Which class of magnets has the highest energy product? Which has the lowest? Use the chart of Remanent induction and Coercive force, Fig. 3.18, to find out.

Fig. 3.18

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Remanentinduction Br (7) 0.5 Remanent induction and coercive field Amorphous iron alloys Permalloy Ni-45% Fe Silicon iron Low carbon steel Permalloy Ni - 75% Fe Soft ferrites 0.2 Medium carbon steel High carbon steel Nickel Neodymium- iron boron Samarium cobalt Alnico Increasing energy product Ferro-magnets Ferrites Soft magnets 0.1 Hard ferrites Hard magnets MFA 15 0.1 1 10 100 Coercive field Hc (A/m) 103 104 105 106