【作者】 周鸣鸽；

【导师】 李卫； 侯仰龙； 朱明刚；

【作者基本信息】 钢铁研究总院 ， 材料物理与化学， 2013， 博士

【摘要】 磁性纳米材料因其独特的物理化学性质被广泛应用于磁记录材料、永磁材料、吸波材料、生物医药及化学催化等领域,随着对磁性纳米材料研究的不断深入,人们更加期望其向高性能、新功能方向发展,本课题以合成面心四方(fct)相FePt磁性纳米颗粒、Fe3O4立方颗粒为基础,以制备出FePt/Fe3O4双元磁性纳米颗粒自组装薄膜和基于软硬磁耦合的FePt-Fe3O4纳米复合材料为主要内容,以提高材料的磁性能为目标,开展了以下研究工作：1.以制备高矫顽力高剩磁的高密度分立FePt磁记录介质为目标,创新性的加入Mo(CO)6作为形貌诱导剂,利用高温液相法合成出了尺寸均一的具有立方形貌的FePt纳米颗粒；并且利用自组装的方式,简易有效地使10mFePt立方颗粒作为分立磁记录单元自发地组装为长程有序的纳米超晶格阵列薄膜,为高密度长程磁有序薄膜的制备奠定技术基础。2.基于磁性材料中软硬磁交换耦合而引发的剩磁增强效应,本论文在此基础上合成出与FePt立方颗粒尺寸相当的10nmFe3O4立方颗粒,采用自组装技术制备出了一系列FePt/Fe3O4双元薄膜,构筑了硬软磁纳米双相复合薄膜,为新型纳米双相耦合磁体开发和制备提供了一种更新的途径。3.通过优化合成路径和和调控制备参数,获得了一系列基于软硬磁耦合的纳米复合材料(FePt-Fe3O4异质结构、FePt@Fe3O4核壳结构的纳米线及纳米球、PtCo纳米颗粒等),并对其微观结构及磁性能进行表征,对开发新型磁性纳米材料有一定的借鉴意义。更多还原

【Abstract】 Nano-magnetic materials were widely used in magnetic recording materials, nano permanent magnet materials propertiesabsorbing materials, biomedical, chemical catalysis and other fields, because of their unique physical and chemical properties. Along with the deepening of the research on magnetic nanomaterials, people expect the emergence of higher performance magnetic materials. This topic based on the synthesis of Face-centered tetragonal(fct) FePt nanocubes and Fe3O4nanocubes, take the preparation of FePt/Fe3O4magnetic nanoparticles membrane as the main content, take the enhancing of magnetic properties as the main purpose.The main researchs of our work include the following aspects:(1) The goal of our topic is to prepared the FePt super-high density magnetic recording medium with high coercive force and high remanence.Using the method of high temperature liquid phase to synthesize a10nm fept cubic nanoparticles with uniform size, here we have creatively modified the synthesis by employing Mo(CO)6as the inducing agent. As-synthesized FePt nanocubes are lOnm and be assembled into arrays, thermal annealing of the FePt nanocube superlattice induces FePt structure transformation from fcc to fct phase. Thus, this work demonstrates progress in the development of magnetic recording media based on FePt nanoparticles.(2) We adopt the "bottom-up" self-assembly technique to prepare a series of FePt/Fe3O4dual membranes, and use10nm FePt and10nm Fe3O4to construct the hard and soft magnetic exchange coupling double magnetic nanoparticle arrays, the recent studies has found that through the soft and hard magnetic nanoparticles, the exchange coupling effect between medium can improve the residual magnetism. It provides a new way to develop the preparation of nanometer coupling magnet.(3) This dissertation is devoted to the design and controlled synthesis of exchange coupling nanocomposite magnets, such as heterogeneous FePt-Fe3O4nanoparticles, core-shell FePt@Fe3O4nanowires and nanospheres, PtCo nanoparticles. It’s beneficial to the develop of new nano-magnetic materials.更多还原