The Sendust multilayer thin films were fabricated to improve magnetic properties by rf magnetron sputtering. The effective permeability of the film with 50 Å of a Ta2O5 middle layer was 1800 when annealed at 500°C. The coercivity of the film was 0.5 Oe. When the middle-layer thickness was thicker than 100 Å, the result showed no magnetic improvement in permeability and coercivity.