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The figure gives experimentally measured B vs. H variation in a ferromagnetic material. The retentivity, coercivity and saturation, respectively, of the material are
Retentivity is the value of $$B$$ when $$H = 0$$: $$B_{\text{retentivity}} = 1.0\text{ T}$$
Coercivity is the value of $$|H|$$ required to reduce $$B$$ to zero: $$H_{\text{coercivity}} = 50\text{ A/m}$$
Saturation is the maximum value of $$B$$ where the curve flattens out: $$B_{\text{saturation}} = 1.5\text{ T}$$
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