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A complete table of the ac susceptibility ## \chi_m ## of various ferromagnetic materials, where ## M=\chi_m H ##, is something that I have had trouble finding in a google of ferromagnetic materials. In what I have been able to come up with to date, there is quite a spread in the values of susceptibility for ferromagnetic materials, presumably because the applied ## H ## can be quite small and the magnetic state that occurs in these ac type materials is close to that of a permanent magnet, where ## H ## can be zero and the magnetization ## M ## persists. ## \\ ## One article that I was able to google contained a very incomplete table. http://electrons.wikidot.com/ferromagnetic-materials. I would welcome any similar articles that describe the differences in materials that determines whether a given material results in a permanent magnet, or whether a material has a high ac susceptibility, but returns to near zero magnetization upon removal of the applied field ## H ##.