Abstract
Low temperature magnetic properties of (Zn–Sn) substituted barium hexaferrite nano-particles (BaFe 12−2 x Zn x Sn x O 19) from 78 to 293 K have been measured to study the substitution effects on their temperature dependence characteristics. It was found that suitable amount of substitution could increase the saturation magnetization M s, which became obvious only at temperatures lower than 293 K. Different from other types of dopant-combinations, BaFe 12−2 x Zn x Sn x O 19 particles showed a small positive temperature coefficient of coercivity in this temperature range. This coefficient decreased with the increase of substitution concentration x from about 3.7 Oe/K ( x=0) to 1.9 Oe/K ( x=1.1). The anisotropy constant K 1 of these particles increased linearly with the decrease of temperature.
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