Bifilar layer-insulated magnetic core and method for the production of a wound nanocrystalline magnetic core

A method for the production of a wound nanocrystalline magnetic core comprising:

• providing a nanocrystalline metal strip consisting of
• (Fe1-aMa)100-x-y-z-α-βCuxSiyBzM′αXβ,
• where
• 0≤a≤0.4,
• 0.1 at. % ≤x≤3 at. %,
• 0 at. % ≤y≤30 at. %,
• 0 at. % ≤z≤25 at. %,
• 0.1 at. % ≤α≤30 at. %,
• β≤5 at. %,
• M is Co and/or Ni,
• M′ is one or more elements from the group consisting of V, Nb, Ta, Mo, W, Zr, Hf, Ti, Cr and Mn,
• X is one or more from the group consisting of C, Ge and P, including less than 2 at. % of customary impurities, the metal strip being pre-wound to form a coil, providing an insulating foil that is coated on at least one side with an adhesive, applying the adhesive to the nanocrystalline metal strip to laminate the insulating foil onto the metal strip and to stabilise the metal strip as it is wound off the coil, bifilar winding the laminated nanocrystalline metal strip and the insulating foil to form a bifilar, layer-insulated coil.