Programmable Locomotion Mechanisms of Nanowires with Semihard Magnetic Properties Near a Surface Boundary
- Authors
- Jang, Bumjin; Hong, Ayoung; Alcantara, Carlos; Chatzipirpiridis, George; Martí, Xavier; Pellicer, Eva; Sort, Jordi; Harduf, Yuval; Or, Yizhar; Nelson, Bradley J.; Pané, Salvador
- Issue Date
- Jan-2019
- Publisher
- American Chemical Society
- Keywords
- boundary effect; CoPt nanowires; motion transition; nanopropulsion; semihard magnetic properties
- Citation
- ACS Applied Materials & Interfaces, v.11, no.3, pp 3214 - 3223
- Pages
- 10
- Indexed
- SCI
SCIE
SCOPUS
- Journal Title
- ACS Applied Materials & Interfaces
- Volume
- 11
- Number
- 3
- Start Page
- 3214
- End Page
- 3223
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/114372
- DOI
- 10.1021/acsami.8b16907
- ISSN
- 1944-8244
1944-8252
- Abstract
- 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. © 2018 American Chemical Society.
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