Programmable Locomotion Mechanisms of Nanowires with Semihard Magnetic Properties Near a Surface Boundary

Bumjin Jang, Ayoung Hong, Carlos Alcantara, George Chatzipirpiridis, Xavier Martí, Eva Pellicer, Jordi Sort, Yuval Harduf, Yizhar Or, Bradley J. Nelson, Salvador Pané

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Abstract

© 2018 American Chemical Society. We report on the simplest magnetic nanowire-based surface walker that is able to change its propulsion mechanism near a surface boundary as a function of the applied rotating magnetic field frequency. The nanowires are made of CoPt alloy with semihard magnetic properties synthesized by means of template-assisted galvanostatic electrodeposition. The semihard magnetic behavior of the nanowires allows for programming their alignment with an applied magnetic field as they can retain their magnetization direction after premagnetizing them. By engineering the macroscopic magnetization, the nanowires' speed and locomotion mechanism are set to tumbling, precession, or rolling depending on the frequency of an applied rotating magnetic field. Also, we present a mathematical analysis that predicts the translational speed of the nanowire near the surface, showing a very good agreement with experimental results. Interestingly, the maximal speed is obtained at an optimal frequency (∼10 Hz), which is far below the theoretical step-out frequency (∼345 Hz). Finally, vortices are found by tracking polystyrene microbeads, trapped around the CoPt nanowire, when they are propelled by precession and rolling motion.
Original languageEnglish
Pages (from-to)3214-3223
JournalACS Applied Materials and Interfaces
Volume11
DOIs
Publication statusPublished - 23 Jan 2019

Keywords

  • boundary effect
  • CoPt nanowires
  • motion transition
  • nanopropulsion
  • semihard magnetic properties

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    Jang, B., Hong, A., Alcantara, C., Chatzipirpiridis, G., Martí, X., Pellicer, E., Sort, J., Harduf, Y., Or, Y., Nelson, B. J., & Pané, S. (2019). Programmable Locomotion Mechanisms of Nanowires with Semihard Magnetic Properties Near a Surface Boundary. ACS Applied Materials and Interfaces, 11, 3214-3223. https://doi.org/10.1021/acsami.8b16907