| 摘要 |
Particulate product containing at least 75 weight % iron (total iron content) and at least 25 weight % acicular alpha -iron metal, process for making said product and magnetic recording medium having said product incorporated therein, said product having a length less than 1 micron ( mu ), a length to diameter ratio of at least about 10:1, a coercivity (iHc), of greater than about 800 oersteds, a saturation magnetization ( sigma s) of at least 110 electromagnetic units/gram (emu/g), a residual (remanent) magnetization ( sigma r) of at least 50 emu/g, and a ratio ( sigma r/ sigma s) of residual (remanent) magnetization ( sigma r) to saturation magnetization of at least about 0.45.
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