Construction toys that use neodymium magnets as building blocks are small in size and stick together strongly. For small children’s toys, the magnets are embedded in large, hard-to-swallow plastic parts. The magnets in adult construction kits have a nickel coating. Neodymium magnets also see use as couplers for toy trains and in magnetic puzzles.
Electric motors use permanent magnets. The stronger the magnet in a motor, the more power the motor develops. The high strength of neodymium magnets creates small motors with more power than ceramic, iron or other magnet types. Compact neodymium-magnet motors run electric cars, scooters and bicycles.
Scientific demonstrations benefit from the neodymium magnet’s strong magnetic field. The Meissner Effect, a popular demonstration of magnetic levitation with superconducting materials, works best with the strongest possible magnet. Other demonstrations include bending an electron beam in a cathode ray tube with a magnet’s field and dropping a magnet down a long aluminum tube to show Lenz’s Law.
Neodymium magnets have improved the sound quality of portable and desktop music players. Stereo speakers, earphones and ear buds contain tiny magnets that vibrate a diaphragm from an electronic signal, making sound. The strength of neodymium magnets allows small devices to produce high-quality music.