Fe掺杂对Zn_(1-x)Co_xO纳米晶体结构及磁性行为的影响

Effect of Fe-Doping on Structure and Magnetic Behavior of Zn_(1-x)Cox_O Nano-crystal Powders

利用溶胶-凝胶法制备了Fe掺杂Zn1-xCoxO(x=0.01～0.02)纳米晶体.通过XRD,TEM和VSM对其结构、晶格参数和磁性进行了表征和分析.所有样品都没有检测到非晶态产物以及Fe,Co团簇等第二相,即Fe掺杂没有改变Zn1-xCoxO晶体的纤锌矿型ZnO结构、晶粒度大小以及室温铁磁性.随着Fe掺杂浓度的提高,饱和磁化强度、剩余磁化强度和矫顽力等磁性参数都有相应的改善.Fe掺杂还引起了交换偏置,并且,该现象随着Fe掺杂浓度的提高而增强;但是,单原子Fe对饱和磁化强度的贡献低于单原子Co对自发磁化强度的贡献,这表明Fe,Co共掺杂ZnO材料与Co掺杂ZnO材料的磁性机制有所不同.

The Fe-doping Zn1-xCoxO nano-crystal powders were prepared by the sol-gel method.The crystal structures,lattice parameters,and magnetic properties were characterized and analyzed using the X-ray diffraction,transmission electron microscopy,and vibrating sample magnetometer.Amorphous materials and secondary phase such as Fe or Co groups are not detected in all the synthesized samples,which indicate that the Fe-doping does not change the hexagonal structure of the wurtzite ZnO,the sizes of the particles and the ferromagnetic behavior of Zn1-xCoxO at room temperature.However,the magnetic parameters such as the saturation magnetization intensity,remnant magnetization intensity,coercive force and the exchange bias are improved with increasing the Fe-dopant.Furthermore,the contribution of single Fe atom to spontaneity magnetization is lower than that of the single Co atom.It indicates that the Fe and Co co-doped ZnO is different from the Co doped ZnO in the magnetic mechanism.