The authors varied the composition of Sr1-xLaxFe12-xCoxO19sintered ferrite magnets (x=0-0.4) for analyzing the effects of various factors on the temperature variation of coercivity (HcJ) in the temperature range between 173 and 423 K, wherexis the substituted amount. The effects of the crystal grain size (Ct), the mechanism of magnetization reversal (Rh), the degree of crystal grain orientation (OD), and the anisotropy field (HA) on the temperature variation ofHcJwere also examined. It was confirmed that the equationHcJ=Ct(0.4/Rh) OD (HA-Hd-Hin) was applicable for expressing the measuredHcJin a wide temperature range between 173 and 423 K for all the magnets, whereHdandHinare the demagnetizing field of shape anisotropy and the interaction field between crystal grains, respectively. Above all, the factors ofCt,Rh, andHAhad significant effects on the temperature variation ofHcJfor all the magnets.
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Nishio et al. (2011) studied this question.
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