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A Limit to Predict Maximum Energy Product (BHmax) from the Magnetization Hysteresis Loop

Energy product of magnets, especially permanent magnets, is often used without a clear understanding of its definition, even though it is a basic concept that is widely known to relevant industry workers and researchers. In this article, we introduce the definition of energy product from the energy stored in the field outside the magnet as well as the correct method to predict its maximum value (BH max ) from a magnetization hysteresis loop.