Narrow Segment Driven Multistep Magnetization Reversal Process in Sharp Diameter Modulated Fe<sub>67</sub>Co<sub>33</sub> Nanowires
Magnetic nanomaterials are of great interest due to their potential use in data storage, biotechnology, or spintronic based devices, among others. The control of magnetism at such scale entails complexing the nanostructures by tuning their composition, shape, sizes, or even several of these properti...
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2021
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oai:doaj.org-article:507a68939e9541d6927975ceb9cbbc5e2021-11-25T18:32:16ZNarrow Segment Driven Multistep Magnetization Reversal Process in Sharp Diameter Modulated Fe<sub>67</sub>Co<sub>33</sub> Nanowires10.3390/nano111130772079-4991https://doaj.org/article/507a68939e9541d6927975ceb9cbbc5e2021-11-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/3077https://doaj.org/toc/2079-4991Magnetic nanomaterials are of great interest due to their potential use in data storage, biotechnology, or spintronic based devices, among others. The control of magnetism at such scale entails complexing the nanostructures by tuning their composition, shape, sizes, or even several of these properties at the same time, in order to search for new phenomena or optimize their performance. An interesting pathway to affect the dynamics of the magnetization reversal in ferromagnetic nanostructures is to introduce geometrical modulations to act as nucleation or pinning centers for the magnetic domain walls. Considering the case of 3D magnetic nanowires, the modulation of the diameter across their length can produce such effect as long as the segment diameter transition is sharp enough. In this work, diameter modulated Fe<sub>67</sub>Co<sub>33</sub> ferromagnetic nanowires have been grown into the prepatterned diameter modulated nanopores of anodized Al<sub>2</sub>O<sub>3</sub> membranes. Their morphological and compositional characterization was carried out by electron-based microscopy, while their magnetic behavior has been measured on both the nanowire array as well as for individual bisegmented nanowires after being released from the alumina template. The magnetic hysteresis loops, together with the evaluation of First Order Reversal Curve diagrams, point out that the magnetization reversal of the bisegmented FeCo nanowires is carried out in two steps. These two stages are interpreted by micromagnetic modeling, where a shell of the wide segment reverses its magnetization first, followed by the reversal of its core together with the narrow segment of the nanowire at once.Javier GarcíaJose A. Fernández-RoldánRoque GonzálezMiguel MéndezCristina BranVíctor VegaSilvia GonzálezManuel VázquezVíctor M. PridaMDPI AGarticleelectrodepositionmagnetic nanowiresdiameter modulationFORCmagnetization reversalMOKEChemistryQD1-999ENNanomaterials, Vol 11, Iss 3077, p 3077 (2021) |
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electrodeposition magnetic nanowires diameter modulation FORC magnetization reversal MOKE Chemistry QD1-999 |
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electrodeposition magnetic nanowires diameter modulation FORC magnetization reversal MOKE Chemistry QD1-999 Javier García Jose A. Fernández-Roldán Roque González Miguel Méndez Cristina Bran Víctor Vega Silvia González Manuel Vázquez Víctor M. Prida Narrow Segment Driven Multistep Magnetization Reversal Process in Sharp Diameter Modulated Fe<sub>67</sub>Co<sub>33</sub> Nanowires |
| description |
Magnetic nanomaterials are of great interest due to their potential use in data storage, biotechnology, or spintronic based devices, among others. The control of magnetism at such scale entails complexing the nanostructures by tuning their composition, shape, sizes, or even several of these properties at the same time, in order to search for new phenomena or optimize their performance. An interesting pathway to affect the dynamics of the magnetization reversal in ferromagnetic nanostructures is to introduce geometrical modulations to act as nucleation or pinning centers for the magnetic domain walls. Considering the case of 3D magnetic nanowires, the modulation of the diameter across their length can produce such effect as long as the segment diameter transition is sharp enough. In this work, diameter modulated Fe<sub>67</sub>Co<sub>33</sub> ferromagnetic nanowires have been grown into the prepatterned diameter modulated nanopores of anodized Al<sub>2</sub>O<sub>3</sub> membranes. Their morphological and compositional characterization was carried out by electron-based microscopy, while their magnetic behavior has been measured on both the nanowire array as well as for individual bisegmented nanowires after being released from the alumina template. The magnetic hysteresis loops, together with the evaluation of First Order Reversal Curve diagrams, point out that the magnetization reversal of the bisegmented FeCo nanowires is carried out in two steps. These two stages are interpreted by micromagnetic modeling, where a shell of the wide segment reverses its magnetization first, followed by the reversal of its core together with the narrow segment of the nanowire at once. |
| format |
article |
| author |
Javier García Jose A. Fernández-Roldán Roque González Miguel Méndez Cristina Bran Víctor Vega Silvia González Manuel Vázquez Víctor M. Prida |
| author_facet |
Javier García Jose A. Fernández-Roldán Roque González Miguel Méndez Cristina Bran Víctor Vega Silvia González Manuel Vázquez Víctor M. Prida |
| author_sort |
Javier García |
| title |
Narrow Segment Driven Multistep Magnetization Reversal Process in Sharp Diameter Modulated Fe<sub>67</sub>Co<sub>33</sub> Nanowires |
| title_short |
Narrow Segment Driven Multistep Magnetization Reversal Process in Sharp Diameter Modulated Fe<sub>67</sub>Co<sub>33</sub> Nanowires |
| title_full |
Narrow Segment Driven Multistep Magnetization Reversal Process in Sharp Diameter Modulated Fe<sub>67</sub>Co<sub>33</sub> Nanowires |
| title_fullStr |
Narrow Segment Driven Multistep Magnetization Reversal Process in Sharp Diameter Modulated Fe<sub>67</sub>Co<sub>33</sub> Nanowires |
| title_full_unstemmed |
Narrow Segment Driven Multistep Magnetization Reversal Process in Sharp Diameter Modulated Fe<sub>67</sub>Co<sub>33</sub> Nanowires |
| title_sort |
narrow segment driven multistep magnetization reversal process in sharp diameter modulated fe<sub>67</sub>co<sub>33</sub> nanowires |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/507a68939e9541d6927975ceb9cbbc5e |
| work_keys_str_mv |
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| _version_ |
1718411014801719296 |