Vacuum Annealing Induced Room-Temperature Ferromagnetism in Co0.1Ti0.9O2-δ Films Prepared by Sol-Gel Method
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Abstract
The Co-doped TiO2 films (Co0.1Ti0.9O2-8710;) are prepared on silicon substrates by sol-gel method and post annealing. The Co0.1Ti0.9O2-8710; film annealed in air is non-ferromagnetic at room temperature. After further annealed in a vacuum, the room-temperature ferromagnetism (RTFM) is observed. Experimental evidences show that the RTFM in the Co0.1Ti0.9O2-8710; film may come from the Co-doped TiO2 matrix and is related to the oxygen vacancies created by vacuum annealing.
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