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The electroless plated soft magnetic under layer (SUL) film with low magnetic noises was developed by annealing in a magnetic field to add planar anisotropies, such as radial or circumferential directions. The grain size reduction by increasing B content in a SUL film is found to be effective to decrease the noise power. Radial anisotropy SULs show lower noises than circumferential anisotropy SULs...