Coercivity & retentivity (Permanent & electromagnets) | Magnetism & matter | Physics | Khan Academy

Ferromagnets with high retentivity and coercivity are used as permanent magnets (hard magnets), while the ones with low retentivity & coercivity (soft magnets) are used as cores in electromagnets. But all ferromagnets have high permeability.
Let's explore these differences between the permanent magnets and the ones used in electromagnets, by looking at their hysteresis loops.
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Very nice video. Excellent way of explaining. However, one topic to discuss is, a permanent magnet in its fully magnetized form will basically have very low permeability as no external magnetic field can cause the change in internal magnetic field? Only with respect to magnetic materials, we can have this comparison and no with permanent magnets which has no influence on the Bo value applied externally. This is basically what i understand. Please correct me if i am wrong in understanding. Thank you very much

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