Alloy and method of making a magnetic core

摘要

An alloy is provided which is characterized by the formula FeCoNiCuMSiBX, where M is at least one of V, Nb, Ta, Ti, Mo, W, Zr, Cr, Mn and Hf, a, b, c, d, e, f , g are given in atomic percent, X denotes impurities and the optional elements P, Ge and C and a, b, c, d, e, f, g, h meet the following conditions: where a + b + c + d + e + f + g = 100.The alloy has a nanocrystalline structure in which at least 50% by volume of the grains have an average size of less than 100 nm, a saturation magnetostriction | λ | ≤ 1 ppm, preferably | λ | ≤ 0.5 ppm, a hysteresis loop with a central linear part, and a permeability of 10,000 to 15,000, preferably 10,000 to 12,000.