3 (BFO)-magnetic NWs/NTs which both have artificial coaxial core-shell structure and show rich physics properties. We will focus on their preparation, magnetic properties, magnetoelectric transport, electric polarization, magnetoelectric coupling, microwave properties and multi-field modulation effects. The innovation features of this project are that the various interesting physics properties and effects of CNT-magnetic NWs/NTs and BFO-magnetic NWs/NTs are dominated by their artificial interfaces which are limited in one-dimension nanoscale, and can be multi-field modulated through various interface coupling. In addition, so far as we know the microwave properties of our CNT-magnetic NWs/NTs and BFO-magnetic NWs/NTs are rare reported, our study on their microwave properties would be other innovation features of this project. The implementation of this project shall promote our understanding of CNT-magnetic NWs/NTs and BFO-magnetic NWs/NTs preparation and physics properties, and provide material and physic basis for various potential applications the CNT-magnetic NWs/NTs and BFO-magnetic NWs/NTs.

具有人工结构的复合磁性纳米线和纳米管有着纳米尺度下许多新奇的尺寸、维度与表面效应，表现出优越的材料物性，并有广阔的应用前景，因而吸引了广泛的研究。本项目拟就两类具有同轴/核壳结构的新型且具有丰富物理内容和重要应用前景的复合磁性纳米线和纳米管材料，即碳管-磁性纳米线/纳米管与铁酸铋-磁性纳米线/纳米管的制备、磁性与磁电输运、电极化与磁电耦合、高频微波特性和多场调控效应开展基础物理研究。其特色和创新在于上述各物性和物理效应被限制在一维和纳米尺度下，且与复合界面——碳管/磁性和铁酸铋/磁性界面——性质密切相关，可通过复合界面实现多场调控；另外，目前对上述复合磁性纳米线和纳米管的高频特性鲜有报道，因此开展其高频微波特性分析是本项目又一特色与创新。通过本项目实施将深化对上述复合磁性纳米线和纳米管制备和多方面物性的认识；为探索基于上述复合磁性纳米线和纳米管的新型器件应用提供材料和物理基础。

具有人工结构的复合磁性纳米线和纳米管有着纳米尺度下许多新奇的尺寸、维度与表面效应，表现出优越的材料物性，并有广阔的应用前景，因而吸引了广泛的研究。本项目拟就两类具有同轴/核壳结构的新型且具有丰富物理内容和重要应用前景的复合磁性纳米线和纳米管材料，即磁性复合碳管和磁性纳米线/纳米管的制备、磁性与磁电输运开展基础物理研究。在磁性金属纳米线与纳米管的制备和磁性纳米颗粒复合的碳纳米管制备方面获得一定进展，获得并表征了多种磁性金属纳米线和纳米管、研究了磁性金属/金属氧化物复合同轴纳米管中的交换偏置效应，以及磁性纳米颗粒复合的碳纳米管中的磁电输运性质。上述研究为复合磁性纳米线和纳米管的新型器件应用提供材料和物理基础。