Patent ID: 8415774
Filing Date: 2013-04-09
Classification: G06K,H01L

Abstract:
1. A protected electrical device having at least one electrical sub-assembly to be protected, the electrical device having an upper surface, a lower surface and electrical connections for external interaction, characterized in that it further comprises on at least one of the upper and lower surfaces at least a screening layer against the electromagnetic (EM) and radiofrequency (RF) fields emitted by said electrical sub-assembly, said screening layer comprising at least a first layer made of soft magnetic material with a high relative permeability (μ said screening layer further comprising an additional outer layer deposited on the first layer, said additional outer layer being a mechanically hard layer exhibiting a good resistance to mechanical polishing or chemical etching, said screening layer being placed on substantially the whole surface of said at least one of the upper and lower surfaces, except on predetermined regions of limited area, said electrical connections with external devices being located on at least some of said predetermined regions, and wherein the screening layer further comprises a seed layer of Ti or oxide disposed between the electrical sub-assembly and said first layer, and said seed layer has a thickness between 8 and 100 nm.