ZrO2 thin films were deposited by r.f. reactive unbalanced magnetron sputtering. The influence of electromagnetic coil current on microstructure and optical properties of the films was investigated. At low coil current of 0.2A, small grains are produced. With the increase of coil current, the deposition rate and surface roughness are decreased and the packing density in proportion to the refractive index is increased remarkably. The refractive index is as high as 2.236 (at λ=600nm) at 0.4A. At the high coil current of 0.6A, grains appear to grow up due to thermal effects and therefore optical properties of the films are deteriorated a little.
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