2020 Fiscal Year Annual Research Report
Characterization of Coupling between Mechanical Angular Momentum and Electron Spin
| Project/Area Number |
19J21720
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| Research Institution | The University of Tokyo |
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Principal Investigator |
許 明然 東京大学, 新領域創成科学 研究科, 特別研究員(DC1)
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| Project Period (FY) |
2019-04-25 – 2022-03-31
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| Keywords | Magnon / Phonon / Surface acoustic wave / Magnetoelastic wave / Spin wave |
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| Outline of Annual Research Achievements |
Magnon and phonon are different quasiparticles with their own attractive advantages and individual disadvantages on building future electronics. Magnon has tremendous application but short decay length. On the contrary, phonon has long decay length but limited functionalities. Magnon phonon hybridized system presents features inherited from magnon and phonon, showing long decay length in millimeters and versatile functionalities. In recent years, with the development of technology and further extended knowledge, the magnon phonon coupling(MPC) study focuses on the interaction of surface acoustic waves with a magnetic thin film. Interestingly, in this situation, where trivial magnon couples to trivial surface phonon state, there emerges nontrivial consequence of MPC, nonreciprocity.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Up to now, we have achieved highly efficient spin current generation using magnon-phonon coupling, giant nonreciprocity in a magnon-phonon hybrid system. Both are of great potential for future electronics. The efficient spin current generation may enable the integration with a memory device, while nonreciprocal transport is of great potential for replacing high-frequency microwave isolator, which is widely used in digital communication. In addition to the previous, probing the Dzyaloshinskii-Moriya interaction constant is also achieve by magnon-phonon hybridized system. Recently, by anti-crossing of spin-wave and elastic wave dispersion, we achieve zero group velocity of elastic wave, which, consequently, stops propagation and functions as an acoustic switch.
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| Strategy for Future Research Activity |
For either magnonic or phononic circuits, a nonreciprocal device is an essential element. For further study on magnon-phonon coupling, we will work on controlling the nonreciprocity. From the previous study, we concluded that MPC nonreciprocity mainly depends on the ratio between magneto-rotation coupling (MRC) and magnetoelastic coupling (MEC). Thus, in principle, by controlling the MEC, it is possible to modulate the magnitude and sign of the nonreciprocity. From the literature, we found that MEC of nickel and iron alloy highly depend on its composition ratio. This system is fairly an ideal platform for examining the influence of MRC in nonreciprocity and realizing nonreciprocity modulation.
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Research Products
(9 results)
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[Journal Article] Nonreciprocal surface acoustic wave propagation via magneto-rotation coupling.2020
Author(s)
Mingran Xu, Kei Yamamoto, Jorge Puebla, Korbinian Baumgaertl, Bivas Rana, Katsuya Miura, Hiromasa Takahashi, Dirk Grundler, Sadamichi Maekawa, Yoshichika Otani.
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Journal Title
ScienceAdvances
Volume: 1724
Pages: 1,4
DOI
Peer Reviewed / Open Access / Int'l Joint Research
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