摘要
Crystalline Co nanocomposites in the rutile TiO2 were synthesized by 180 keV Co ion beam implantation at temperature of 623 K with the fluence of 4×10^16 cm^-2. The structural and magnetic properties of samples with different thermal treatment were characterized by synchrotron radiation X-ray diffraction （SR-XRD）, high resolution transmission electron mi- croscopy （HRTEM）, Rutherford backscattering/channeling and the superconducting quantum interference device magnetometer. The SR-XRD results reveal the formation of hcp and fce phases of Co clusters, and the SR-XRD and HRTEM show that Co nanocrystals （NCs） have been formed in TiO2 after ion implantation. With increasing of annealing temperature, the transition of hcp to fcc Co is observed, and the Co NCs sizes were increased with increasing post-annealing temperature. At annealing temperature 1073 K, the lattice damaged is significantly removed compared with the virgin sample. The Co NCs forming inside TiO2 are the major contribution of the measured ferromagnetism.
基金
The work was supported by the National Natural Science Foundation of China （No.10875004 and No.11005005）, and National Basic Research Program of China （No.2010CB832904）, the 2011 Self-Raised Funds Project of HeBei Science and Technology Bureau （No.11316736）, and the 2011 Key Project of the Langfang Teachers College （No.LSZZ201101）.
