Magnetic properties of substituted W and X hexaferrites

Abstract

Magnetic measurements were performed on Sr-hexaferrites of type Me2+2–Sr(W) with Me2+2=Fe2+, Ni2+, Co2+, Zn2+, and Me2+-Sr(X) with Me2+=Fe2+, Zn2+ in the temperature range 5K 750 K. The Curie temperatures are found to be 781 and 721 K for Fe2-Sr(W) and Fe-Sr(X) systems, respectively. The saturation magnetization of a Zn2-Sr(W) hexaferrite has been observed to be maximum at 5 and 300 K among all the samples investigated, namely, 115 and 82 emu/g. The saturation magnetization of Fe2-Sr(W) and Fe-Sr(X) hexaferrites are almost the same, whereas at 300 K this value is higher for Fe2-Sr(W). The coercivity of the Fe-Sr(X) sample has been found to be higher than the Fe2-Sr(W) hexaferrite after 8 h of milling.