2013 Fiscal Year Final Research Report
Investigation of magnetization dynamics in spin-wave metamaterials
| Project/Area Number |
23654124
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | Nara Institute of Science and Technology |
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Principal Investigator |
TOMITA SATOSHI 奈良先端科学技術大学院大学, 物質創成科学研究科, 助教 (90360594)
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| Co-Investigator(Kenkyū-buntansha) |
MITSUMATA Chiharu 物質・材料研究機構, その他部局等, その他 (70600542)
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| Project Period (FY) |
2011 – 2012
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| Keywords | メタマテリアル / 強磁性金属 / スピン波 / 磁気共鳴 / ギルバート緩和定数 / スピントルク発振 / カイラリティ / 応力誘起自己巻き上げ |
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| Research Abstract |
We constructed an analytical model for precession of a magnetic moment in spin-wave metamaterials consisting of interacting magnetic nanoparticles. It is revealed that the Gilbert damping factor can be controlled by the structure of the metamaterials. Additionally, analytical equations of the macroscopic damping factor were obtained for spin-torque oscillation in the spin-wave metamaterials. The equations indicated that the effective damping factor is dependent on the spin currents whereas the frequency of spin torque oscillation is independent of the spin currents. Moreover, we have experimentally succeeded in fabricating artificial chiral structures made of ferromagnetic-metals and observing a characteristic signal in electron spin resonance spectra. The present study is bringing together metamaterials and spintronics via spin-waves.
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