Fig. 7
From: An ultra-low magnetic field thermal demagnetizer for high-precision paleomagnetism
a Photo of the new furnace chamber. b Current field (red triangles) with 1 A applied to the heating wire along longitude axis in the newly designed furnace (multiple curves represent different vertical distances from the central axis). c Current field with 1 A applied to the heating wire along longitude axis in conventional furnace, the current of adjacent solenoids is opposite. d Current field with 1 A applied to the heating wire along longitude axis in conventional furnace, currents of adjacent solenoids in each group are opposite, but two groups in parallel connect