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2023 Fiscal Year Final Research Report

Research of synthetic antiferromagnet for THz devices with Brillouin light scattering

Research Project

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Project/Area Number 21H01791
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 29010:Applied physical properties-related
Research InstitutionTohoku University

Principal Investigator

Kikuchi Nobuaki  東北大学, 多元物質科学研究所, 准教授 (80436170)

Co-Investigator(Kenkyū-buntansha) 岡本 聡  東北大学, 多元物質科学研究所, 教授 (10292278)
島津 武仁  東北大学, 学際科学フロンティア研究所, 教授 (50206182)
Project Period (FY) 2021-04-01 – 2024-03-31
Keywordsブリルアン散乱 / 磁性体 / 磁化ダイナミクス / 強磁性共鳴
Outline of Final Research Achievements

A Brillouin scattering system for magnetization dynamics measurement has been constructed to explore terahertz wave devices in artificial antiferrostructures in the terahertz region. The magnetic signal from magnons is weak, so the spacing and parallelism of the interferometer, which consists of two semipermeable mirrors, must be controlled at sufficiently small values relative to the wavelength of light. In this study, by optimizing the temperature control and feedback circuit of the interferometer, we succeeded in stably measuring the Brillouin scattering signal of about 1 cps at about 50 GHz.

Free Research Field

磁性材料

Academic Significance and Societal Importance of the Research Achievements

磁性体はテラヘルツ領域での応用が期待される一方,その領域での評価手法は限られているのが現状であった.本研究では,光とマグノンの相互作用を計測するブリルアン散乱を本領域での計測法として確立することを目指した.本手法では,既存の手法と比べて大振幅の励起が不要であり,安定状態での挙動を計測できるという利点がある.本課題では,最終目標とした0.1THz以上の周波数までの到達はできなかったものの,その半分の50GHzでの信号検出と,今後のアプローチについての知見を得ることができた.

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Published: 2025-01-30  

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