| Project/Area Number |
11650721
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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 |
Structural/Functional materials
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| Research Institution | Fukui National College of Technology |
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Principal Investigator |
YUKIMI Jyoko Fukui National College of Technology, Department of Chemistry & Biology Engineering, Associate Professor, 物質工学科, 助教授 (40211974)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Keywords | Electrodeposition / Metallic Artificial Superlattice / Nanowire / Giant Magnetoresistance / Perpendicular Magnetic Anisotropy |
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| Research Abstract |
Since the discovery of perpendicular magnetic anisotropy, magneto-optical Kerr effect and giant magnetoresistance in metallic multilayers, interest in magnetic multilayered nanostructures has been greatly stimulated. Currently the development of new magnetic nanostructures has attracted considerable attention for potential applicability to high density magneto-optical recording media or magnetoresistive sensor devices. Most magnetic nanostructures have been fabricated by sputtering or molecular beam epitaxy, which have proved to be the most suitable for the controlled preparation of high-quality structures on an atomic scale. Electrodeposition may also be more promising for all practical purposes, given the efficiency and the simplicity of the required equipment. We have presented the first direct evidence for composition modulation across successive layers in a Co/Pt nanometer-multilayered structure grown on a Pt (111) substrate by electrodeposition under potential control. Giant magnetoresistance and oscillatory antiferromagnetic interlayer coupling have been observed in an fcc (111) textured Co/Cu multilayered nanostructure. Moreover, a large saturation magnetoresistance of more than 20% has been achieved at room temperature for a heterogeneous Co-Cu alloy, which consists of ultrafine fcc Co-rich clusters in a nonmagnetic Cu matrix. Multilayered fcc Co/Pt and CoNi/Pt nanostructures, respectively, exhibit a remanent perpendicular magnetization and a large magnetic coercivity, which depend on the multilayer growth mechanism. Further studies on the growth kinetics and mechanism are necessary to achieve improved structural and magnetic qualities in the electrodeposited nanostructures, and also apply to patterning on the nanometer scale or multilayer nanowires.
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