Soft magnetic powder, dust core, magnetic element, and electronic device

The invention relates to a soft magnetic powder, a powder magnetic core, a magnetic element and an electronic device, and provides the soft magnetic powder capable of manufacturing a powder compact with small iron loss, the powder magnetic core and the magnetic element with good soft magnetic characteristics, and the electronic device with the magnetic element and high reliability. The soft magnetic powder is characterized by comprising FexCuaNbb (Si1-yBy) 100-x-a-b [wherein a, b, and x are numbers satisfying, in atomic%, 0.3 < = a < = 2.0, 2.0 < = b < = 4.0, and 73.0 < = x < = 79.5, respectively. And y is a number satisfying f (x) < = y < 0.99. In addition, f (x) = (4 * 10 ) x 17.56. ], and contains 30 vol% or more of a crystal structure having a particle diameter of 1.0 nm or more and 30.0 nm or less. 本发明涉及一种软磁粉、压粉磁芯、磁性元件以及电子设备，并提供能够制造铁损小的压粉体的软磁粉、软磁性特性良好的压粉磁芯以及磁性元件、以及具备该磁性元件的可靠性高的电子设备。软磁粉的特征在于，包括以FexCuaNbb(Si1-yBy)100-x-a-b[其中，a、b以及x为满足分别以原子％计的0.3≤a≤2.0、2.0≤b≤4.0以及73.0≤x≤79.5的数。并且，y为满足f(x)≤y＜0.99的数。此外