See ArXiv preprint, also Magnetic field diode is a first, say physicists Engineers have long sought a comparable device that would direct magnetic fields in only one direction – something that would be incredibly useful in many technologies. Until now, however, the Lorentz reciprocity principle has been a formidable barrier to creating a practical magnetic field diode.
The principle states that when a magnetic field source, such as a conducting wire coil, induces a field in a second source, the second will be able to induce a field in the first. Therefore, a magnetic field diode in which the field can only be transferred coil-to-coil in one direction should not be possible.
Illustration of the diode coils set within the U-shaped groove in the wall of the rotating cylinder. The cylinder is rotating to the right, which prevents the magnetic field from being transmitted to the left.
Prat-Camps and colleagues identified a special situation where the symmetry dictated by the reciprocity principle can be broken. They found that this could be achieved if the two coils were placed within the walls of a hollow, conducting cylinder rotating at a constant velocity. The team then built a cylinder with walls that have a U-shaped groove containing the coils (see figure) and demonstrated its practicality in the lab.
This device makes possible to transfer the magnetic field from a first magnetic element. When roles are inverted, and one tries to send magnetic field from the second to the first, no magnetic field is transferred. When the conductor is properly placed near to the magnetic elements and is moved at the right speed, the coupling between them becomes unidirectional, and a diode for magnetic fields is realized.
Many overunity and antigravity devices utilize magnetic monopole compartment - their common idea is, quantum fluctuations of vacuum induce magnetic field which can get rectified into a permanent current by low-dimensional arrangement. The slowing of EM wave is crucial for various antigravity and overunity scenarios: in my theory the overunity is possible, once the energy density of physical system changes faster than the speed of energy propagation within it.
Under such a situation the EM wave could effectively propagate faster than it should do in material given. This condition is also necessary for entropic time reversal, formation of magnetic monopoles, time crystals, antigravity thrusters violating inertia law etc (due to correspondence principle the violation of one fundamental law violates also many others related ones.) The propagation of electromagnetic waves along bifilar coils or within saturated ferromagnets comes on mind here.