The new science spinthric about the effects associated with the transfer of the spin of charge particles allows you to create not only promising magnetoretive memory, but also promises a breakthrough in the production of electricity from the “trash” radio frequency radiation. Today, the cities are oversaturated with all sorts of frequencies whose energy in the overwhelming majority is dissipated without use. Extra electricity from it is a tempting goal.
Researchers from the National University of Singapore (NUS) and the Japanese University of Tohok (TU) created an array of 50 so-called spin-transfers oscillators (generators) on a crystal. Each of the tiny generators consisted of a whole cascade of thin layers of dielectric and magnetic materials. The same materials, but in a smaller number are used to produce STT-MRAM memory.
In these materials, under the influence of an external magnetic field – radio frequency radiation – auto-oscillations arise with the generation of a spin of polarized current. A consistent or parallel connection of several dozen such generators allows you to get a sufficiently high current to charge the capacitor and stuff a simple electronics.
Created by scientists Chip for the extraction of electricity from radiation with a frequency of 2.4 GHz is one of the most common carrier signals Wi-Fi – in five seconds charged the capacitor in the diagram and then for about a minute he kept lit LED with a supply voltage of 1.6 V. in theory, And scientists will achieve this in experiments, you can create a working diagram with charging battery from Wi-Fi signal with subsequent autonomous power in the simplest internet of things.
To create a working circuit from an array of extractive oscillators, researchers had to solve a lot of problems, including synchronization of oscillators and compensation for their impact on each other. The spinal effects are so thin that physics of processes includes the occurrence and mutual influence of magnetic vortices in materials in separate oscillators. Therefore, synchronization includes both temporary and spatial factors. Simply put, even the geometry of the placement of generators on the crystal is influenced by the production of electricity, as well as significantly different generation modes with a sequential and parallel inclusion of oscillators.
In detail about the study, you can read in the article in Nature Communications. The article is freely available by reference.