preparing a magnetic core pattern on a copper-coated plastic plate;

operationally attaching the copper-coated plastic plate to a host plate;

operationally attaching the host plate to a passing device configured to pass the copper-coated plastic plate directly through a metal plating bath and an imperfect insulation layer deposit environment repeatedly;

forming layers of a magnetic core containing at least one magnetic layer and at least one imperfect insulation layer, where the imperfect insulation layer is an oxide layer that imperfectly or incompletely coats the underlaying metal layer, to allow for contact between the metal layers through the imperfections, by passing the copper-coated plastic plate directly through the metal plating bath, the imperfect insulation layer plating environment, and the imperfect insulation layer deposition environment in series until the core is complete.