1993 Fiscal Year Final Research Report Summary
ULTRATHIN VERY LOW LOSS Co-BASED AMORPHOUS RIBBONS AND DEVELOPMENT OF MICRO MAGNETIC DEVICES.
| Project/Area Number |
04555072
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
電子材料工学
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| Research Institution | KUMAMOTO INSTITUTE OF TECHNOLOGY (1993)
Miyagi National College of Technology (1992) |
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Principal Investigator |
YAGI Masaaki Kumamoto Institute of Technology, Applied Electronics Laboratory for Energy.Prof., 工学部, 教授 (80005371)
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| Co-Investigator(Kenkyū-buntansha) |
SAWA Takao Toshiba Co.Ltd., New Materials Engig.Laboratory., 新素材応用研究所, 主査
SASADA Ichiro Kyusyu Univ.Dept.of Engig., Associate Prof., 工学部, 助教授 (20117120)
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| Project Period (FY) |
1992 – 1993
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| Keywords | Co-based amorphous alloys / Ultrathin ribbons / Very low core loss / High initial permeability / Micro magnetic devices |
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| Research Abstract |
Ultrathin very low loss Co-based amorphous ribbons were fabricated in vacuum and high-frequency micro power magnetic-devices were studied to make by these ribbons.
The samples used were zero magetostrictive ((Fe-Co)Cr_y)_x(Si-B)_<100-x'>(x=75-81), (y=0.05-0.06) amorphous alloys with a thickness of 5-6mum. The results obtained were as follows.
Extremely low core loss beyond 100 kHz was attained for the samples with a transverse field annealing. In the case of 6.0 mum thick ((Fe-Co)Cr_<0.06>)_<79>(Si-B)_<21> ribbon cores, the loss at 1 MHz for maximum flux density B_m=0.1T was 700 (mW/cc). This value was about 1/4 of that of Mn-Zn high-frequency ferrites or 5 mum Supermalloy tape wound cores.
Furthermore, marked improvements of frequency dependence of initial permeability were also obtained for ((Fe-Co)Cr_y)_x(Si-B)_<100-x'>(x=76-81) ribbons with transverse field annealing.
Now, some planer micro transformers or inducters are being produced by these ultrathin amorphous ribbons.
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