Effects of Co-doping level on the microstructural and ferromagnetic properties of liquid-delivery metalorganic-chemical-vapor-deposited Ti[sub 1-x]Co[sub x]O[sub 2] thin films

Seong, Nak-Jin; Yoon, Soon-Gil; Cho, Chae-Ryong
November 2002
Applied Physics Letters;11/25/2002, Vol. 81 Issue 22, p4209
Academic Journal
Polycrystalline Ti[SUB1-x]Co[SUBx]O[SUB2] thin films on SiO[SUB2] (200 nm)/Si (100) substrates were prepared using liquid-delivery metalorganic chemical vapor deposition, and the microstructure and ferromagnetic properties were investigated as a function of doped Co concentration. Ferromagnetic behaviors of polycrystalline films were observed at room temperature, and the magnetic and structural properties strongly depended on the Co distribution, which varied widely with doped Co concentration. The annealed Ti[SUB1-x]Co[SUBx]O[SUB2] thin films with x⩽0.05 showed a homogeneous structure without any clusters, and pure ferromagnetic properties of thin films are only attributed to the Ti[SUB1-x]Co[SUBx]O[SUB2] (TCO) phases. On the other hand, in case of thin films above x = 0.05, Co[SUB1-x]Ti[SUBx]. clusters having a soft magnetic (SM) property formed in a homogeneous Ti[SUB1-x]Co[SUBx]O[SUB2] phase, and the overall ferromagnetic (FM) properties depended on both FM[SUBTCO] and SM[SUBCo-Ti] . Co[SUB1-x]Ti[SUBx] clusters with about 150 nm size decreased the value of H[SUBc] (coercive field) and increased the saturation magnetic field.


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