| Budget Amount *help |
¥16,900,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥3,900,000)
Fiscal Year 2016: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2015: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2014: ¥10,010,000 (Direct Cost: ¥7,700,000、Indirect Cost: ¥2,310,000)
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| Outline of Final Research Achievements |
In this study, novel ferroelectric and ferromagnetic ordering emerged in low-dimensional nanoscale multiferroics is analyzed using first-principles calculations based on quantum-mechanics theory. In nanowires, for exmaples, both ferroelectric polarization and magnetic moment form a spiral way, i.e., double-helix structures. This is due to both depolarizing field due to surface charges and unique bonding formed in nanostructures. In addition, such helical ferroelectric and magnetic polarizations can be switched by mechanical torsion, suggesting that there exists unique coupling among mechanical, ferroelectric, and magnetic properties, i.e., multi-physics properties in nanostructures.
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