Patent ID: 7847668

Claim:
An inductor comprising: a substrate; an insulator layer disposed on said substrate; a conductive coil embedded in said insulator layer; and a permeability-enhancing film of a multi-layer structure disposed on a selected one of said substrate and said insulator layer; wherein said multi-layer structure includes at least one repeating unit that is a bi-layer structure having two layers; wherein said two layers exhibit an exchange-coupling effect and include a first ferromagnetic layer of a first ferromagnetic material and an exchange-coupling layer magnetically coupled to said first ferromagnetic layer; and wherein said first ferromagnetic material of said first ferromagnetic layer of said bi-layer structure has a permeability greater than 10 under a frequency ranging from 0.1 MHz to 10 GHz, and the material of said exchange-coupling layer of said bi-layer structure is capable of enhancing an anisotropy field of said first ferromagnetic material of said first ferromagnetic layer of said bi-layer structure in a magnitude greater than 10%.