| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an iron-nitride magnetic powder of which aging degradation of magnetism is suppressed and which is highly reliable. <P>SOLUTION: The iron-nitride magnetic powder is made mainly of Fe<SB>16</SB>N<SB>2</SB>containing at least more than one kind of element among V, Sc, Ti, Cr, and Mn at 1% or higher atomic ratio to Fe. Especially, it is made mainly of Fe<SB>16</SB>N<SB>2</SB>wherein ΔHc defined by a formula (1) is 10% or less and Δσs defined by a formula (2) is 20% or less. Formula (1): ΔHc=(Hc<SB>0</SB>-Hc<SB>1</SB>)/Hc<SB>0</SB>×100; formula (2): Δσs=(σs<SB>0</SB>-σs<SB>1</SB>)/σs<SB>0</SB>×100. In these formula, Hc<SB>1</SB>and σs<SB>1</SB>represent coercive force and saturation magnetization of the magnetic powder, respectively, after the magnetic powder is held at 60°C and 90%RH for one week, and Hc<SB>0</SB>and σs<SB>0</SB>represent coercive force and saturation magnetization thereof, respectively, before it is held at constant temperature and humidity. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
