Abstract
Co based amorphous films were plated from the bath with phosphorus acid as a metalloid source. The amorphous films with a thickness of about 1μm were successfully fabricated by peeling from a smooth electrode which was mirror-finished so that the center line average roughness was less than 0.5μm. Magnetic properties of these very thin films were examined and a discussion was developed for the relationship between the thickness of the films and the high frequency magnetic properties. The initial permeability of the film with 1μm thickness was high and constant value 3000 at a frequency of up to 10 MHz. Furthermore, the value of tan δ was exceedingly small.
