Analysis of magnetization reversal of Nd-Fe-B magnets by dynamic domain observation with a Kerr microscope
| Project/Area Number |
26420311
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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 |
Electron device/Electronic equipment
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| Research Institution | Kyushu Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 磁区観察 / 磁区構造 / 磁気Kerr効果 / ハード磁性材料 / ネオジム磁石 / 減磁過程 |
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| Outline of Final Research Achievements |
We observed the demagnetization behavior of Nd-Fe-B magnets by observing their magnetic domains with a high-resolution and dynamic domain observation system using Kerr effect microscope. The relation between the domain configuration and microstructure observed by a scanning electron microscope was investigated. The reversal domains nucleated from the impurity site and a-Fe enriched point that deteriorate hard magnetic properties. Moreover, magnetic interaction among the grains beyond the grain boundaries caused simultaneous magnetization reversal. The large magnetization-reversal clusters produced the low-coercivity, and also reduced the squareness of the magnet.
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Report
(4 results)
Research Products
(23 results)
