Patent ID: 7442263

Claim:
A transductor choke for a high frequency application comprising a magnetic core made from a nanocrystalline alloy, wherein the nanocrystalline alloy consists essentially of Fe a Co b Cu c M′ d Si x B y M″ z , wherein M′ signifies an element from the group V, Nb, Ta, Ti, Mo, W, Zr, Hf, or a combination thereof, and wherein M″ signifies an element from group C, P, Ge, As, Sb, In, O, N or a combination thereof, wherein the following conditions shall apply: a+b+c+d+x+y+z=100%, with a=100%−b−c−d−x−y−z; 0≦b≦15; 0.5≦c≦2; 0.1≦d≦6; 2≦x≦20; 2≦y≦18; 0≦z≦10 and x+y>18; and wherein the magnetic core has a hysteresis loop which is as rectangular as possible, a saturation magnetostriction |λ s |<3 ppm, and an effective roughness R a (eff) ranging from 3 to 9%.