Four Neodymium Iron Boron (NdFeB) magnets are bonded to
the two tungsten masses again increasing the inertial mass
within the volume. NdFeB rare earth permanent magnets have
the highest flux density of any commercially available magnets.
In addition, zinc coated mild steel (Zintec) keepers are bonded
to the magnets to act as flux guides completing the magnetic
flux circuit. The beam in this study was etched from a sheet of
50µm thick beryllium copper. Stainless steel and silicon beams
have also been employed with this design, the results of which
have been previously reported elsewhere [4,5].