| Project/Area Number |
63470038
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
無機・錯塩・放射化学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
NAKAYAMA Noriaki Kyoto University, Institute for Chemical Research, Assistant Professor, 化学研究所, 助教授 (00164369)
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| Co-Investigator(Kenkyū-buntansha) |
HOSOITO Nobuyoshi Kyoto University, Institute for Chemical Research, Assistant, 化学研究所, 助手 (30165550)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 1989: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1988: ¥4,600,000 (Direct Cost: ¥4,600,000)
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| Keywords | 3d-metal antimonide / Monolayers / Ferromagnetism / Epitaxial Growth / Interfacial Reaction / Multilayered Films / Thin films / 単原子層の磁性 / 界面の反応性 / 化合物薄膜 |
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| Research Abstract |
Structural and magnetic properties of M/Sb ( M : Cr, Mn, Fe, Co and Ni ) multilayered films have been investigated. Reactivities of their interfaces vary in a wide range.
In the case of Mn, Ni and Cr with higher reactivity, samples containing monolayers of NiAs-type 3d-metal antimonide MSb are obtained. They show interesting magnetic properties.
1. Interfaces in Mn/Sb multilayered films are the most reactive. Even when substrate was kept at -1OOﾟC ( Ts=-100ﾟC ), MnSb is formed at the interfaces. A sample with nominal thickness of [Mn(lA^ﾟ)/Sb(500A^ﾟ)]_<90> (Ts=R.T.) contains MnSb monolayers epitaxially grown.
The structures of MnSb monolayers have been revealed by x-ray diffraction and cross-sectional TEM. MnSb monolayeres show a ferromagnetism, of which long range order is completed below 80K. Even below 80K, magnetization shows a fluctuation because of 2-dimensionality.
2. The reactivity of Cr/Sb interfaces is a modest one. Epitaxial CrSb monolayers are obtained when substrate was kept at 80ﾟC. CrSb monolayers show a weak ferromagnetism whereas bulk CrSb shows antiferromagnetism.
3. The reactivity of Ni/Sb interfaces is comparable with that of Mn/Sb interfaces.
However, crystillinity of NiSb monolayers is not so good because of a large lattice misfit between NiSb and Sb. NiSb monolayers show a weak paramagnetism as well as bulk NiSb.
4. Reactivities of Co/Sb and Fe/Sb interfaces are too low even when Ts is 100ﾟC to obtain CoSb and FeSb monolayers.
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