一维钴纳米材料的化学制备及磁学应用

Chemical Preparation and Magnetic Application of One-dimensional Cobalt Nanomaterials

一维钴纳米材料因其磁性能良好、居里温度高等特点,为制备非稀土基永磁材料提供了可能。介绍了一维钴纳米材料的研究进展和磁学应用现状,对一维钴纳米材料在化学制备方法、微观结构、磁学应用前景等方面进行了分析。一维钴纳米材料的化学制备方法较多,包括化学还原法、金属有机前驱体热解法、模板法等,且不同化学方法各具其特点,适用于不同长径比的一维钴纳米材料的制备。着重介绍了几种常用的化学制备方法,并针对一维钴纳米材料所具备的高磁晶各向异性和形状各向异性带来的高矫顽力(Hc)、高饱和磁化强度(Ms)、高剩余磁化强度(Br),以及高最大磁能积((BH)max)等优点,总结了其在永磁材料、高密度磁存储等磁学领域的应用具有重要的研究前景和研究意义。

One-dimensional(1 D)cobalt nanomaterials provide the possibility for the free rare earth based permanent magnetic materials due to their excellent magnetic properties and high Curie temperature.In the present work,the latest research progresses and magnetic application of 1 D cobalt nanomaterials were introduced.The chemical preparation methods,microstructures and application prospects of 1 D cobalt nanomaterials were studied and analyzed.There were several chemical preparation methods of 1 D cobalt nanomaterials,including chemical reduction method,decomposition of organometallic precursors,template method,etc.Different chemical methods had their own characteristics and could be used to prepare 1 D cobalt nanomaterials with different aspect ratio and morphology.Several commonly used chemical preparation methods were introduced in this review.In view of the advantages of 1 D cobalt nanomaterials,such as high coercivity(Hc),high saturation magnetization(Ms),high remanence magnetization(Br),and high maximum magnetic energy product((BH)max),which were caused by their high magneto crystalline anisotropy and shape anisotropy,the development of their applications in permanent magnet materials,high-density magnetic storage and other magnetic fields had important research prospect and significance,which caused wide attention of researchers.