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Neodymium iron boron magnet, also known as neodymium magnet or NdFeB magnet, is a tetragonal crystal system composed of neodymium, iron, and boron (Nd ₂ Fe ₁₄ B). The magnetic energy product (BHmax) of this magnet is greater than that of samarium cobalt magnets, making it the material with the largest magnetic energy product in the world at that time. Neodymium iron boron magnets are permanent magnets with magnetic properties second only to absolute zero degree holmium magnets, and are also the most commonly used rare earth magnets.

Neodymium iron boron magnets have the characteristics of high residual magnetism, high coercivity, and high magnetic field strength, as well as low resistivity, low temperature coefficient, good corrosion resistance, high mechanical strength, good toughness, and strong plasticity. These advantages make neodymium iron boron magnets widely used in fields such as electronic industry, computer technology, communication equipment, automotive manufacturing, and construction engineering.

In addition, to avoid corrosion damage, neodymium iron boron magnets need to be protected on the surface of permanent magnet materials during use, such as electroplating with gold, nickel, zinc, tin, and surface spraying with epoxy resin. At the same time, neodymium iron boron magnets are also divided into two types: sintered neodymium iron boron and bonded neodymium iron boron. Among them, sintered neodymium iron boron is prone to corrosion and requires a coating on the surface, generally including galvanized, nickel, environmentally friendly zinc, environmentally friendly nickel, nickel copper nickel, environmentally friendly nickel copper nickel, etc; And the bonded neodymium iron boron has magnetism in all directions and is corrosion-resistant.