2011 Fiscal Year Final Research Report
Optical control of local ferroelectric polarity
| Project/Area Number |
23656219
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Electronic materials/Electric materials
|
|---|
| Research Institution | Osaka University |
|---|
Principal Investigator |
TONOUCHI Masayoshi 大阪大学, レーザーエネルギー学研究センター, 教授 (40207593)
|
|---|
| Project Period (FY) |
2011
|
| Keywords | テラヘルツ放射 / 強誘電分極 / ナノドメイン |
|---|
| Research Abstract |
We studied the temperature dependence of the dielectric dispersion of SrTiO3 thin films on MgAl2O4 by broadband THz-TDS and we found evidence of a ferroelectric phase transition at around 170 K. Furthermore, the increase ofε" in the gigahertz frequency region and the increase ofγTO1 below T_c imply the existence of polar nanoregions that have been observed in other ferroelectric materials with a perovskite structure and relaxor ferroelectrics.
|
