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Making Waves: Generation of Intense Terahertz Waves with a Magnetic Material

Results published in "NPG Asia Materials" on June 7, 2024 and press release issued on June 19, 2024.

2024.06.21

Terahertz waves are being intensely studied by researchers around the world seeking to understand the "terahertz gap". Terahertz waves have a specific frequency that puts 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.
 
Researchers at the Advanced Institute for Materials Research (WPI-AIMR), Graduate School of Engineering, and Frontier Research Institute for Interdisciplinary Sciences (FRIS) 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."
This work was published in NPG Asia Materials on June 7, 2024.
 
 

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

Publication Details:
Title: Topologically influenced terahertz emission in Co2MnGa with large anomalous Hall effect
Authors: Ruma Mandal, Ren Momma, Kazuaki Ishibashi, Satoshi Iihama, Kazuya Suzuki, and Shigemi Mizukami
Journal: NPG Asia Materials
DOI: https://doi.org/10.1038/s41427-024-00545-9
 
The Advanced Institute for Materials Research (AIMR), Tohoku University
https://www.wpi-aimr.tohoku.ac.jp/en/achievements/press/2024/20240610_001808.html
 
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