Magnetization reversal of ferromagnetic nanosprings affected by helical shape

Da Yeon Nam, Aleksei Yu Samardak, Yoo Sang Jeon, Su Hyo Kim, Alexander V. Davydenko, Alexey V. Ognev, Alexander S. Samardak, Young-geun Kim

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Helicity, a natural property of macro-, micro-, and nano-objects, potentially offers a new dimension to mechanical and electromagnetic applications for creating emerging nanodevices, such as nanorobots, nanomagnets, nanosensors, and high-density magnetic memory. Helical magnetic nanosprings are unique objects with remarkable magnetic properties, including the absence of stray fields in remanence owing to the chiral geometry, which makes them promising for data storage devices, nanoelectromechanical systems, and biomedical usage. Here, we investigated Co and CoFe nanospring arrays electrodeposited in highly ordered nanoporous templates. We report helical-shape-driven magnetization reversal of the nanosprings in comparison with the behavior of dipolarly coupled nanowires. We reveal two magnetization reversal modes depending on the orientation of the external magnetic field: coherent rotation of magnetization in the longitudinal geometry and three-dimensional vortex domain wall motion in the transverse geometry. The experimental findings are supported by analytical calculations and micromagnetic simulations that help to explain the field-dependent spin configurations observed by magnetic force microscopy.

Original languageEnglish
Pages (from-to)20405-20413
Number of pages9
JournalNanoscale
Volume10
Issue number43
DOIs
Publication statusPublished - 2018 Nov 21

ASJC Scopus subject areas

  • Materials Science(all)

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    Nam, D. Y., Samardak, A. Y., Jeon, Y. S., Kim, S. H., Davydenko, A. V., Ognev, A. V., Samardak, A. S., & Kim, Y. (2018). Magnetization reversal of ferromagnetic nanosprings affected by helical shape. Nanoscale, 10(43), 20405-20413. https://doi.org/10.1039/c8nr05655b