Intrinsic Switching Field Distribution of Arrays of Ni80Fe20 Nanowires Probed by In Situ Magnetic Force Microscopy

Tabasum, M. R.; Zighem, F.; Piraux, Luc; Nysten, Bernard

doi:10.1007/s10948-012-1975-5

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…More importantly, these bulk techniques cannot determine the amount of sample being measured, 11 reducing the accuracy of an absolute magnetization measurement. Nanoscale methods with smaller transducers, such as single-particle magnetoresistance, 12,13 scanning probe magnetometry, [14][15][16] cantilever magnetometry, 17 and micro-SQUID magnetometry, 18 can resolve single particles, but do not typically provide quantitative magnetization information, have limited throughput, and are not readily applicable to measurements in the fluids in which nanoparticles are frequently used.…”

Section: Introductionmentioning

confidence: 99%

Quantitative magnetometry of ferromagnetic nanorods by microfluidic analytical magnetophoresis

Balk

Mair

Guo

et al. 2015

Journal of Applied Physics

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We introduce an implementation of magnetophoresis to measure the absolute magnetization of ferromagnetic nanorods dispersed in fluids, by analyzing the velocity of single nanorods under an applied magnetic field gradient. A microfluidic guideway prevents aggregation of nanorods, isolates them, and confines their motion for analysis. We use a three-dimensional imaging system to precisely track nanorod velocity and particle-surface proximity. We test the effect of the guideway on nanorod velocity under field gradient application, finding that it guides magnetophoresis, but imposes insignificant drag beyond that of a planar surface. This result provides insight into the transport of magnetic nanorods at microstructured interfaces and allows the use of an analytical model to accurately determine the reacted viscous drag in the force balance needed for quantitative magnetometry. We also estimate the confining potential of the guideway with Brownian motion measurements and Boltzmann statistics. We use our technique to measure the magnetization of ferromagnetic nanorods with a noise floor of 8.5 Â 10 À20 AÁm 2 ÁHz À 1 =2. Our technique is quantitative, rapid, and scalable for determining the absolute magnetization of ferromagnetic nanoparticles with high throughput. V

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Section: Introductionmentioning

confidence: 99%

Quantitative magnetometry of ferromagnetic nanorods by microfluidic analytical magnetophoresis

Balk

Mair

Guo

et al. 2015

Journal of Applied Physics

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“…Due to the large axial shape anisotropy, nanowires are usually taken to remain monodomain under axial-applied magnetic field. Therefore, investigations about individual nanowire-switching field and complex magnetostatic interaction between nanowires take advantages of the large template area that MFM can scan [62,63] (Figure 10a). Actually, this monodomain state can be directly observed by performing MFM imaging of free nanowires.…”

Section: Magnetic Force Microscopy (Mfm)mentioning

confidence: 99%

How to Characterize Cylindrical Magnetic Nanowires

Béron¹,

Santos²,

deCarvalho³

et al. 2016

Magnetic Materials

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Cylindrical magnetic nanowires made through the help of nanoporous alumina templates are being fabricated and characterized since the beginning of 2000. They are still actively investigated nowadays, mainly due to their various promising applications, ranging from high-density magnetic recording to high-frequency devices, passing by sensors, and biomedical applications. They also represent suitable systems in order to study the dimensionality effects on a given material. With time, the development in fabrication techniques allowed to increase the obtained nanowire complexity (controlled crystallinity, modulated composition and/or geometry, range of materials, etc.), while the improvements in nanomanipulation permitted to fabricate system based either on arrays or on single nanowires. On the other side, their increased complexity requires specific physical characterization methods, due to their particular features such as high anisotropy, small magnetic volume, dipolar interaction field between them, and interesting electronic properties. The aim of this chapter was to offer an ample overview of the magnetic, electric, and physical characterization techniques that are suitable for cylindrical magnetic nanowire investigation, of what is the specific care that one needs to take into account and which information will be extracted, with typical and varied examples.

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Study of the Switching Field Distribution and the S* Loop Squareness for Evaporated Fe Thin Films: Effect of Substrates and Thickness

Mebarki,

Layadi

2024

J Supercond Nov Magn

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Intrinsic Switching Field Distribution of Arrays of Ni80Fe20 Nanowires Probed by In Situ Magnetic Force Microscopy

Cited by 5 publications

References 13 publications

Quantitative magnetometry of ferromagnetic nanorods by microfluidic analytical magnetophoresis

Quantitative magnetometry of ferromagnetic nanorods by microfluidic analytical magnetophoresis

How to Characterize Cylindrical Magnetic Nanowires

Study of the Switching Field Distribution and the S* Loop Squareness for Evaporated Fe Thin Films: Effect of Substrates and Thickness

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