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Relevance. Rating Newest Oldest. Best Answer: In a generator, residual magnetism, also known as 'remanence' or remanent flux, is due to the hysteresis of the magnetic material in the core. When the current is removed, the magnetic flux often remains at some non-zero value. This is a characteristic phenomenon of ferromagnetic materials.
If a permanent magnet could decay at the rate given in Rook's answer above there would be none found in geological strata. A permanent magnet has a permanent orientation of the magnetic moments in a specific vectorially additive direction depending on small crystal domains.To change, i.e. be demagnetized, the magnetic moments have to be randomized by either an external magnetic field or excess heat/melting or vibrations possibly.f a permanent magnet could decay at the rate given in Rook's answer above there would be none found in geological strata. A permanent magnet has a permanent orientation of the magnetic moments in a specific vectorially additive direction depending on small crystal domains.