SOFT MAGNETIC POWDER, POWDER MAGNETIC CORE, MAGNETIC ELEMENT AND ELECTRONIC APPARATUS

To provide a soft magnetic powder balancing low coercive force and high saturated magnetic flux density, a powder magnetic core and a magnetic element comprising the soft magnetic powder, and an electronic apparatus capable of miniaturization and high output.SOLUTION: A soft magnetic powder comprises grains each having a composition expressed by FexCuaNbb(Si1-yBy)100-x-a-b [a, b, x denote numbers in which each unit is atom%, and 0.3≤a≤2.0, 2.0≤b≤4.0, 75.5≤x≤79.5 are satisfied. Further, y denotes a number satisfying f(x)≤y≤0.99, and f(x)=(4×10-34)x17.56.] The grains comprise: crystal grains each having a grain size of 1.0 or more to 30.0 nm or less and including Fe-Si crystals; Cu segregation parts having a grain size of 2.0 nm or more to 16.0 nm or less and in which Cu is segregated; and crystal grain boundaries adjacent to the crystal grains and having an Nb concentration and a B concentration higher than the crystal grains, and the number ratio of the Cu segregation parts is 80% or more.SELECTED DRAWING: Figure 1 【課題】低い保磁力と高い飽和磁束密度とを両立する軟磁性粉末、かかる軟磁性粉末を含む圧粉磁心および磁性素子、ならびに、小型化および高出力化が可能な電子機器を提供すること。【解決手段】ＦｅｘＣｕａＮｂｂ（Ｓｉ１－ｙＢｙ）１００－ｘ－ａ－ｂ［ａ、ｂ、ｘは、それぞれ単位が原子％である数であって、０．３≦ａ≦２．０、２．０≦ｂ≦４．０、７５．５≦ｘ≦７９．５、を満たす。また、ｙは、ｆ（ｘ）≦ｙ≦０．９９を満たす数であって、ｆ（ｘ）＝（４×１０－３４）ｘ１７．５６である。］で表される組成を有する粒子を含み、粒子は、粒径１．０ｎｍ以上３０．０ｎｍ以下であり、Ｆｅ－Ｓｉ結晶を含む結晶粒と、粒径２．０ｎｍ以上１６．０ｎｍ以下であり、Ｃｕが偏析しているＣｕ偏析部と、結晶粒に隣接し、結晶粒よりもＮｂ濃度およびＢ濃度が高い結晶粒界と、を有し、Ｃｕ偏析部の個数比率が８０％以上であることを特徴とする軟磁性粉末。【選択図】図１