A magnetic powder composed primarily of Fe that has been surface-treated with a silane coupling agent, which magnetic powder is characterized in that it contains Co such that Co/Fe expressed in atomic percent is 20-50 at. %, Al such that Al/Fe expressed in atomic percent is 5-30 at. %, and one or more rare earth elements R (including Y) such that R/Fe expressed in atomic percent is 4-20 at. %, and has average particle diameter of smaller than 80 nm, TAP density of 0.7 g/cm3 or greater, ignition point of 165° C. or higher, and oxygen content of 26 wt % or less.
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机译：一种主要由Fe构成的磁粉，该磁粉已经用硅烷偶联剂进行了表面处理，其特征在于它含有Co，以原子百分数表示的Co / Fe为20〜50at。 Al，使得以原子百分比表示的Al / Fe为5-30at。 ％和一个或多个稀土元素R（包括Y），使得以原子百分比表示的R / Fe为4-20at。 ％，平均粒径小于80 nm，TAP密度为0.7 g / cm 3 或更高，着火点为165°C或更高，氧含量为26 wt％或更低。
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