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Fe or Ni–Fe Alloy Coated Barium Ferrite Particles

Barium ferrite (BaFt) particles with Fe coating or Ni–Fe alloy coating were prepared. To prepare the Fe coating, the BaFt particles (with irregular shapes), about 900 nm in size, were directly reduced in a stream of hydrogen (at 1 atm). For the Ni–Fe alloy coating, the BaFt hexagonal platelets, 200–500 nm in size, were dipped into a solution with a [Ni2+]/[Fe3+] molar ratio of 1/10, hydroxided by dripping 2 N NaOH solution onto the BaFt particles, and finally reduced in a stream of hydrogen (at 1 atm). The results showed that the coercivity of BaFt particles could be reduced significantly, while their saturation magnetizations were maintained at high levels. With the Fe coating, the saturation magnetization of the BaFt particles remained at about 63 emu/g, being comparable with that of pure BaFt particles, 70 emu/g. With the Ni–Fe alloy coating, the saturation magnetization of the BaFt particles was even higher than that of the pure BaFt particles. Analytical calculations using micromagnetics were successful in explaining the effect of the Ni–Fe coating on the coercivity of coated BaFt particles. It was found that both surface reduction of BaFt and Ni–Fe alloy coating contribute to coercivity decrement and magnetization increment.