Remanent Magnetism

Also called residual magnetism, refers to the permanent magnetization preserved within the ferromagnetic minerals inside rocks, like meteorites. The presence of a magnetic field assumes and requires a differentiated parent body that contained a liquid core sometime in its past. When a rock cools below its Curie temperature, it acquires its primary component of remanence magnetism (thermo-remanent magnetism), and preserves its parent body’s magnetic field. Rocks can also contain evidence of superimposed secondary components of natural remanent magnetism. Natural remanent magnetization forms the basis of paleomagnetism.