Greetings ! I was wondering if there are materials that have high magnetic permeability, yet aren't really ferromagnets - would not considrably increase the external field ? Alternatively, how about materials with high permeability that need relatively high fields to induce their own strong fields. For example, iron in magnetic field of a few Gauss will already produce a 1 T field, so how about materials that will need say hundreds of Gauss before they're really induced to Tesla scale field magnitudes ? Thanks a lot. Live long and prosper.