| Project/Area Number |
14592002
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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 |
電子・電気材料工学
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| Research Institution | Osaka University |
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Principal Investigator |
TABATA Hitoshi Osaka University, The Institute of Scientific and Industrial Research, Professor, 産業科学研究所, 教授 (00263319)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2003: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2002: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | ferroelectrics / ferromagnet / artificial lattice / perovskite / laser MBE / memorv device / functional materials / brain mimetic device / 悩型素子 |
|---|
| Research Abstract |
Superlattices of transition metal oxides have been formed by a laser Molecular Beam Epitaxy (MBE) technique connected with RHEED monitoring system. The superlattices of magnetics have been constructed on SrTiO_3(100), (110) and (111) surfaces. These surface selection enables us tocontrol the threedimensional positioning of atoms and spin. In the case of LaCrO_3/LaFeO_3 superlattices on (111) surface, ferromagnetism has been realized for the first time. In the case of LaMnO3/LaFe03 superlattices, on the other hand, spin frustration is expected competing with ferromagnetism of self-doped LaMnO_33 and anti-ferromagnetism of LaFeO_3 on SrTiO3 (100) surface. Spin glass phase transition (casp shape in magnetization vs. temperature measurements) is observed in the case of LaMnO_3/LaFeO_3 superlattices. It is due to the spin frustration between ferromagnetic couping in LaMnO3 layer and antiferromagnetic coupling in LaFeO_3 layer.
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