| Project/Area Number |
15360170
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | NAGASAKI UNIVERSITY |
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Principal Investigator |
FUKUNAGA Hirotoshi Nagasaki University, Faculty of Engineering, Professor, 工学部, 教授 (10136533)
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| Co-Investigator(Kenkyū-buntansha) |
NAKANO Masaki Nagasaki University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (20274623)
YANAI Takeshi Nagasaki University, Faculty of Engineering, Research Associate, 工学部, 助手 (30404239)
吉沢 克仁 日立金属(株), 先端エレクトロニクス研究所, 主任研究員
掛橋 英典 松下電工(株), 照明R&Dセンター, 主査技師
金井 泰久 長崎大学, 工学部, 講師 (00264200)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥15,200,000 (Direct Cost: ¥15,200,000)
Fiscal Year 2005: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2004: ¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 2003: ¥7,100,000 (Direct Cost: ¥7,100,000)
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| Keywords | Magnetic loss / Nano-materials / Electronic Materials / Creep / Electronic Devices / Permeability / Magnetism / 誘導磁気異方性 / ナノ結晶材料 / 透磁率制御 / 応力下連続焼鈍 / 高周波特性 / PLD / 交換スプリング磁石 / ナノ結晶 / 最大エネルギー積 / 保磁力 / ND-Fe-B / 積層膜 |
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| Research Abstract |
A new material with controllable permeability and extremely low magnetic loss was developed through this research project. The material was prepared by the crystallization of an amorphous Fe-Nb-Si-B ribbon under tensile stress. The crystallization under tensile stress induced magnetic anisotropy perpendicular to the ribbon axis, and resulted in the linear magnetization curve up to magnetic saturation. As the magnitude of the anisotropy was proportional to the stress value, the permeability was controlled easily by changing the magnitude of the applied stress.
The crystallization under tensile stress was achieved by several annealing methods. In the methods, the continuous crystallization of a moving amorphous ribbon by Joule-heating enabled us to prepare a ribbon with controlled permeability under the moving velocity exceeding 200cm/min. As the development of the anisotropy can be completed in an extremely short time less than 1 sec, the continuous crystallization under a faster moving velocity is expected by improving apparatus for crystallization.
Toroidal cores were obtained from a developed ribbon, and their magnetic properties were evaluated at the frequencies up to 2MHz. The prepared cores exhibited superior soft magnetic properties reflecting the magnetic properties of the ribbon, when their diameters were larger than a critical value which was determined from the saturation magnetostriction, Young modulus, and the thickness of the ribbon. Permeability of a core could be controlled at a value of a several hundreds and was constant up to 2MHz. Magnetic loss of the obtained cores was 1/3 of that of a ferrite core. The DC-bias filed applicable to the cores without deterioration of magnetic properties was 3 times as large as that of a ferrite core, which can be attributed to the large saturation magnetization of the developed material.
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