Professor

Kenji Tsuda

Assistant Professor

Daisuke Morikawa

Nanoscale local crystal structure and electrostatic potential analysis using nano-electron probe

Local crystal structure analysis is increasingly important in functional materials that exhibit intriguing physical properties induced by nanoscale local structures and crystal interfaces. For this purpose, the convergent-beam electron diffraction (CBED) method using nano-electron probe is extremely advantageous. Using the CBED method, we developed a quantitative analysis method of local structures and electrostatic potential distributions based on the dynamical diffraction (multiple scattering) theory, and applied it to various functional materials. Furthermore, we are developing a method to investigate spatial variations of local structures and electrostatic potential distributions in crystal interfaces and nanodomain structures by using the STEM-CBED/4D-STEM method.

Themes

• Development of local crystal structure and electrostatic potential analysis and its applications
• Local structure and electrostatic potential analysis of crystal interface and nanodomain structures using 4D-STEM
• Nanoscale local crystal structure analysis of functional materials under applying external fields
• Nanoscale local crystal structure analysis at structural phase transformations
• Advanced electron holography and Lorentz microscopy for nanoscale electromagnetic field measurements