Magnetic materials neodymium-iron-boron alloys

New permanent magnet materials, such as samarium-cobalt and, a fortiori, neodymium-iron-boron alloys, are also of special interest in the design of static devices with specific magnetic-field configurations. Apart from high remanence and coercive force values of magnets made of these materials, Chavanne et al. (1987) emphasize the presence of large anisotropy fields in the conception of these devices. 

Samarium is a rare and relatively expensive material furthermore, the price of cobalt is variable, and its sources are unreliable. Consequently, the neodymium-iron-boron, Nd2Fci4B, alloys have become the materials of choice for a large number and wide diversity of applications requiring hard magnetic materials. Coercivities and energy products of these materials rival those of the samarium-cobalt alloys (Table 20.6). 

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