| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
The research project has investigated crystalline materials in which two important properties coexist: ferroelectricity (centers of positive and negative atomic charges are always separated, creating permanent electric dipoles or polarization that can be controlled by external electric field) and ferromagnetism (electrons of certain atoms in the crystal arrange themselves so that their magnetic dipole of spin are uncompensated and aligned). We have studied crystals in the family of BiFeO3. Our atomistic calculations have shown that we can control the atomic displacements (that yield a large/small polarization) by changing the way we fill up the electronic shells of Fe (thus creating a large/small magnetization). Our research revealed that for obtaining large magnetism and ferroelectricity, coupled to each other at room temperature, some exotic crystal symmetries or BiFeO3 (that are normally difficult to stabilize) should be promoted by careful selection of the fabrication conditions.
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