Patent ID: 7625640

Claim:
An electromagnetic noise suppressor having: a magnetic resonance frequency of 8 GHz or higher; and an imaginary part μ″ H of complex magnetic permeability at 8 GHz which is higher than an imaginary part μ″ L of complex magnetic permeability at 5 GHz, wherein the electromagnetic noise suppressor includes a composite layer including a heterogeneous structure where a binding agent and a magnetic material are integrated at the nanometer scale, wherein the composite layer includes a portion where a crystal lattice is observed to be made up of atoms of the magnetic material, a portion where only the binding agent is observed, and a portion where atoms of the magnetic material are observed to be dispersed in the binding agent without crystallizing, and the thickness of the composite layer is at least 0.005 μm and at most 0.3 μm; and the binding agent is at least one resin or rubber selected from the group consisting of polyolefine resin, polyamide resin, polyester resin, polyether resin, polyketone resin, phenol resin, epoxy resin, acrylic resin, polyacrylate resin, natural rubber, isoprene rubber, butadiene rubber, styrene butadiene rubber, butyl rubber, and ethylene propylene rubber.