Abstract

 Ti_1−xCo_xO_2−δ nanobelts were synthesized without using any metal catalysts by metallorganic chemical vapor deposition. The nanobelts consisted of ~10–20 nm nanocrystallites, which were dominantly rutile structure. The Ti_0.986Co_0.014O_2−δ nanobelt sample showed a magnetic anisotropy with a high coercive field value (~500 Oe) at room temperature, significantly affected by intrinsic effect. In contrast, the Ti_0.982Co_0.018O_2−δ nanobelt sample revealed isotropic magnetic characteristics due to enhanced Co clustering. A few or several Co clusters per nanobelt were typically observed even in the lightly Co-doped Ti_0.986Co_0.014O_2−δ nanobelts because of the very thin thickness (~20 nm) and high specific surface area of nanobelts.