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).
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More information :https://www.spintec.fr/seminar-3d-chiral-spintronics-spin-selective-transport-through-chiral-magnetic-nanohelices/​​
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Visioconference : https://univ-grenoble-alpes-fr.zoom.us/j/98769867024?pwd=dXNnT3RMeThjYStybGVQSUN0TVdJdz09​​​