Abstract
The graphical construction in which an optimum load line B = ( B r H o ) H , H c < 0, defines the maximum energy product of a permanent magnet, is rigorously correct when B( H) in the second quadrant fits the branch of a single hyperbola. It fails as an approximation for some magnets with square ( B − μ 0 H) vs. H loops, and alternative procedures for dealing with such magnets are described.
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