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Cutting sound waves’ offer the miracle of combining ultrasound and magnetic waves

'Cutting sound waves' offer the miracle of combining ultrasound and magnetic waves

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Design drawing. Credit: Physical Examination Letters(2024). DOI: 10.1103/PhysRevLett.132.056704

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Design drawing. Credit: Physical Examination Letters (2024). DOI: 10.1103/PhysRevLett.132.056704

A team led by researchers at the RIKEN Center for Emergent Matter Science in Japan has succeeded in creating a strong coupling between two types of wavemagnons and phonons in a thin film. Importantly, they achieved this at room temperature, paving the way for the development of hybrid wave devices where information can be stored and used in a variety of ways.

Most of the computing devices used today are based on the movement of electrical electrons, but there are limits to how fast the electrons can travel, and their movement generates heat, causing energy loss and an unfriendly environment. lovely.

As a result, scientists are working to develop materials that use energy such as waves such as sound, light and rotation, as they can lead to the creation of materials that are not lost.

For current research, published in Physical Examination LettersThe scientists looked at two types of waves: magnonsquasiparticles representing the combined excitation of spins, magnetic properties, and phononsan acoustic phenomenon which in this case was made up of surface waves. water spreading near the film.

According to Yunyoung Hwang, first author of the study, “Devices using magnons and phonons have been developed, but we, like other researchers, thought that combining ultrasound and magnets would can lead to a big leap in information and communication technology. Countries are working hard together, creating a hybrid country, and we feel that this will open the door to exciting developments in information processing. “

Although other groups have tried to do this, there has been a problem: sound waves normal to the surface do not connect well with the magnets. The team was able to crack this code by using a different type of sound wave, called a shear wave, that works better with magnets.

The key element that made the work possible was a tiny on-chip device called a nano-structured surface acoustic wave resonator. It blocks the ultrasound waves in a certain area and amplifies the shear sound waves, allowing a strong coupling between the surface sound waves and the magnet inside the resonator. With this, the researchers were able to achieve a strong magnetic resonance connection to Co20Fe60B20 film, room temp.

According to Jorge Puebla, another author of the study, “In particular, we believe that our work will contribute to the study of magnon-phonon quasiparticles, which can help the development of information processing devices of a low-loss wave. .

“Besides this, two interesting possibilities arise: the development of our equipment can lead us to a strong integration regime, which is an area that has yet to be fully explored; on the contrary, with performing similar experiments at very low temperatures, we have the opportunity to explore quantum phenomena.”

Additional information:
Yunyoung Hwang et al. Physical Examination Letters (2024). DOI: 10.1103/PhysRevLett.132.056704. It is open arXiv: DOI: 10.48550/arxiv.2309.12690

Newspaper articles:
Physical Examination Letters


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