The NeoLev™ Board is a technology demonstrator working on the principle of diamagnetic levitation involving a board and a special surface. Certain materials exhibit a strong magnetic pole repulsion when brought in the presence of a powerful magnet. Known for its superior thermal conductivity properties, pyrolytic graphite also has the highest diamagnetic characteristics of any man-made substance. We use this material as the "board" since it is not only rigid but lightweight enough to levitate.
The levitation surface involves a special arrangement of high grade rare earth magnets called a Halbach Array. The magnet poles are pointed in such a way to produce a greater magnetic force on the top surface while effectively cancelling the force on the bottom surface.
When the board is placed on the top surface, the magnet forces repel the pyrolytic material in such a way to offset the weight of the material. And voila... levitation! Also, the geometry of the board is such to fit within the magnetic flux wells so it is laterally stable and remains in place. Finally, when using long axial magnets, the board can not only hover and remain stable sideways, but can move almost frictionless forward and backward. Cool, huh?