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Terahertz Waves Supercharged: A Breakthrough With Magnetic Materials

June 23, 2024
in Science
Terahertz Waves Supercharged: A Breakthrough With Magnetic Materials
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By Advanced Institute for Materials Research (AIMR), Tohoku University June 23, 2024

Terahertz Waves Magnetic Material Art Concept

A new magnetic material discovered at Tohoku University can generate terahertz waves with significantly greater intensity, offering a potential leap in various technologies, from medical imaging to security. Credit: SciTechDaily.com

Positioned between microwaves and infrared light, terahertz waves are key to pioneering advancements in imaging and diagnostic technologies. A recent discovery at Tohoku University of a material that can emit these waves more intensely promises to catalyze significant breakthroughs across a spectrum of industries.

Terahertz waves are being intensely studied by researchers around the world seeking to understand the “terahertz gap.” Terahertz waves have a specific frequency that put them somewhere between microwaves and infrared light. This range is referred to as a “gap” because much remains unknown about these waves. In fact, it was only relatively recently that researchers were able to develop the technology to generate them. Researchers at Tohoku University have brought us closer to understanding these waves and filling in this gap of knowledge.

Breakthrough in Terahertz Wave Generation

Researchers at the Advanced Institute for Materials Research (WPI-AIMR) and Graduate School of Engineering have discovered a new magnetic material that generates terahertz waves at an intensity about four times higher than that of typical magnetic materials.

Taking advantage of the features unique to terahertz waves, this technology is expected to be used in a variety of industrial fields, including imaging, medical diagnostics, security inspection, and biotechnology. Assistant Professor Ruma Mandal (WPI-AIMR) explains, “Terahertz waves have low photon energies and unlike X-rays, they don’t emit ionizing radiation. So, if they are used for patient imaging or microscopes, they may be less damaging to tissues or samples.”

Generation of Intense Terahertz Waves With a Magnetic Material

(a) Weyl magnet: schematic diagram of a crystal of cobalt-manganese-gallium Heusler alloy (Co2MnGa). (b) Light-induced terahertz waves. Credit: Shigemi Mizukami

Enhancing Terahertz Emission With Weyl Magnets

With these applications in mind, a team of researchers at Tohoku University aimed to develop an efficient, compact, sturdy, and cost-effective terahertz wave emitter. Weyl magnets — a type of topological material — have been shown to generate a huge anomalous Hall effect that make them suitable for generating terahertz waves. In this study, single-crystal thin-film samples of a Weyl magnet made from a cobalt-manganese-gallium Heusler alloy were prepared and studied under various conditions.

Photo-Induced Terahertz Waves Generated From the Weyl Magnet

(a) Photo-induced terahertz waves generated from the Weyl magnet: cobalt-manganese-gallium Heusler alloy (Co2MnGa) thin film observed in this study. (b) Anomalous Hall effect observed in the corresponding thin film sample. Credit: Shigemi Mizukami

The Future of Terahertz Wave Research

It was found that the giant anomalous Hall effect originating from the topological electronic structure unique to Weyl magnets enhanced the photo-induced terahertz waves. This achievement will deepen our understanding of the interplay of light and spin in Weyl magnets.

“Although the intensity of the terahertz waves generated is still lower than that of spin-excitation terahertz emitters developed to date,” says Professor Shigemi Mizukami, “the structure is simpler and expensive heavy metals such as platinum are no longer required.”

Mandal and their colleagues were able to experimentally demonstrate the ability of this magnetic material to produce terahertz waves, so that it can be used in spintronic devices and other important applications. Such a discovery in a newly emerging field could shape the future of next-generation technologies.

This work was published in NPG Asia Materials on June 7, 2024.

Reference: “Topologically influenced terahertz emission in Co2 MnGa with a large anomalous Hall effect” by Ruma Mandal, Ren Momma, Kazuaki Ishibashi, Satoshi Iihama, Kazuya Suzuki and Shigemi Mizukami, 7 June 2024, NPG Asia Materials.
DOI: 10.1038/s41427-024-00545-9

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/terahertz-waves-supercharged-a-breakthrough-with-magnetic-materials/

Tags: scienceTerahertzwaves
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