|An international team of scientists developed a new technology to transfer magnetic fields to arbitrary long distances, which is comparable to transmitting and routing light in optical fibers. Oriol Romero-Isart and his colleagues theoretically proposed and tested this new device experimentally. The field of possible applications is broad and includes spintronic and quantum computers among others. The work of the physicists from the Universitat Autonoma de Barcelona (UAB), the Max-Planck-Institute of Quantum Optics, the Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences and the Institute for Theoretical Physics of the University of Innsbruck has been published in the renowned journal Physical Review Letters.
They used a ferromagnetic cylinder made of cobalt and ion and wrapped it with a high-temperature superconductor shell. “Superconductors are perfect magnetic insulators,” explains Romero-Isart. The researcher’s calculations showed that a structure of alternated superconducting and soft ferromagnetic concentric cylindrical layers could transfer more than 90% of the magnetic field to any distance. Remarkably, the researchers also calculated that up to 75 % of the magnetic field can be transferred by using only a bilayer scheme – a ferromagnetic core with a superconducting outer layer. This new method could be used, for example, for future quantum technology coupling distant quantum systems magnetically, applications in spintronics and other nano technologies.