Abstract
A new alternating field demagnetizer for paleomagnetic studies was constructed. In this new apparatus, we do not need to rotate or tumble specimens at all. The magnetic field itself tumbles in three dimensional space and its intensity is gradually reduced to zero. This tumbling of magnetic field is created by three orthogonal pairs of coils carrying an alternating current and two modulated currents, respectively. The alternating field demagnetization is now possible for any soft material such as young loose sediments. This apparatus is capable of demagnetizing 8 cubic specimens (2.5×2.5×2.5cm) together.
