Magnetic Properties of La-Co Substituted Ba Ferrite Thin Films Prepared by a Sol-Gel Method

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La-Co substituted BaM (La-CoBaM) thin films have been prepared by a sol-gel technique involving a spin coating of metal-organic compounds. We report the effects of Pt under-layer on the c-axis orientation of La-CoBaM films and their magnetic properties. On the Pt under-layer with the thickness of 120 nm whose ‹111› axis oriented perpendicular to substrate surface, the La-CoBaM films with the thickness ranging from 20 to 95 nm were coated at room temperature. These coated films were annealed at 900°C for 5 h. in air. The Hc⊥/Hc// value for the La-CoBaM films with the thickness of 20 nm was 3.9 that was the largest of all samples. The c-axis of magnetoplumbite phase was oriented perpendicular to the film surface, that was caused by the effect of the (111) oriented Pt under-layer.
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