Wound magnetic core, alloy core, and method for manufacturing wound magnetic core

A wound magnetic core of a nanocrystalline soft magnetic alloy ribbon,

• wherein the wound magnetic core has a non-circular shape, and an impedance relative magnetic permeability μrz at 100 kHz of the wound magnetic core is 45000 or more;
• and wherein the wound magnetic core has no portion where the nanocrystalline soft magnetic alloy ribbon is spaced apart by 0.1t or more from a nanocrystalline soft magnetic alloy ribbon that is adjacent thereto in a stacking direction, wherein t is a thickness of the wound magnetic core in the stacking direction, and
• wherein the nanocrystalline soft magnetic alloy ribbon has a composition represented by (Fe1-aMa)100-x-y-z-α-β-γCuxSiyBzM′αM″βXγ (atom %),
• where M is at least one element selected from Co and Ni, M′ is at least one element selected from Nb, Mo, Ta, Ti, Zr, Hf, V, Cr, Mn and W, M″ is at least one element selected from Al, platinum group elements, Sc, rare earth elements, Zn, Sn and Re, and X is at least one element selected from C, Ge, P, Ga, Sb, In, Be and As,
• a, x, y, z, α, β and γ, which define the composition ratio, can satisfy the following relationships;
• 0≤a<0.5,
• 0.1≤x≤3,
• 10≤y≤20,
• 5≤z≤10,
• 0.1≤α≤5,
• 0≤β≤10, and
• 0≤γ≤10.