2020 Fiscal Year Final Research Report
Wet Process Fabrication of Metal-Oxide Granular Films with Magnetic Anisotropy Direction Change with Thickness
| Project/Area Number |
16K06282
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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 |
Electronic materials/Electric materials
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| Research Institution | Nara National College of Technology |
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Principal Investigator |
Fujita Naoyuki 奈良工業高等専門学校, 電気工学科, 教授 (90249813)
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| Co-Investigator(Kenkyū-buntansha) |
平井 誠 長岡工業高等専門学校, 電気電子システム工学科, 准教授 (00534455)
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| Project Period (FY) |
2016-04-01 – 2021-03-31
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| Keywords | 磁場中電析 / 異方性方向制御 / 電磁波吸収材料 / ウェットプロセス形成 |
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| Outline of Final Research Achievements |
Amorphous Fe-B bilayers with orthogonal easy axes of magnetization were prepared by electrodeposition by changing the direction of the externally applied magnetic field during the process. In order to suppressed the dispersion in the magnetic properties of the first and second layers of film, the temperature of the reaction solution was kept constant by using a pump to supply the solution. As a result, it was found that two-layer thin films with orthogonal easy magnetization axes can be easily prepared by electrodeposition.
In addition, a new method of fabricating insulating films containing metal ultrafine particles was investigated. Fe-Ni particles with polyelectrolyte adsorbed on the surface were immersed in water-soluble epoxy solution. By electrodeposition using this solution for 5 minutes, a thin film with a thickness of 80 μm and a magnetic particle content of 22% was obtained.
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| Free Research Field |
電気電子材料
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| Academic Significance and Societal Importance of the Research Achievements |
通信が高速になるに伴って，高い周波数で動作する電磁波吸収材料が必要となっている．本研究は，めっき法という安価な方法で，優れた電磁波吸収材料を作ることを目指している．外部から電磁石で磁界を加えながら，めっきすると，磁界を加えた方向が磁石になりやすい膜（磁化容易軸という）ができる．磁界を加える方向をめっきの途中で９０°ずらすことで，膜の厚さ方向で，磁化容易軸が９０°ずれた膜が作製できた．こうすることで，あらゆる方向からくる電磁波が吸収できるようになる．
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