ECONOMICAL FERRITE-TYPE MAGNETS WITH ENHANCED PROPERTIES

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The invention concerns a ferrite magnet comprising a magnetoplumbite phase of formula M1-xRxFe12-yTyO 19, wherein : M represents at least an element selected among the group consisting of : Sr, Ba, Ca and Pb; R represents at least an element selected among rare earths and Bi; T represents at least an element selected among Co, Mn, Ni, Zn; 0, 15 < x < 0.42; 0.50 < α = y/x < 0.90, so as to provide a ferrite magnet having both a reduced level in element T and a global performance index GIP = Br + 0. 5. Hk not less than 580, and preferably not less than 585, Br being the remanent induction expressed in mT, Hk corresponding to the field H expressed in kA/m, for B = 0.9.Br. © KIPO & WIPO 2007