Fe掺杂对Zn1 xCoxO纳米晶体结构及磁性行为的影响

利用溶胶-凝胶法制备了Fe掺杂Zn1 xCoxO(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Zn1 xCoxO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.

Effect of Fe-Doping on Structure and Magnetic Behavior of Zn1-xCoxO Nano-crystal Powders

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.