2020 Fiscal Year Annual Research Report
| Project/Area Number |
19H00645
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| Research Institution | Tohoku University |
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Principal Investigator |
Bauer Gerrit 東北大学, 材料科学高等研究所, 教授 (10620213)
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | Spintronics / magnonics / cavities / ferroelectriscs |
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| Outline of Annual Research Achievements |
The project addresses magnon chemistry, i.e., the interaction of magnons with each other and with other particles or (quasi)particles, such as photons and phonons, by the methods of theoretical physics. We approach the problems interdisciplinary by addressing them from the viewpoint of magnetism, spintronics, microwave technology, device physics, low temperature physics, ferroelectricity, and quantum information science. The theoretical methods span the width from first-principles calculations and simulations, micromagnetics, quantum magnonics, and quantum Langevin equations, analytically and numerically. We predict effects that can be measured or explain phenomena observed by our experimental colleague at Tohoku University and overseas. The results are published in high-profile scientific journals and at international conferences.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
Our research in the fiscal year 2020-21 focused on the chirality of magnons when excited by microwaves and for hybrid quasi particles such as magnon polaritons and magnon polarons, the hybrid states of magnons with cavity photons and phonons such as surface acoustic waves. For example, we explained in detail the chirality of propagating magnon features when excited by narrow wave guides and detected by NV-center microscopy. We showed as well that the magnons in spatially separated magnons are coupled together by the exchange of spin waves in an underlying magnetic field and explored the magnon Seebeck effect at low temperatures. We also explained the first observation of optical magnons by inelastic neutron scattering.
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| Strategy for Future Research Activity |
We plan to continue our research activities on a high level, with increased emphasis on magnon interactions due to non-linearities, the effects of dimensionality on magnons in ultra thin films and new materials such as layered van der Waals compounds, magnons in antiferromagnets, quantum magnonics, and the analogue of magnons in ferroelectrics, i.e. ferrons.
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[Journal Article] Observation of Magnon Polarization2020
Author(s)
Nambu Y.、Barker J.、Okino Y.、Kikkawa T.、Shiomi Y.、Enderle M.、Weber T.、Winn B.、Graves-Brook M.、Tranquada J.?M.、Ziman T.、Fujita M.、Bauer G.?E.?W.、Saitoh E.、Kakurai K.
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Journal Title
Physical Review Letters
Volume: 125
Pages: 027201 pp. 1-6
DOI
Peer Reviewed / Open Access / Int'l Joint Research
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