| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2019: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2018: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2017: ¥10,530,000 (Direct Cost: ¥8,100,000、Indirect Cost: ¥2,430,000)
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| Outline of Final Research Achievements |
In this work, we aim to overcome the critical nano-dimensions where material functionality disappears and discover ultra-small magnetic ferroelectrics (multiferroics). We perform first-principles density-functional theory calculations to reveal the low-dimensional and atomic-scale ferroelectricity and magnetism appeared at lattice defects. The magnetic and ferroelectric properties localized to the defects are observed in the point defects, such as vacancies and anti-site defects, and in the line defects such as dislocation cores, and the single-atom scale multiferroics are successfully found. We also show that such lattice-defect properties can be controlled by external mechanical loading. Furthermore, by constructing a mechanics model to describe these lattice defect functions, we have succeeded in analyzing the phenomena of complex systems consisting of multiple lattice defects.
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