The uniformity of the coils is often compromised by the coupling between ferromagnetic materials and coils. The spindle-shaped magnetic shielding cylinder (sMSC) has additional benefits over the MSC.

Abstract: To achieve the near-zero magnetic field environment necessary for magnetoencephalography (MEG) measurements, a two-stage magnetic compensation (TMC) system for background magnetic field ...

The solenoid seen above uses a body milled from HDPE and wrapped with magnet wire. The slug in the center is steel, with a few rare-earth magnets at the top. When you run current through the coil ...