%0 Journal Article
%T Magnetic properties and exchange bias effect of nano-structure CoxFe3-xO4 porous microspheres<br>纳米结构CoxFe3-xO4多孔微球的磁性及交换偏置效应研究
%A Lü Qing-Rong
%A Fang Qing-Qing
%A Liu Yan-Mei
%A <br>吕庆荣
%A 方庆清
%A 刘艳美
%J 物理学报
%D 2011
%I 
%X Nano-structure CoxFe3-xO4 porous microspheres are synthesized in ethylene glycol (EG) solution, using FeCl3·6H2O, CoCl2·6H2O and NH4Ac as the starting materials through solvothermal route. X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) are used to characterize the structures of synthesized products. The results show that monodisperse CoxFe3-xO4porous microspheres with polycrystal structures are assembled by nanoparticles, and the average diameters is about 300 nm. The magnetic properties are evaluated with a vibrating sample magnetometer (VSM). The results indicate that the saturation magnetization ( Ms) and the Curie temperature (Tc) first increase and then decrease, and the coercivity (Hc) increase with the increase of Co2+ content. According to the hysteresis loops at different temperatures, CoxFe3-xO4 porous microspheres possess remarkable exchange bias effects at low temperatures.
%K CoxFe3-xO4
%K porous microspheres
%K magnetic properties
%K exchange bias<br>CoxFe3-xO4
%K 多孔微球
%K 磁性
%K 交换偏置效应
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=899C84FE70921B4CB8EB2F91EFDC9CAE&yid=9377ED8094509821&vid=BFE7933E5EEA150D&iid=E158A972A605785F&sid=46682C11199DA00C&eid=A0C7970CD30381EA&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=24