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

  • Hyunseok Song†, Soo-Yoon Hwang†, Kil-Dong Sung†, Xiaoxing Cheng, Jong Hoon Jung, Jung-Min Park, Ashok Kumar, Kee Hoon Kim, Sung-Yoon Chung, Seung-Wook Kim, Long-Qing Chen, Chang-Beom Eom, Dae-Yong Jeong*, Si-Young Choi* and Jungho Ryu* († equally contributed authors), "Localized Flexoelectric Effect Around Ba(CuNb) Nano-Clusters in Epitaxial BiFeO3 Films for Enhancement of Electric and Multiferroic Properties", Advanced Functional Materials XX, XX (2024) [pdf]

  • Muhammad Sheeraz†, Chang Won Ahn†, Nguyen Xuan Duong†, Soo-Yoon Hwang†, Ji-Soo Jang, Eun-Young Kim, Yoon Ki Kim, Jaeyeong Lee, Jong Sung Jin, Jong-Seong Bae, Myang Hwan Lee, Hyoung-Su Han, Gi-Yeop Kim, Shinuk Cho, Tae Kwon Song, Sang Mo Yang, Sang Don Bu, Seung-Hyub Baek, Si-Young Choi*, Ill Won Kim* and Tae Heon Kim* († equally contributed authors), "ProtonationDriven Polarization Retention Failure in Nano-Columnar Lead-Free Ferroelectric Thin Films", Advanced Science XX, XX (2024) [pdf]

  • Heung-Sik Park, Jinhyuk Jang, Ji Soo Lim, Jeonghun Suh, Si-Young Choi and Chan-Ho Yang*, "Oxygen vacancy order-disorder transition process during topotactic filament formation in a perovskite oxide tracked by Raman microscopy and transmission electron microscopy", Applied Physics Reviews 11, 041406 (2024) [pdf]

  • Sang J. Park, Phuoc Cao Van, Min-Gu Kang, Hyeon-Jung Jung, Gi-Yeop Kim, Si-Young Choi, Jung-Woo Yoo, Byong-Guk Park, Se Kwon Kim*, Jong-Ryul Jeong* and Hyungyu Jin*, "Enhancing spin pumping by nonlocal manipulation of magnon temperature", Matter XX, XX (2024) [Accepted] [html]

  • Youngki Yeo, Jihun Kim, Jeonghun Suh, Jinhyuk Jang, Kyungrok Kang, Peggy Schoenherr, Kwang-Tak Kim, Yong-Jin Kim, Kee Hoon Kim, Clemens Ulrich, Jan Seidel, Si-Young Choi and Chan-Ho Yang*, "Exploring the Possibility of Thermally Assisted Creation and Annihilation of Anti-Frenkel Defects in a Multiferroic Oxide for Tuning Interfacial Ferroelectricity", Advanced Materials Interfaces 11, 2400027 (2024) [pdf]