2006 Fiscal Year Final Research Report Summary
Creation of ferroelectric relaxor superlattices with symmetry braking and brain mimetic memory
| Project/Area Number |
16360154
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Electronic materials/Electric materials
|
|---|
| Research Institution | The University of Tokyo (2006)
Osaka University (2004-2005) |
|---|
Principal Investigator |
TABATA Hitoshi The University of Tokyo, Department of Electronic Engineering, Professor (00263319)
|
|---|
| Project Period (FY) |
2004 – 2006
|
| Keywords | relaxor / artificial superlattices / spinglass / spinel / garnet |
|---|
| 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 to control the three dimensional 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 LaMnO_3/LaFeO_3 superlattices, on the other hand, spin frustration is expected competing with ferromagnetism of self-doped LaMnO_3 and anti-ferromagnetism of LaFeO_3 on SrTiO_3 (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 LaMnO_3 layer and antiferromagnetic coupling in LaFeO_3 layer.
|
