Magnon-phonon hybridization in nearly compensated magnets for thermoelecric conversion and heat control
| Project/Area Number |
20K05297
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 29010:Applied physical properties-related
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| Research Institution | Tohoku University |
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Principal Investigator |
RAMOS Rafael 東北大学, 材料科学高等研究所, 助教 (40839312)
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| Project Period (FY) |
2020-04-01 – 2021-03-31
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| Project Status |
Discontinued (Fiscal Year 2020)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | Spintronics / Magnons / Phonons / spin Seebeck / magnetic compensation / Spin Caloritronics / Thermoelectricity / Magnetic materials / Magnetic oxides |
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| Outline of Research at the Start |
Heat driven spin transport in insulating materials, the spin Seebeck effect (SSE), offers the possibility for energy conversion and information transport with lower dissipation losses, but the small magnitude limits its potential for applications. Recently, the spin-lattice interaction has been found to improve the SSE conversion efficiency due to magnon-phonon hybridization. As a result of this and other discoveries, there is a growing interest in spin-lattice interaction effects, having the potential for improved spin transport properties and possibly magnetic field control of heat flow.
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| Outline of Annual Research Achievements |
The project deals with the investigation of spin-lattice interaction effects in magnetic insulators, in particular the effect of magnetic compensation on spin-heat conversion (spin Seebeck effect: SSE) in Ga-substituted yttrium iron garnet (Ga-YIG), with increasing Ga-substitution the magnetic compensation increases.
I optimized the growth of high-quality Ga-YIG by liquid phase epitaxy, the structural quality was confirmed by x-ray diffraction. The presence of peaks in the SSE voltage at lower magnetic field than in YIG confirm the larger compensation and high magnetic quality of the films.
Further spin transport studies on the grown films are to be performed to investigate the role of magnetic compensation on magnon-phonon hybridization and its effect on the spin-heat conversion properties.
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Report
(1 results)
Research Products
(5 results)
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[Journal Article] Identification of Neel vector orientation in antiferromagnetic domains switched by currents in NiO/Pt thin films2020
Author(s)
C. Schmitt, L. Baldrati, L. Sanchez-Tejerina, F. Schreiber, A. Ross, M. Filianina, S. Ding, F. Fuhrmann, R. Ramos, F. Maccherozzi, D. Backes, E. Saitoh, G. Finocchio, M. Klaui
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Journal Title
Related Report
Int'l Joint Research
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