抄録
This study reports the application of a magnetic alloy/nonmagnetic insulator multilayer film to EMI noise filters. The eddy-current skin effect in the magnetic alloy layers was used to realize high-loss properties. In a CoZrNb/SiO2 film, the thickness of each layer and the magnetic anisotropy were designed so that the film would exhibit high-loss properties in the 30∼1000 MHz frequency range. A large impedance and noise attenuation for common-mode noise in this frequency range were confirmed in a noise filter tube incorporating the high loss film. In comparison with a ferrite core, a miniaturization of ∼1/102 was achieved in the noise filter tube.
