PURPOSE:To enhance heat-resisting propery as well as to block the slipping off of powder grains by a method wherein, when a compound permanent magnet is formed using yttrium, lanthanides rare-earth intermetallic compound powder, resin is impregnated into the cavity generated when a compression molding and a hardening by heat are performed in a magnetic field. CONSTITUTION:A solution treatment and an aging treatment are performed on the magnetic powder consisting of yttrium and lanthaides rare-earth metal element in a non-oxidizing atmosphere for the purpose of maintaining magnetic property, 0.5-8wt% of one-pack type or two-pack type epoxy resin binder is added to the above, and they are mixed and kneaded. Then, after the above- mentioned material has been compression-molded in a mold using a magnetic field of 8kOe or above, the above is heated up at 100-180 deg.C, and the resin binder is cured. Subsequently, the above-mentioned is placed in a vacuum vessel wherein one-pack type epoxy resin is filled, the degree of vacuum of 10-1-10-6 Torr is obtained, and resin is impregnated into the cavities which were generated when the previous process is performed. These cavities may be filled by applying hydrostatic pressure instead of performing a vacuum treatment.
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