Frequency Modulated Terahertz Laser Emitting Devices

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K18872
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 28:Nano/micro science and related fields
• Research Institution: Shinshu University
• Principal Investigator: LIU Xiaoxi 信州大学, 学術研究院工学系, 教授 (10372509)
• Project Period (FY): 2021-07-09 – 2024-03-31
• Keywords: Spin-orbital-coupling / spintronics

Outline of Final Research Achievements

In this research, we have focused on the preparation of the ferrimagnetic single crystal magnetic thin films and graphene films on top it. We have investigated the magnetic, spin transport, transmittance, and spin-orbit coupling in the unique structures. We have also developed a reliable process to introducing periodic domain structures inside the ferrite films. The magnetic films have orthogonal crystal structures. The transmittance higher than 99% were found for wavelengths longer than 1100 nm. We have successfully prepared (00l) orientated graphene films onto the magnetic films according to the X-ray diffraction diagrams. Raman spectrums show clear 2D, G shift of graphene of the films.

Free Research Field

Spintronics

Academic Significance and Societal Importance of the Research Achievements

理論上、グラフェンはディラックコーンと呼ばれるバンド構造が存在し、ディラックコーンの頂点における電子は、位置と運動量がある点に決定されるという、ハイゼンベルグの不確定性原理に相反してしまう状態になる。しかしながら相対論効果では、位置幅と運動量幅を大きくすることで不確定性原理の相反を回避しようとし、そのため電子の速度が急激に大きくなる。本研究はマグノンの電子移動度への影響に着目し、新しい学術原理の発見に役立つ研究である。