Hiding objects in AC magnetic fields of power grid frequency by two-shell ferromagnetic/superconducting cloak
Applied Physics Letters, ISSN: 0003-6951, Vol: 109, Issue: 3
2016
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Article Description
Performance of magnetic cloak made from commercially available materials has been tested by verifying its ability to suppress the magnetic signatures of metallic and ferromagnetic objects. The range of magnetic field amplitudes from 0.1 to 10 mT and frequencies around 50-60 Hz were used. The cloak combines the inner tube from high-temperature superconductor that should be cooled by liquid nitrogen, with the outer tube made from MnZn ferrite powder mixed in plastic matter. Superconductor is in the form of tapes wound in helical manner on a round former. Such design is promising when the objects with dimensions reaching several centimeters should be cloaked. Performance of the small model manufactured following this design was demonstrated by observing ∼20 times reduction of the magnetic signature of metallic or ferromagnetic objects.
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