Highlights

Above

Communication over long distances can be made faster with artificial spin ice systems.

© Piqsels

Putting a new spin on communications

17 Apr 2020

A*STAR researchers are studying magnetic nanostructures which could give long-distance communications a speed boost.

“To boldly go where no man has gone before” is the famous mission of the starship Enterprise in Star Trek. However, in reality, our ambition to explore uncharted regions in space is hampered by many obstacles, such as our communication capabilities, which still suffer from delays when transmitting and receiving information over great distances. For example, a message sent from Mars takes about 13 minutes to reach Earth, hardly an ideal situation in emergencies.

In the quest to improve ultrafast communications, researchers at A*STAR’s Institute of Materials Research and Engineering (IMRE), who were previously working at Data Storage Institute (DSI), are tapping on spin wave-mediated communication based on ultrathin magnets.

Using sophisticated lithography processes, the researchers were able to create a specific class of metamaterials called magnonic crystals. In the present study, the researchers used a unique type of magnonic crystal that possesses magnetic monopole-like behavior, a property that does not exist in nature. The resulting structures are known as artificial spin ice (ASI) systems, named after the distinctive arrangement of water molecules ice, where each oxygen atom is surrounded by four neighboring hydrogen atoms in space.

“ASI systems are attractive due to their unique static and dynamic features. For application purposes, control and tuning their characteristics will be essential,” said Abhijit Ghosh, Scientist at IMRE. “Our high-frequency dynamics study of ASI systems and other types of magnonic crystals are aimed at unveiling the prospects of such structures for ultrafast futuristic communications.”

Using experimental techniques like high-frequency ferromagnetic resonance spectroscopy in combination with micromagnetic simulations and semi-analytical techniques, Ghosh and his team found that the geometrical parameters of the nanostructured magnets strongly influence their high-frequency (microwave) characteristics.

The team then explored how introducing different geometrical parameters—generated through nanofabrication—influenced the magnetic properties of their ASI system. They showed that manipulating the dimensions of the magnonic crystals and the thickness of the magnetic layers could enable scientists to design ASI systems for specific functions.

In the future, ASI systems could be useful in diverse and intriguing applications beyond communications, such as neuromorphic computing for developing artificial intelligence and enhancing our data storage capabilities, added Ghosh.

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References

Ghosh, A., Ma, F., Lourembam, J., Jin, X., Maddu, R. et al. Emergent Dynamics of Artificial Spin-Ice Lattice Based on an Ultrathin Ferromagnet. Nano Letters 20: 109-115. (2020) | article

About the Researcher

Abhijit Ghosh received his PhD from Spintec Laboratory, Grenoble, France in 2012, where he worked on spin current transport in metallic spintronic systems. Later, he joined ETH Zurich, Switzerland for post-doctoral research in the field of magnetic random-access memory for cache applications. He joined A*STAR’s Institute of Materials Research and Engineering (IMRE) in 2018. He currently conducts research in the field of spin orbit torque based random access memory (SOT-MRAM) and high frequency applications of magnonic materials.

This article was made for A*STAR Research by Wildtype Media Group