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Faraday rotations of the BaCo x Ti x Fe 12-2x O 19 (0 ≤ x ≤ 0.8) hexagonal ferrite films, prepared by the dip-coating method, were measured in the range from 500 to 2500 nm at room temperature. Spectra of cobalt and titanium doped ferrite films showed local extrema at 625, 750, 1475 and 1725 nm which are due to the presence of Co 2+ in tetrahedral positions.
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