Alternative circuit engineering

2019: Scientists of MIPT found out how not to lose a signal in magnon schemes

On December 3, 2019 it became known that researchers from Moscow Institute of Physics and Technology, Institute of radio engineering and electronics of V.A. Kotelnikov RAS and Saratov State University showed that connecting elements in electronic circuits of magnon logic are very important: the unsuccessful wave guide can lead to signal loss. Scientists constructed parametrical model which allows to model the suitable wave guide which is not leading to signal loss created a prototype of a wave guide and checked experimentally correctness of model. Article is published in Journal of Applied Physics.

The global task of the researchers who are engaged in magnon logic is a creation of the alternative circuit engineering compatible to the existing electronics. So it is necessary to make so that it was possible to add essentially new elements to the available devices. For example, more high-speed processors with low power consumption.

At design of new devices it is necessary to connect different elements with each other, as well as in normal circuit engineering. But in magnon instead of wires magnetic wave guides are used. Earlier assumed that wave guides can influence a little decrease in intensity at signal transmission from an element to an element.

Researchers from MIPT, IRE and SGU showed that influence of connecting elements is more significant. If not to guess with geometry parameters, all signal can be lost. The basic reason of it is an interference of spin waves. Wave guides very small — about tens of nanometers, in such scales it is necessary to consider quantum properties of a signal.

Scientists solved an optimization problem: how to construct the most effective wave guide for devices of magnon logic. They created the theory and a mathematical model describing distribution of waves in nanodimensional wave guides. For this purpose Dmitry Kalyabin, the executive in charge of laboratory of terahertz spintronics of MIPT, adapted the practices which were earlier existing in collective for acoustics on a case of magnetic waves.

His colleagues from Saratov managed to create a prototype and using Brillouin spectroscopy to show that calculations of the Moscow researcher were right.

"Initially we assumed to construct model on which it is possible to count throughput characteristics of a wave guide before its creation. We thought that optimization of a form of a wave guide will improve signal transmission efficiency. And during the research it turned out that influence of an interference is more significant: if parameters are unsuccessful, the signal can not be transmitted at all", 'Sergey Nikitov, the corresponding member of RAS, the head of the laboratory of terahertz spintronics of MIPT noted'

MIPT noted that though researchers showed work of model on the example of a direct case, it can be applied also to the description of all range of the existing wave guides.