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The effect of TiN layers on the coercive force and magnetoresistive properties of sputtered Fe-Co-Ni films was studied. It was found that the H c of films deposited on a TiN layer is reduced by 30-40%. This is a result of the formation of certain film microstructures. The insertion of a TiN interlayer reduces H c by 30-40% due to the magnetostatic interaction of the magnetic layers.