2015•Bulletin of the Lebedev Physics InstituteRequires access
Electromagnetic shields based on multilayer film structures
Valery V. Dmitrenko, Phyo Wai Nyunt, Konstantin F. Vlasik, Viktor M. Grachev, Sergey S. Grabchikov, S. S. Muravyev-Smirnov, Alexander S. Novikov, Sergey E. Ulin, Ziyaetdin M. Uteshev, Irina V. Chernysheva, Alexander E. Shustov
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Abstract
Electrodeposited multilayer-film electromagnetic shields are very promising for protecting various devices due to high shielding efficiency and the possibility of depositing on complex-shaped objects. In this communication, we present the results of measurements of the shielding efficiency of such shields. The shields represent alternating layers of materials with high magnetic permeability (Ni-Fe) and high conductivity (Cu). The maximum number of double layers is 45. It is shown that the shielding efficiency in the weak magnetic fields (0.1–0.2 mT) is 8–10; at higher magnetic field strengths (1.5–2.5 mT), it reaches 80–100. It is shown that the shielding factor increases with the number of layers in the shield at the same thickness of a soft magnetic material. A permalloy shield at the same amount of a soft magnetic material has an efficiency lower by a factor of 3–15 depending on the magnetic field strength.