Microstructural analysis of functional materials with hierarchical structrure

2014 Fiscal Year Final Research Report

• Project/Area Number: 25610076
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics I
• Research Institution: Osaka Prefecture University
• Principal Investigator: MORI SHIGEO 大阪府立大学, 工学(系)研究科(研究院), 教授 (20251613)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 透過型電子顕微鏡 / ローレンツ顕微鏡法 / 小角電子線散乱 / 誘電体

Outline of Final Research Achievements

(1)A novel electron optical system for obtaining both small-angle electron (SAE) diffraction patterns and Foucault images has been constructed using conventional transmission electron microscope. The Foucault images in magnetic domains of La0.825Sr0.175MnO3 exhibit regularly ordered stripe pattern and the SAE pattern consisted of diffraction spots due to the periodic array of magnetic stripes and diffuse streaks due to the Bloch-type magnetic walls. It revealed that, by applying magnetic field, magnetic stripes transformed into magnetic bubbles. (2) A HAADF-STEM imaging technique was applied to the investigation of domain structures in the ferroelectric phase of YMnO3, at the atomic scale. Two types of domain walls should be identified in the ferroelectric domain structures. One is the charged longitudinal domain walls with head-to-head or tail-to-tail configuration and the other is non-charged transverse domain walls with head-to-tail configuration.

Free Research Field

構造物性