US Patent 7485366 - Thick film magnetic nanoparticulate composite

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Magnetic materials are formed with domains based on regions of atomic alignment. However, the proximal arrangement of multiple of these domains can cause undesirable interference or resonance in some instances. This patent from Inframat teaches a magnetic nanoparticle film that reduces such problems by eliminating the proximity of the domains and allowing higher frequency responses. Claim 1 reads:

1. A thick magnetic/insulator film comprising magnetic particles, wherein each magnetic particle is surrounded by an insulating layer, wherein the magnetic particles have grain sizes with average dimensions of about 1 to 100 nanometers, and wherein the thick film has a thickness of about 10 micrometers to about 3 millimeters.