| Project/Area Number |
23656224
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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 |
Electronic materials/Electric materials
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| Research Institution | Nagasaki University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
NAKANO Masaki 長崎大学, 大学院・工学研究, 准教授 (20274623)
YANAI Takeshi 長崎大学, 大学院・工学研究科, 助教 (30404239)
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| Project Period (FY) |
2011 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2011: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 磁性材料 / 保磁力 / 交換結合 / 反強磁性 / 希土類フリー |
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| Research Abstract |
This investigation proposes the “exchange-coupled magnet”, in which magnetization reversal from the surfaces of a hard grain is prevented by thin ferromagnetic surface layers coupled anti-ferromagnetically with the hard grain. Thecomputer simulation for Nd-Fe-B magnets predicted that the coercivity of the exchangecoupled magnet was 1.5-2 times larger than those without anti-ferromagnetic coupling. In order to achieve such magnets, Cr, Mn, Cy, and V-based alloys were diffused from the surface of rapidly quenched Nd-Fe-B magnet powders into the boundaries between Nd2Fe14Bgrains. However, we have not succeeded to synthesizing such surface layers coupledanti-ferromagneticall with Nd_Fe_B yet
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