ADVANCED ELECTRON
MICROSCOPY & FUNCTIONAL
IMAGING LABORATORY

Our research focuses on the application of aberration-corrected
STEM with emphasis on the unprecedented atomic scale imaging
techniques aimed at unraveling and understanding the various material
property-dependent device performance.

For several decades, studying materials microstructure was quite challenging as majority of the research works were theoretical. More importantly, providing direct evidence of the atomic scale evolution of material property was nearly impossible due to the limited analysis tools and techniques. However, with the invention of the new analysis and interpretational techniques, elucidating the correlation between material nanostructure and device characteristics has become crucial for the development of novel materials. Our research focuses on the application of aberration-corrected STEM with emphasis on the unprecedented atomic scale imaging techniques aimed at unraveling and understanding the various material property-dependent device performance. In-depth investigation of the various phenomena such as atomic-scale visualization of antisite defects such as those observed in LiFePO4 are tackled.

RESEARCH INTEREST

PUBLICATIONS

  • Yongjoo Jo, Younji Kim, Sanghyeon Kim, Eunjo Ryoo, Gahee Noh, Gi-Jeong Han, Ji Hye Lee*, Won Joon Cho*, Gil-Ho Lee, Si-Young Choi*, and Daesu Lee*, “Field-Free Spin-Orbit Torque Magnetization Switching in a Single-Phase Ferromagnetic and Spin Hall Oxide”, Nano Letters XX, XXXX (2024) [pdf]

  • Jin Wook Lim, Dong Heon Choo, Jin Hyuk Cho, Jaehyun Kim, Won Seok Cho, Odongo Francis Ngome Okello, Kisoo Kim, Sungwon Lee, Junwoo Son, Si-Young Choi, Jong Kyu Kim, Ho Won Jang*, Soo Young Kim*, and Jong-Lam Lee*, “A MOF-derived pyrrolic N-stabilized Ni single atom catalyst for selective electrochemical reduction of CO2 to CO at high current density”, Journal of Materials Chemistry A 12, 11090 (2024) [pdf]

  • Chaehwa Jeong, Juhyeok Lee, Hyesung Jo, Jaewhan Oh, Hionsuck Baik, Kyoung-June Go, Junwoo Son, Si-Young Choi, Sergey Prosandeev, Laurent Bellaiche and Yongsoo Yang*, “Revealing the three-dimensional arrangement of polar topology in nanoparticles”, Nature Communications 15, 3887 (2024) [pdf]

  • Jinhyuk Jang and Si-Young Choi*, "Reduced dimensional ferroelectric domains and their characterization techniques", Microstructures 4, 2024016 (2024) [pdf]

  • Dong Kyu Lee, Sungwon Lee, Hyeji Sim, Yunkyu Park, Si-Young Choi, and Junwoo Son*, "Piezo strain-controlled phase transition in single-crystalline Mott switches for threshold-manipulated leaky integrate-and-fire neurons", Science Advances 10, eadk8836 (2024) [pdf]