Resumen
Magnetic signature system for authentication of documents based on the use of magnetic rings of nanometric or micrometric magnetic strings arranged perpendicular to the surface of the document to be authenticated and embedded in a non-conductive porous membrane. To characterize the wires, a variable magnetic field is generated and the magnetization of the wires is detected, for example by means of the electromotive force (f.e.m.) induced in a loop located parallel to the document. The threads allow defining a large number of signatures because they can be manufactured by layers of different materials, magnetic, non-magnetic and alloys, and the cycles depend on the materials and the dimensions of each layer. Different cycles can also be obtained by modifying the direction of easy magnetization of the magnetic material. In addition, the arrangement perpendicular to the document increases the surface density of threads, facilitates magnetization in this direction and detection with the aforementioned system. (Machine-translation by Google Translate, not legally binding)