Magnetic imaging of individual modulated cylindrical nanowires

Bran, Cristina; Vázquez, M.; Berganza, Eider; Jaafar, Miriam; Snoeck, E.; Asenjo, A.

doi:10.1016/b978-0-08-102832-2.00016-5

Cited by 3 publications

(2 citation statements)

References 118 publications

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“…The nanowires were prepared by a two-step electrochemical anodization process, followed by the electrodeposition of Ni. This technique allows for obtaining anisotropic magnetic nanowires with a very-well-controlled size and diameter. , The NiNws embedded in the AAO template can be visualized in Figure a showing an average length of 7 μm. The nanowires were then disintegrated from the AAO template using an etching solution, resulting in stand-alone nonordered NiNws (Figure b).…”

Section: Resultsmentioning

confidence: 99%

Magnetoelectric Polymer-Based Nanocomposites with Magnetically Controlled Antimicrobial Activity

Fernandes

Martins

Correia

et al. 2021

ACS Appl. Bio Mater.

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The emergence of antimicrobial resistance is considered a public health problem due to the overuse and misuse of antibiotics which are losing efficacy toward an increasing number of microorganisms. Advanced antimicrobial strategies via development of alternative drugs and materials able to control microbial infections, especially in clinical settings, are urgently needed. In this work, nanocomposite films were developed from the piezoelectric polyvinylidene fluoride (PVDF) polymer, filled with nickel nanowires (NiNws) in an attempt to control and enhance the antimicrobial activity of the materials via applying a magnetic stimulus. The material was achieved through crystallization of PVDF in the electroactive βphase upon incorporation of anisotropic and negatively charged NiNws in the polymeric matrix at a concentration of 1.5 wt %. The nanocomposites have shown to possess certain antimicrobial properties, which could be considerably boosted through the application of a magnetic field. In fact, more than 55% of bacterial growth inhibition was obtained by employing controlled dynamic magnetic conditions for representative Gram-positive and Gram-negative bacteria, compared to only 25% inhibition obtained under static conditions, i.e., without magnetic stimuli application, with the antibiofilm activity clearly improved as well upon dynamic conditions. This work demonstrates a proof-of-concept for materials able to boost on demand their antimicrobial activity and opens the room for applications in novel medical devices with improved control of healthcare-associated infections.

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Section: Resultsmentioning

confidence: 99%

Magnetoelectric Polymer-Based Nanocomposites with Magnetically Controlled Antimicrobial Activity

Fernandes

Martins

Correia

et al. 2021

ACS Appl. Bio Mater.

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“…In this scenario, understanding the specific mechanism that triggers the magnetization reversal process of complex nanostructures is crucial for the development of applications that require precise control of magnetization switching. With this aim, several techniques offer access to local magnetization and its dynamics [18], such as magnetic force microscopy (MFM) [19], magneto-optic Kerr effect (MOKE) [20], Lorentz microscopy [21], holography [22], X-ray magnetic circular dichroism coupled with photoemission electron microscopy (XMCD-PEEM) [23], or magnetotransport measurements [24], which are used to investigate the spin configuration of individual nanostructures and their dynamics, and are largely supported by micromagnetic modeling.…”

Section: Introductionmentioning

confidence: 99%

Distinguishing Local Demagnetization Contribution to the Magnetization Process in Multisegmented Nanowires

et al. 2022

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Cylindrical magnetic nanowires are promising materials that have the potential to be used in a wide range of applications. The versatility of these nanostructures is based on the tunability of their magnetic properties, which is achieved by appropriately selecting their composition and morphology. In addition, stochastic behavior has attracted attention in the development of neuromorphic devices relying on probabilistic magnetization switching. Here, we present a study of the magnetization reversal process in multisegmented CoNi/Cu nanowires. Nonstandard 2D magnetic maps, recorded under an in-plane magnetic field, produce datasets that correlate with magnetoresistance measurements and micromagnetic simulations. From this process, the contribution of the individual segments to the demagnetization process can be distinguished. The results show that the magnetization reversal in these nanowires does not occur through a single Barkhausen jump, but rather by multistep switching, as individual CoNi segments in the NW undergo a magnetization reversal. The existence of vortex states is confirmed by their footprint in the magnetoresistance and 2D MFM maps. In addition, the stochasticity of the magnetization reversal is analysed. On the one hand, we observe different switching fields among the segments due to a slight variation in geometrical parameters or magnetic anisotropy. On the other hand, the stochasticity is observed in a series of repetitions of the magnetization reversal processes for the same NW under the same conditions.

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Decoding of 23 Unique Magnetic Nanobarcodes

Kouhpanji

Stadler

2022

IEEE Trans. Magn.

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Magnetic imaging of individual modulated cylindrical nanowires

Cited by 3 publications

References 118 publications

Magnetoelectric Polymer-Based Nanocomposites with Magnetically Controlled Antimicrobial Activity

Magnetoelectric Polymer-Based Nanocomposites with Magnetically Controlled Antimicrobial Activity

Distinguishing Local Demagnetization Contribution to the Magnetization Process in Multisegmented Nanowires

Decoding of 23 Unique Magnetic Nanobarcodes

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