Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1805185 | Journal of Magnetism and Magnetic Materials | 2007 | 5 Pages |
Abstract
TiO2:Co thin films of high Co concentration were investigated by the high resolution transmission electron microscopy, physical property measurement system and energy dispersive X-ray. The as-deposited films are amorphous magnetic semiconductors and we did not find any Co metal particles in them. The electronic transport process in the low-temperature range below 80 K could be described by the spin-dependent variable-range-hopping process. However, after the samples were annealed at 300 °C, large amounts of Co metal particles were observed to connect each other and the films show a metallic behavior. The origin of ferromagnetism of the thin films is also discussed.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Hong-Qiang Song, Yong Wang, Shi-Shen Yan, Liang-Mo Mei, Ze Zhang,