2020 Fiscal Year Final Research Report
Exploration of ultra-high speed spintronic devices using antiferromagnets
| Project/Area Number |
19K21972
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 21:Electrical and electronic engineering and related fields
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2019-06-28 – 2021-03-31
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| Keywords | スピントロニクス / 反強磁性体 / 反強磁性共鳴 |
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| Outline of Final Research Achievements |
The purpose of this study is to understand the antiferromagnetic magnetization dynamics in the ultra-short time domain and to demonstrate the magnetization reversal device. First, we investigated the magnetization dynamics of antiferromagnetic materials such as NiO and α-Fe2O3, and found that the resonance frequency and damping constant, which are important for understanding the magnetization dynamics, can be controlled depending on the crystallinity and cation substitution elements. Second, we devised a photoconductive switch which generates and injects a picosecond current pulse into the antiferromagnetic element to reverse the magnetization. The magnetization reversal has not been clearly captured yet. Meanwhile, some issues have been identified regarding the optimization of the photoconductive switch and the current pulse introduction method. The research will be continued to achieve the goals.
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| Free Research Field |
スピントロニクス
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| Academic Significance and Societal Importance of the Research Achievements |
本研究は、将来の超高速通信や超高速情報処理に供する革新的超高速スピンデバイスの実証を目指す挑戦的なものである。今回得られた反強磁性体の共鳴周波数や磁気ダンピング等の磁化ダイナミクス制御に関する知見は、超高速スピンデバイスを設計する上で重要な指針となる。超高速磁化反転を明瞭に捉えることはできなかったが、超高速スピンデバイスを実現する上で複数の具体的な問題点について洗い出すことができた。今後研究を継続することによって、反強磁性スピンデバイスの超高速動作が実証できれば、従来のスピントロニクス素子では成し得なかった時間領域（＜ピコ秒）の超高速性能を持つ革新的スピンデバイスへと展開できる。
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