Circumventing Magnetic Reciprocity: a Diode for Magnetic Fields
Abstract
Lorentz reciprocity establishes a stringent relation between electromagnetic fields and their sources. For static magnetic fields, a relation between magnetic sources and fields can be drawn in analogy to the Green's reciprocity principle for electrostatics. Here we theoretically and experimentally show that a linear and isotropic electrically conductive material moving with constant velocity is able to circumvent the magnetic reciprocity principle and realize a diode for magnetic fields. This result is demonstrated by measuring an extremely asymmetric magnetic coupling between two coils that are located near a moving conductor. The possibility to generate controlled unidirectional magnetic couplings breaks down one of the most deeply-established relations in classical electromagnetism, namely that mutual inductances are symmetric. This result might provide novel possibilities for applications and technologies based on magnetically coupled elements.
Cite
@article{arxiv.1802.00832,
title = {Circumventing Magnetic Reciprocity: a Diode for Magnetic Fields},
author = {J. Prat-Camps and P. Maurer and G. Kirchmair and O. Romero-Isart},
journal= {arXiv preprint arXiv:1802.00832},
year = {2018}
}
Comments
main text: 5 pages, 3 figures; supplemental material: 15 pages, 4 figures, 1 table