Nanocomposite NcbFe_(14)B/α-Fe permanent magnets have attracted considerable attention in the last two decades, because of an enhanced remanence, a relatively high coercivity, and a high maximum energy product (BH)_(max). The excellent magnetic properties of these materials are known to arise from the exchange coupling interaction between magnetically hard and soft phases. The theoretical energy product of nanocomposite materials is about 1000kJ/m~3, which is larger than that of any other single phase...