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Acicular T-Fe20 particles surface coated with barium ferrite fBF) have been prepared by reacting acicular U-FeOOH and the surface adsorbed Ba++ at 810 to 89OoC followed by reduction-oxidation. has a diameter of 100 to 2 0 0 nm and aspecz ratio of 3 to 8, a coercivity of 330 to 3600 Oe, a saturation and residual magnetization of 47 to 70 and 23 to 34 emulg, respectively, by controlling the Ba++ concentration and heat treatment temperatures. They have an extremely low temperature coefficient of coercivity of -0.07 to -0.1 %/OC. These particles are potentially useful for high density recording purposes.The BF coated r-Fe20

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