Controlled synthesis and assembly into anisotropic arrays of magnetic cobalt-substituted magnetite nanocubes
Controlled synthesis and assembly into anisotropic arrays of magnetic cobalt-substituted magnetite nanocubes
复制标题
磁性钴取代磁铁矿纳米立方体的受控合成和组装成各向异性阵列
作者：
Yang Weiwei;Yu Yongsheng;Wang Liang;Yang Chunhui;Li Haibo
本文报道了用溶液合成法制备的Co、Fe、O组成分布均匀的立方钴取代磁铁矿CoxFe3−xO4纳米立方。通过对反应条件的控制，可以使立方纳米颗粒的尺寸从35 nm调整到110 nm。研究发现，在Si衬底上，立方结构容易诱导纳米芯片的（400）取向，在平面外方向施加外加磁场可以进一步增强纳米芯片的（400）取向。在外加磁场中组装纳米粒子可获得最高的矫顽力为2.07 kOe。已报道的磁性钴取代磁铁矿纳米颗粒为研究具有易于控制的磁对齐的铁磁性纳米颗粒（NP）组件提供了理想的构建模块，用于磁带记录，具有不断增加的面积存储密度。
Cubic cobalt-substituted magnetite CoxFe3−xO4 nanocubes (NCs) with uniform composition distributions of Co, Fe and O in the NCs, obtained via solution synthesis, are reported in this paper. Through the control of the reaction conditions, the size of the cubic NCs could be tuned from 35 to 110 nm. It was found that the cubic shape could easily induce the (400) orientation of the NCs on a Si substrate, and applying an external magnetic field in the out-of-plane direction could further enhance the (400) orientation of these NCs on the Si substrate. The highest coercivity of 2.07 kOe could be obtained by assembling the NCs in the external magnetic field. The reported magnetic cobalt-substituted magnetite NCs provide an ideal class of building blocks for studying ferrimagnetic nanoparticle (NP) assemblies with easily controlled magnetic alignment for magnetic tape recording with ever increased areal storage density.