In collaborative research out of Japan and Switzerland, scientists have taken an important step towards a next generation of analog computers by creating new types of logic gates based on spin waves. Spin waves are the waves generated when all the electrons in a system shift the alignment of their spins in one direction and at the same time.
âBoth practically and in terms of research, thereâs a higher potential to achieve analog computing more affordably using spin-wave technology compared to other wave-based approaches.â âTaichi Goto, Tohoku University
When reconsidering the promise of analog computersâfor new kinds of super-efficient AI and new directions in conventional computing, for instance, that avoid analog-to-digital conversionsâresearchers often lean on optical wavelengths of light for governing an analog logic circuit. Optics are a natural choice for wave-based computing, as light waves are easily manipulable and easily read off once a computation is done.
On the other hand, optical analog computers can also be bulky and vulnerable to imperfections in optical components, generating errors in the computation that can quickly snowball.
Spin wave analog computing
Meanwhile, spin waves have wavelengths of around 100 nanometers and offer a different vision for analog computing more aligned to the predominantly electronic world of digital computers.
The spin wave researchersârelying not on optics but on âmagnonicsâ to control these wavesâ have developed a new kind of waveguide that could provide the basis for a spin-wave computerâs logic gates.
âBoth practically and in terms of research, thereâs a higher potential to achieve analog computing more affordably using spin-wave technology compared to other wave-based approaches,â says Taichi Goto, associate professor from Tohoku Universityâs Research Institute of Electrical Communication and co-author of the study.
Goto says that the better affordability of their spin-wave technology stems from its ability to operate at room temperature. While some magnetic materials may require cooling, the material the researchers developed can operate at room temperature.
âThereâs no need for cooling facilities or running costs akin to those needed for quantum computers using superconductors,â says Goto.
Goto says the researchers devoted much energy and effort developing their spin-wave waveguide, which would provides the foundation for analog logic gates and other essential components of any analog computer. Typically, such magnonic waveguides are produced by processing yttrium-iron-garnet (YIG) into rod-like shapes. Then, by adding hexagonally-latticed, two-dimensional (2D) copper to an YIG substrate, Goto says, they increased the waveguideâs internal reflectivity, thereby reducing losses within the waveguide.
In the device, spin waves are generated by an antenna, constructed directly on the insulating substrate. The hexagonally latticed 2D copper then can reflect and channel these same spin waves.
The wavelength of spin waves can be easily altered by the antennaâs size and structure, Goto says, making it easier to control properties like wave phase interference, refraction, diffraction, and localization. This fundamental property allows for the creation of unique functionalities that are challenging to replicate elsewhere, Goto adds.
Next, to generate and refine the logic gates, Goto says, the researchers are considering further developments in fabrication of the 2D copper material.
âWe believe that functions exclusive to spin-wave circuit chips will open up new, albeit not yet extensive, markets,â Goto says.
The researchers published their work last month in the journal Physical Review Applied.
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Wanda Parisien is a computing expert who navigates the vast landscape of hardware and software. With a focus on computer technology, software development, and industry trends, Wanda delivers informative content, tutorials, and analyses to keep readers updated on the latest in the world of computing.