ECE Seminar - Chiromagnetics: Spin-Selective Transport Through Chiral Ferromagnetic Nanohelices
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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 in chiral organic molecule-based systems were observed, synthesizing uniform inorganic nanostructures with desired chirality using a scalable method remains challenging. We electrochemically synthesized 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.
References
1. Y. S. Jeon and E. Jeong et al., Science 389. 1031-1036 (2025).
https://doi.org/10.1126/science.adx5963
2. Y. S. Jeon et al., Nano Today 42, 101348 (2022).
Professor Kim has worked in the Department of Materials Science and Engineering at Korea University, Seoul, Korea, since 2000. He has also been an Adjunct Professor at the School of Medicine since 2016. Before joining Korea University, he worked for Quantum Corporation in the USA and Samsung Electro-Mechanics in Korea. Prof. Kim received the Korean government’s National Order of Service Merit-Green Stripes in June 2017. He is the recipient of all three major awards at Korea University: The Research Award 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 KMS. He received the Iljin Academic Achievement Award from KIM in 2015. He has published over 330 peer-reviewed journal papers and invented over 170 registered patents. Prof. Kim’s research interests include the development of novel magnetic thin films and nanostructured materials for spintronic memory devices, semiconductor metallization, and sustainability applications.