| Project/Area Number |
14205093
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical properties of metals
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
SUMIYAMA Kenji Nagoya Institute of Technology, Graduate School of Technology, Department of Materials Science and Engineering, Professor, 工学研究科, 教授 (70101243)
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| Co-Investigator(Kenkyū-buntansha) |
MORIKAWA Hiroshi Nagoya Institute of Technology, Graduate School of Technology, Department of Materials Science and Engineering, Professor, 工学研究科, 教授 (90024314)
HIHARA Takehiko Nagoya Institute of Technology, Graduate School of Technology, Department of Materials Science and Engineering, Associate Professor, 工学研究科, 助教授 (60324480)
IWATSU Fumio Nagoya Institute of Technology, Graduate School of Technology, Department of Materials Science and Engineering, Lecturer, 工学研究科, 講師 (10135410)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥45,500,000 (Direct Cost: ¥35,000,000、Indirect Cost: ¥10,500,000)
Fiscal Year 2004: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
Fiscal Year 2003: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2002: ¥28,990,000 (Direct Cost: ¥22,300,000、Indirect Cost: ¥6,690,000)
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| Keywords | composite cluster / cluster assembly / plasma-gas-condensation / transmission electron microscopy / electrical property / magnetic property / optical property |
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| Research Abstract |
We have obtained the following research results during the period of this research plan.
We produced a new cluster deposition system in which electrical powers can be independently applied to two cluster sources for preparing composite cluster assemblies and applied this system to a patent By adjusting the cathode arrangement, cathode angle and nozzle shapes, moreover, we have dramatically improved the cluster productivity. : the cluster production efficiency is two order of magnitude higher than usual glow discharge cluster deposition systems.
We prepared Si (or Al) and Fe composite cluster assemblies by a conventional double cluster source system and observed their structure and chemical composition. When two different kind clusters collide each other in the later stage, Si (or Al) and Fe clusters independently existed on the substrate. When they collide each other in the early stage, Fe core clusters are covered with small Si (or Al) clusters, forming a core-shell clusters. Magnetic and X-ray photoelectron spectroscopy measurements demonstrated that such core shell clusters were rather stable against oxidation.
We deposited ionized clusters which were accelerated electrically and impinged on a electrically biased substrate. Packing fraction. P_A and saturation magnetization, M_S of Fe cluster assemblies increase rapidly and magnetic coercivity decreases remarkably with increasing the bias voltage, V_B. The Fe cluster-assembly obtained at V_B=-20 kV has P_A=86%, M_S=17.8 kG, and the coercivity value smaller than 1 Oe. The resistivity at room temperature is ten times larger than that of bulk Fe metal.
Moreover, we tried to prepare Fe nano-particles via liquid phase routes and observe their structure, magnetic and optical properties for comparison. The obtained nano-particles were a little degraded by oxidation and impurities, however, they are mass-productive and their shape and arrangement are controllable with adjusting the suitable surfactants.
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