The strength of neodymium magnets is the result of several factors

The strength of neodymium magnets is a result of several factors. The most important thing is that the tetragonal Nd2Fe14B crystal structure exhibits abnormally high uniaxial magnetic crystal anisotropy (HA ≈ 7 T - magnetic field strength H, in units of A/m and magnetic moment, in units of A · m2). This means that the crystal of the material is preferentially magnetized along a specific crystal axis, but it is difficult to magnetize in other directions. Like other magnets, neodymium magnet alloys are composed of microcrystalline particles, which are arranged in a strong magnetic field during the manufacturing process, so their magnetic axes all point in the same direction. The resistance of the lattice to its magnetization direction gives the compound a very high coercive force or anti demagnetism.