| Project/Area Number |
07454088
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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 |
固体物性Ⅱ(磁性・金属・低温)
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| Research Institution | National Laboratory for High Energy Physics |
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Principal Investigator |
KOIDE Tsuneharu National Laboratory for High Energy Phisics, Photon Factory, Assistant professor, 放射光実験施設, 助教授 (10150012)
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| Co-Investigator(Kenkyū-buntansha) |
SHIDARA Tetsuo National Laboratory for High Energy Phisics, Photon Factory, Assistant professor, 放射光実験施設, 助教授 (50132684)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 1996: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1995: ¥5,600,000 (Direct Cost: ¥5,600,000)
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| Keywords | Metallic magnetic superlattices / Molecular beam epitaxy / Circularly polarized synchrotron radiation / Core-level absorption / Magnetic circular dichroism |
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| Research Abstract |
1.An ultrahigh-vacuum main chamber for a molecular beam epitaxy (MBE) apparatus was designed and constructed. A He-gas leak test showed no leak in the chamber. A 24-h baking resulted in an ultimate pressure of 4 x 10^<-11> Torr using a 500 l/s ion pump as well as a 400 l/s turbo-molecular pump.
2.An electron gun for reflection high energy electron difraction (RHEED) and a RHEED power supply were designed and fabricated. The beam-spot diameter was found to be less than the designed value of 90mum.
3.A sample-substrate preparation chamber was designed and fabricated. An O-ring seal mechanism allows a rapid exchange of sample substrates.
4.An MBE system was completed by incorporating in the main chamber, an e-beam evaporation gun, Knudesen cells, a quartz-oscillating thickness monitor, a RHEED gun, vacuum pumps, and the sample-substrate preparation chamber.
5.Co/Pt multilayrs were prepared. Low-angle and high-angle x-ray diffraction measurements were made for the multilayrs. Designed superlattices were confirmed. Torque measurements were made, confirming perpendicular magnetic anisotropy in samples with very thin Co-layr thickness.
Core-level magnetic circular dichroism measurements were made for the multilayrs using circularly polarized synchrotron radiation. The results showed an enhancement of the Co orbital magnetic moment and a narrowing of the Co 3d band for samples with very thin Co-layr thickness. It was also found that magnetic moments, coupled ferromagnetically with the Co magnetic moments, were induced on Pt atoms.
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