Derive the formula for the maximum energy product of an ideal ferromagnet in Figure 9.24.

Figure 9.24

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MH hysteresis loop for ideal hard ferromagnet M -Ha given that M = Mremanent Mat +H in T in Am- B = H (H+M): (Equation 9.7) Corresponding BH loop (BH)max -Ho B B = Ho(H + Memanent) when H = 0, Bremanent = HoMremanent when B = 0, -H = M, remanent H at (BH)maxi H=-Mremanent/2 (BH)max HoMremanent2/4|= Bremanent 214 Ho