INITIAL ULTRAFINE CRYSTAL ALLOY, NANOCRYSTAL SOFT MAGNETIC ALLOY AND METHOD FOR PRODUCING SAME, AND MAGNETIC COMPONENT FORMED FROM NANOCRYSTAL SOFT MAGNETIC ALLOY

摘要

Disclosed is an initial ultrafine crystal alloy having a composition represented by the general formula Fe_100-x-y-zA_xB_yX_z. (In the formula, A is Cu and/or Au; X is at least one element selected from Si, S, C, P, Al, Ge, Ga and Be; x, y, and z are numbers that satisfy the conditions 0 x ≤5, 10 ≤y ≤22, 0 ≤z ≤10, and x + y + z ≤25 in atomic percent.) The structure is one in which initial ultrafine crystal particles with an average particle diameter of 30 nm or less are dispersed in a proportion of 5 - 30 vol% in a noncrystalline parent phase. The differential scanning calorimetry (DSC) curve has a first exothermic peak and a second exothermic peak smaller than the first exothermic peak between the crystallization starting temperature T_X1 and a compound deposition temperature T_X3. The proportion of the gross heating value for the second exothermic peak to the gross heating value for the first exothermic peak and the second exothermic peak is 3% or less.