Solid material for the magnet and its manufacturing method

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PROBLEM TO BE SOLVED : To obtain solid material for a magnet which has density higher than 7.45 g/cm and is superior in magnetic characteristic, thermal stability and oxidation resistance, without using binder or depending on self-sintering. SOLUTION : After rare earth/iron/nitrogen/hydrogen based magnetic powder having Th2 Zn17 type crystal structure is subjected to pressed power molding in a magnetic field, compression caking is performed by using underwater shock wave whose shock wave pressure is 8-40 GPa.