中文摘要：

通过简单的水热反应，分别在无外加诱导磁场和有外加磁场条件下合成了不同结构的磁性Co纳米材料。用XRD、SEM、TEM和PPMS分别表征了样品的晶相、形貌和磁性能。结果显示，无磁场下的样品（ZF样品）为单分散Co纳米球，而磁场下的样品（AF样品）为Co纳米球组装形成的一维链状结构，二者有相近的饱和磁化强度（分别为30．98、31．96A·m^2／kg），但其矫顽力和剩磁比却明显不同（ZF样品：901．87A／m、0．096；AF样品：8436．8A／m，0．047），认为这主要磁场诱导形成特殊一维链状结构的形状各向异性造成的。

英文摘要：

Through a facile hydrothermal process, monodispersed magnetic Co nanospheres （ZF sample） were synthesized and one-dimensional （1D） chain-like structures （AF sample） assembled by magnetic Co nanospheres were also successfully synthesized under the induction of an external magnetic field. The samples were characterized by means of XRD, SEM, TEM and PPMS. The measurements showed that AF and ZF had the similar saturation magnetizations （31.96 and 30. 98A · m^2/kg, respectively）. But the coercivity （Hc） and remnant magnetization ratio （Ms） of AF and ZF samples were drastically different. 8436.8A/m, 0. 047 and 901.87A/m, 0.096, respectively. And the main factor for these differences was the anisotropy of the special 1D chain-like structure.