Patent ID: 8450830

Claim:
A laminated ferromagnetic alloy core for micro-fabricated high frequency inductors and transformers comprising: a substrate, having a top and bottom surface; a non-removable photoresist layer formed on the substrate, the photoresist layer having a plurality of spaced apart vias formed therein, exposing the top surface of the substrate; for each via, a plurality of contiguous laminations formed therein, each lamination including a conductive seed material layer and a ferromagnetic material layer, having a thickness, formed on the conductive seed material layer; wherein the thickness of each ferromagnetic material layer is configured to minimize the eddy current losses at a given frequency of operation; wherein each lamination includes a seam inside the lamination, configured in width so that further processing will not be limited by the aspect ratio; the contiguous laminations having a dielectric layer formed therebetween; wherein the number of contiguous laminations and the thickness of each lamination are configured to provide a sufficient volume of magnetic material to support high frequency applications and to reduce eddy current loss at high frequency respectively.