Oscillatory structure with a frequency of THz range using ferroelectric polarization and the enhancement by electric field

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K14235
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Electronic materials/Electric materials
• Research Institution: Osaka Prefecture University
• Principal Investigator: Norifumi Fujimura 大阪府立大学, 工学(系)研究科(研究院), 教授 (50199361)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: THz発振 / 強相関係物質 / 強誘電体 / 光誘起電流

Outline of Final Research Achievements

By monitoring the optical emission from the plasma during deposition, excellent epitaxial films of YbFe2O4, YMnO3, BiFeO3 were successfully obtained. Novel phenomena such as photo-induced current and spin modulation were clearly recognized in YbFe2O4, fims. For the YMnO3 films, the relationship between photo-induced current and polarization switching and an oscillatory structure with a frequency of 5.1 THz, which is assigned to the coherent optical phonon with A1 symmetry. The oscillatory structure with a frequency 0.58 originated from magnon was observed as well. In the case of BiFeO3 epitaxial fims, the oscillatory structure with a frequency of 2.5 THz by coherent optical phonon was recognized.

Free Research Field

固体物性、酸化物エレクトロニクス