Archaeomagnetic dating definition

The Earth's field changes in both strength (intensity) and direction over time.

Archaeomagnetic dating Archaeomagnetic dating uses the ability of certain materials to record the Earth's magnetic field (geomagnetic field) to provide a date.This can be carried out using an alternating magnetic field (alternating field demagnetisation) or by heating the material (thermal demagnetisation).: demagnetisation by heating above a critical temperature followed by cooling in zero magnetic field to room temperature.Archaeomagnetic dating relies on the measuring the orientation of iron particles in burnt deposits towards the magnetic pole.The pole moves around, but magnetised deposits stay fixed on its position at the time of burning.

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