Place : IRIG/SPINTEC, auditorium 445 CEA Building 10.05 (presential access to the conference room at CEA in Grenoble requires an entry authorization. Request it before April 29th at admin.spintec@cea.fr)
video conference : https://univ-grenoble-alpes-fr.zoom.us/j/98769867024?pwd=dXNnT3RMeThjYStybGVQSUN0TVdJdz09
Meeting ID: 987 6986 7024
Passcode: 025918
Abstract : Chiral crystals with well-defined handedness in atomic arrangements exhibit intriguing properties such as spin selectivity, asymmetric magnetoresistance, and skyrmions. Although similar geometry-induced phenomena have been observed in chiral organic-molecule-based systems, synthesizing uniform inorganic nanostructures with desired chirality using a scalable method remains challenging. We electrochemically synthesized 3D chiral ferromagnetic cobalt-iron nanohelices from nanoparticles in anodized aluminum oxide templates. The spiral directions and the number of strands were regulated by incorporating chiral molecules and applying an appropriate potential. We demonstrate the observation of Faraday’s law of induction at the nanoscale and how chiral nanohelices regulate the direction of electron flow. The implications of our findings extend to the technological realm, particularly in the context of charity and ferromagnetism-based spin-tunable devices.
Reference:
Y. S. Jeon et al., Science 389. 1031-1036 (2025).
https://doi.org/10.1126/science.adx5963
Biography : Professor Kim has been working in the Department of Materials Science and Engineering at Korea University, Seoul, Korea, since 2000. He is a Fellow of the Korean Academy of Science and Technology (KAST) and a Member of the National Academy of Engineering of Korea (NAEK). He received the BS (1985) and MS (1987) degrees in Metallurgical Engineering from Seoul National University and the PhD degree (1993) in Materials Science and Engineering from MIT, USA. Before joining Korea University, he worked for Quantum Corporation in the USA and Samsung Electro-Mechanics in Korea. Prof. Kim received the Order of Science and Technology Merit (Ungbi Medal) in April 2026 and the Order of Service Merit (Green Stripe Medal) in June 2017, awarded by the Government of the Republic of Korea. He is the recipient of all three major awards of Korea University: The Research Awards in 2022 and 2021, the Technology Award in 2016, and the Teaching Award in 2005. Prof. Kim received the Kang II-Koo∙Hyundai BNG Steel Award in 2025 and the Amo Award in 2019 from the Korean Magnetics Society (KMS), and the Iljin Academic Achievement Award from the Korean Institute of Metals and Materials (KIM) in 2015. He served as the President of the Korean Magnetics Society (KMS), the Asian Union of Magnetics Societies (AUMS), and the Korean Institute of Metals and Materials (KIM). He is currently the General Chair of IEEE Intermag 2027 Jeju. He has published over 330 peer-reviewed journal papers, holds over 150 registered patents, and has delivered over 150 invited talks. Prof. Kim’s research interests include the development of novel magnetic thin films and nanostructured materials for spintronic memory devices, semiconductor metallization, and biomedical and sustainability applications.