Spin-selective transport through chiral ferromagnetic nanohelices

• 成果类型: Article
• 署名作者: Jeon, Yoo Sang; Jeong, Eunjin; Im, Sang Won; Ko, Min Jun; Lee, Jin Seo; Moon, Jun Hwan; Lee, Min Hyeok; Lee, Jeong Kyu; Yoo, Sung Jong; Nam, Ki Tae; Kim, Young Keun
• 署名单位: Korea University; Korea University; Seoul National University (SNU); Northwestern University; Feinberg School of Medicine; Korea University; Korea Institute of Science & Technology (KIST)
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8075; 1095-9203
• DOI: 10.1126/science.adx5963
• 发表日期: 2025-09-04
• 页码: 1031-1036
• 关键词: ELECTRODEPOSITION; GROWTH

摘要

Chiral crystals with well-defined handedness in atomic arrangements exhibit 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 show how chiral nanohelices regulate the electron flow direction. The implications of our findings extend to the technological realm, with chirality- and ferromagnetism-based spin-tunable devices.