Bonded magnet, compound, and ferrite powder used roll and method of manufacturing the same

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A ferrite powder for bonded magnets having a magnetoplumbite-type crystal structure, said ferrite powder for bonded magnets having a basic composition represented by the following general formula (A 1-x R x )O€¢n[(Fe 1-y M y ) 2 O 3 ] by atomic ratio, wherein A is Sr and/or Ba; R is at least one of the rare earth elements including Y, La being indispensable; M is at least one of the elements Co, Mn, Ni and Zn; and x, y and n are numbers meeting the following conditions 0.01 ‰¤ x ‰¤ 0.4, 0.005 ‰¤ y ‰¤ 0.04, and 5 ‰¤ n ‰¤ 6. Said powder is produced by preparing a ferrite composition having said basic composition by calcination, pulverising or milling the resultant ferrite composition, and heat-treating the pulverised ferrite powder.