| Project/Area Number |
25420686
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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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| Research Field |
Physical properties of metals/Metal-base materials
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| Research Institution | Tohoku University |
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Principal Investigator |
Sakuma Akimasa 東北大学, 工学(系)研究科(研究院), 教授 (30361124)
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| Co-Investigator(Kenkyū-buntansha) |
MIURA Daisuke 東北大学, 大学院工学研究科, 助教 (90708455)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | ギルバート緩和 / スピン動力学 / 第一原理計算 / 遷移金属 / ホイスラー合金 / スピン軌道相互作用 / 磁気緩和 / 磁気異方性 |
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| Outline of Final Research Achievements |
We have theoretically studied the microscopic feature of the Gilbert damping in magnetization dynamics, and performed the first principles calculation for the Gilbert damping constant, α for transition metal alloys. We found that the two different descriptions for α by torque correlation (TC) method and spin correlation (SC) method in turn provide the same result and furthermore the TC method is more suitable for actual calculations for α, because it avoids some problems in numerical processes. Based on this consideration, using the first principles technique under the TC method, we have calculated αfor some Heusler alloys and clarified that the value of α is strongly affected by the density of states at the Fermi level.
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