| Project/Area Number |
18K18849
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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 | Osaka University (2019)
The University of Tokyo (2018) |
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Principal Investigator |
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| Project Period (FY) |
2018-06-29 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
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| Keywords | スピントロニクス / スピン軌道相互作用 / 磁性薄膜 / 電磁石 / スピンエレクトロニクス / 磁性 |
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| Outline of Final Research Achievements |
In this study, we investigate the new operation mechanism of electromagnet based on the spin-orbit torque (SOT). The possibility that the sub-ns switching between multi-domain and single-domain states by SOT has been studied. The following results have been obtained; ① the change from multi-domain to single domain state by SOT has been demonstrated, ② enhancement of SOT by inserting oxidization layer into ferromagnet/heavy metal interface has been confirmed, ③ stability of magnetic domain state by SOT in the nano-second time scale has been confirmed. These results provide us important information for realizing the electromagnet with sub-ns operation.
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| Academic Significance and Societal Importance of the Research Achievements |
電磁石の使い方などというのは既に確立されており、性能を高めるための技術的な改良の余地しかないように思われるだろう。しかし本研究により、スピン軌道相互作用に基づく全く新しい電磁石の実現可能性が見えてきた。これにより、既存の技術では到底達成できないであろう「ピコ秒オーダーの超高速動作」、「十分な磁界出力特性を備えたナノサイズの超小型コイルレス電磁石」の可能性が期待できる。これは、「動作原理を大きく転換させることで、ありふれたデバイスにおける革新的な利用の仕方が生み出される可能性がある」ことを示している点で学術的意義は大きい。
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