Neodymium Iron Boron magnets are a type of rare earth alloy that typically has two atoms of Neodymium (Nd), 14 atoms of Iron (Fe), and one atom of Boron (B) as the primary elements. It has chemical composition of Nd2Fe14B. There are some other elements that are also used for purposes of increasing the coercivity, gaining lower oxidation characteristics and other such desirable characteristics. These elements are used to 'dope' the alloy, and are generally found in small quantities. These magnets are mechanically strong, gives the best fields possible in permanent. The temperature coefficient of Br is higher than Samarium Cobalt, so the material is more sensitive to temperature changes, ranging from 0.10%/°C - 0.13%/°C.

A neodymium magnet is a powerful magnet made of a combination of neodymium, iron, and boron. They are very strong in comparison to their mass. It is mechanically fragile and the most powerful grades lose their magnetism at temperatures above 176 degrees fahrenheit or 80 degrees Celsius. High-temperature grades will operate at up to 200 and even 230 °C but their strength is only marginally greater than that of samarium-cobalt. They have replaced marginally weaker and significantly more heat-resistant samarium-cobalt magnets in most applications, due mainly to their lower cost. It exhibits magnetic braking when moved near a non-magnetic metal due to induced eddy currents. They are used for stabilization and angular head motors in computer hard drives.