| Project/Area Number |
13650354
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | TOKYO INSTITUTE OF TECHNOLOGY (2002)
Tokai University (2001) |
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Principal Investigator |
SANDHU Adarsh Associate Professor, Research Center for Quantum Effect Electronics, Tokyo Institute of Technology, 量子効果エレクトロニクス研究センター, 助教授 (80276774)
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| Co-Investigator(Kenkyū-buntansha) |
INUSHIMA Takashi Professor, School of Electronics and Information Science, Tokai University, 電子情報学部, 教授 (20266381)
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| Project Period (FY) |
2001 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2002: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2001: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | Hall Effect Device / Ferromagnetic materials / Domains / SHPM / Magnetic recording media / Permanent magnets / Pulsed magnetic fields / Magnetic hysteresis / 磁性体 / 磁気記憶媒体 / 強磁性体 |
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| Research Abstract |
A fundamental understanding of the behavior of magnetic domains in external magnetic fields is important for the development of information technology such as ultra-high density magnetic recording media, high coercivity permanent magnets and multilayered ferromagnetic structures used for fabricating novel 'spintronic' devices.
In this research, a unique magnetic imaging system comprising of a room temperature scanning Hall probe microscope with an integrated mini-coil capable of generating pulsed magnetic fields up to 3 Tesla (width of 3.5ms) was developed for the direct and non-invasive magnetic imaging of ferromagnetic micro-domains in the presence of extremely large external pulsed magnetic fields without adverse vibrational disturbance of the sample during measurements. The system was successfully used for magnetic imaging of the erasure process of bit patterns on the surface of 1.4MB written floppy disks and the dynamics of micro-domain structures of demagnetized strontium ferrite permanent magnets under large external pulsed magnetic fields.
The combined mini-coil/RT-SHPM system was demonstrated to be a valuable instrument for the direct, quantitative and non-invasive observation of localized stray magnetic fields at the surfaces of magnetic recording media and ferromagnetic materials in the presence large external bias fields.
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