You must have experienced or heard of a magnetic levitation train. It is a modern high-tech rail vehicle with many advantages. For example, superconducting maglev trains can reach 500 to 600 km/h. What makes it so fast? It comes from a material called rare earth permanent magnets.
The maglev train uses rare earth permanent magnets. It is estimated that the construction of a maglev train requires 1.5 tons of NdFeB per mile. The Japan Institute of Superconductivity Engineering has invented a magnetic flux pinning type magnet (Neomax-C series magnets for liquid nitrogen temperature) that allows the fine non-superconducting phase to be artificially dispersed in a porcelain and ceramic superconductor, thereby enabling magnetism. When it is fixed there, it becomes a strong magnet when it is massive. If this superconducting magnet is combined with a conventional permanent magnet, the magnet can be floated in an arbitrary space and fixed (it can only float with the repulsion between the magnets, and cannot be fixed). Moreover, if the magnet is distributed uniformly in the direction of rotation, the rotation is not subject to any resistance (a ring magnet that is magnetized in the height direction easily meets this condition). Using this principle, magnetic bearings or flywheel-type power storage systems can be put to practical use.
The use of NdFeB maglev trains can increase the levitation gap and reduce the accuracy of the orbit.