Sounds interesting but it should be treated with care without a more full description. There are 'one way' EN devices in RF Engineering (Circulators and Isolators) which force EM waves to 'go one way' but they involve dissipative elements and non-linearity.CWatters said:Couldn't see this news posted elsewhere. Sound too good to be true?...
Quote: "We have created a device that behaves like a diode for magnetic fields."
https://phys.org/news/2018-11-defy-19th-century-law-physics.html
I haven't read their paper yet.
Unidirectional magnetic coupling is a phenomenon where two magnetic materials interact in a way that one material can influence the other's magnetic field, but not vice versa. This means that the magnetic field of one material can only flow in one direction, hence the term "unidirectional".
Unidirectional magnetic coupling works through the alignment of magnetic moments in the two materials. When the magnetic moments are aligned in the same direction, they can interact and influence each other's magnetic fields. However, when the magnetic moments are aligned in opposite directions, they cancel each other out and do not interact.
Unidirectional magnetic coupling is commonly used in various technologies, such as in magnetic recording devices (e.g. hard drives), magnetic sensors, and in wireless power transfer systems. It is also used in magnetic bearings and motors to prevent unwanted backflow of magnetic fields.
Unidirectional magnetic coupling only allows for magnetic fields to flow in one direction, while bidirectional magnetic coupling allows for magnetic fields to flow in both directions. This means that bidirectional coupling allows for more complex interactions between the magnetic materials, but it also requires more energy to maintain the magnetic fields in both directions.
The strength of unidirectional magnetic coupling can be affected by factors such as the alignment and strength of the magnetic moments in the materials, the distance between the materials, and the presence of any external magnetic fields. The type of materials used and their properties, such as permeability and coercivity, can also impact the strength of unidirectional magnetic coupling.