Room-temperature broadband quasistatic magnetic cloak
2017 (English)In: NPG ASIA MATERIALS, ISSN 1884-4049, Vol. 9, e341Article in journal (Refereed) Published
In the past decade, invisible cloaks have experienced rapid research development in the metamaterial community driven by their revolutionary practical potentials. Among them, magnetic cloaks, which are able to conceal metallic or magnetic objects from electromagnetic induction detection, have attracted a great amount of attention. However, applications of these reported devices are limited by their low-temperature environment requirement because of the involvement of superconductors to acquire the perfect diamagnetic response. In this work, we remove this temperature hurdle by fully taking the diamagnetic features of usual metals and demonstrate a three-dimensional room temperature quasistatic magnetic cloak using a ferromagnetic metallic bilayer structure. Experimentally, our device exhibits a prominent cloaking effect in a wide frequency range from 5 to 250 kHz with a maximum field disturbance ratio < 0.5%. The practical potential is verified through a commercial handheld metal probe working at 25 kHz. Our results unambiguously show that an invisible cloak may be realized in the low-frequency region for scenarios where screening an external magnetic field without disturbance is specifically demanded.
Place, publisher, year, edition, pages
Nature Publishing Group, 2017. Vol. 9, e341
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-204129DOI: 10.1038/am.2016.197ISI: 000393795000002OAI: oai:DiVA.org:kth-204129DiVA: diva2:1085172
QC 201703282017-03-282017-03-282017-03-28Bibliographically approved