2013 Fiscal Year Final Research Report
High-resolution and dynamic domain observation in demagnetization process at elevated temperature using UV Kerr microscope
| Project/Area Number |
23560402
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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 |
TAKEZAWA Masaaki 九州工業大学, 工学(系)研究科(研究院), 准教授 (20312671)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 電子デバイス・電子機器 / 磁区観察 / 磁区構造 / 磁気Kerr効果 / ハード磁性材料 / 磁化反転 / 磁化過程 / 磁気異方性 |
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| Research Abstract |
Magnetization reversal were clearly observed with a high-resolution and dynamic domain observation system using Kerr microscope in order to analyze the mechanism of magnetization reversal in high-anisotropic magnetic materials at elevated temperatures. It was found that nanometer-sized domain patterns could be observed with the UV Kerr microscope with a wavelength of 248 nm. The coercivity of the magnetic materials depends on the volume of magnetically coupled grains that simultaneously reverse their magnetization. We found that simultaneous magnetization reversal in several grains occurred at elevated temperatures, and the extent of simultaneous magnetization reversal increases with temperature.
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