Synthesis and Magnetic Properties of Ferrimagnetic CoFe2O4 Nanoparticles Embedded in an Antiferromagnetic NiO Matrix
Synthesis and Magnetic Properties of Ferrimagnetic CoFe2O4 Nanoparticles Embedded in an Antiferromagnetic NiO Matrix
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DOI：
10.1021/cm702464e
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发表时间：
2008-07
影响因子：
8.6
通讯作者：
M. Artus;S. Ammar;L. Sicard;J. Piquemal;F. Herbst;M. Vaulay;F. Fiévet;Vincent Richard
中科院分区：
文献类型：
--
作者：
M. Artus;S. Ammar;L. Sicard;J. Piquemal;F. Herbst;M. Vaulay;F. Fiévet;Vincent Richard
在二乙二醇中强制水解制备超细钴铁氧体纳米颗粒，离心后分散在相同的溶剂中形成溶胶，其中沉淀层状羟基乙酸镍盐。将得到的复合材料在空气中适度煅烧，形成由铁磁性CoFe2O4核心嵌入结晶良好的反铁磁性NiO组成的纳米颗粒。通过将这些颗粒的磁性数据与机械分散在抗磁性Al2O3基体中的新鲜CoFe2O4颗粒的磁性数据进行比较，分析了交换偏置特征的磁性性能，如矫顽力、磁滞回线位移和阻塞温度。
Ultrafine cobalt ferrite nanoparticles were prepared by forced hydrolysis in diethyleneglycol and, after centrifugation, dispersed in the same solvent to form a sol in which a layered hydroxyacetate nickel salt was precipitated. The as-obtained composite was moderately calcined in air to form nanoparticles constituted by a ferrimagnetic CoFe2O4 core embedded in well-crystallized antiferromagnetic NiO. Magnetic properties such as coercivity, hysteresis loop shift, and blocking temperature were analyzed regarding exchange bias features by comparing the magnetic data measured on these particles to those obtained on fresh CoFe2O4 particles mechanically dispersed in a diamagnetic Al2O3 matrix.