Magnetic properties of a two-dimensional spatially ordered array of nickel nanowires

Grigoriev, S. V.; Chumakov, Andrei; Syromyatnikov, A. V.; Grigorieva, Natalia A.; Okorokov, A. I.; Napolskii, K. S.; Roslyakov, Ilya V.; Eliseev, A. A.; Lukashin, A. V.; Eckerlebe, H.

doi:10.1134/s1063783410050392

Cited by 10 publications

(5 citation statements)

References 9 publications

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“…Even though Ni NWs have been used for various applications in biology, including cell and protein separation, − the biocompatibility and cytotoxicity of Ni nanoparticles is still under investigation. Magnetic properties of the Ni NWs have been extensively investigated by many groups. − They are expected to be useful in high-density magnetic data storage.…”

Section: Introductionmentioning

confidence: 99%

Pristine and Hybrid Nickel Nanowires: Template-, Magnetic Field-, and Surfactant-Free Wet Chemical Synthesis and Raman Studies

2011

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Nickel nanowires of high purity and various aspect ratios were synthesized by a wet chemical reduction method without the assistance of surfactants, templates, and external magnetic field. The observed unique optical absorption features of nickel nanowires are highly dependent on the nanowire dimensions. In order to tailor the physical and chemical properties of the nanowires, we have incorporated functionalities in the form of tellurium and zinc oxide coating on them by overgrowth processes using simple wet chemical reactions. The pristine and functional nanowires were characterized by different microscopic and spectroscopic techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), confocal Raman microscopy, X-ray diffraction spectroscopy (XRD), and UV-visible spectroscopy. Our system provides additional details into the growth of anisotropic Ni nanowires, especially in the absence of surfactants, templates, and external magnetic field. We have also demonstrated surface-enhanced Raman scattering (SERS) activity of the Ni nanowires using crystal violet as the probe molecule.

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Section: Introductionmentioning

confidence: 99%

Pristine and Hybrid Nickel Nanowires: Template-, Magnetic Field-, and Surfactant-Free Wet Chemical Synthesis and Raman Studies

2011

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“…Various uncertainties may come into play in this estimate: pores which may not be totally filled, the uniformity of the pore dimensions, the effective depth of the membranes, etc., so that an error of 10-15 should be considered. If the magnetization is not uniform inside and/or outside the nanowires, e.g., due to end domains, or stray or demagnetizing fields [27,48,49], then one should consider χ(q) in its generality:…”

Section: Core-shell Cylindermentioning

confidence: 99%

“…Here, we show that PSANS is a tool to characterize, both structurally and magnetically, anisotropicmagnetic nano-objects.With unpolarized neutrons, it is possible to disentangle the structure factor of the array and the nuclear form factor of a single wire. In previous studies, focused on Co and Ni nanowires ordered in Al 2 O 3 membranes but with the external magnetic field applied perpendicular to the wire long axis [25,27,48], the variation of the SANS intensity depending on the applied magnetic field reveals that stray fields have to be taken into account in the magnetic formfactor derivation. In the polarized-neutrons case, we show that it is possible to derive directly from experiment the magnetic form factor, and therefore the magnetization distribution in the sample.…”

mentioning

confidence: 99%

Ordered arrays of magnetic nanowires investigated by polarized small-angle neutron scattering

et al. 2014

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Polarized small-angle neutron scattering (PSANS) experimental results obtained on arrays of ferromagnetic Co nanowires (φ ≈ 13 nm) embedded in self-organized alumina (Al2O3) porous matrices are reported. The triangular array of aligned nanowires is investigated as a function of the external magnetic field with a view to determine experimentally the real space magnetization M ( r) distribution inside the material during the magnetic hysteresis cycle. The observation of field-dependentSANSintensities allows us to characterize the influence of magnetostatic fields. The PSANS experimental data are compared to magnetostatic simulations. These results evidence that PSANS is a technique able to address real-space magnetization distributions in nanostructured magnetic systems. We show that beyond structural information (shape of the objects, two-dimensional organization) already accessible with nonpolarized SANS, using polarized neutrons as the incident beam provides information on the magnetic form factor and stray fields μ0Hd distribution in between nanowires.

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“…To overcome these drawbacks, small-angle X-ray scattering (SAXS) or neutrons scattering techniques can be applied. The value of these methods in the structural analysis of AAO porous films and AAO-based nanocomposites has been proven more than once. − In addition to high statistics, acquired from millimeter-sized irradiation area, these approaches provide unique information about longitudinal (out-of-plane) pore arrangement. − Moreover, the extreme brilliance of modern synchrotron sources allows one to directly characterize the formation of various nanosystems. − In 2011, the first in situ studies of aluminum anodizing by SAXS shed light on the kinetics and mechanism of pore ordering in AAO grown on polycrystalline substrates …”

Section: Introductionmentioning

confidence: 99%

Evolution of Pore Ordering during Anodizing of Aluminum Single Crystals:In SituSmall-Angle X-ray Scattering Study

et al. 2021

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Self-organization of pores in anodic aluminum oxide (AAO) is a unique phenomenon attracting significant interest from both fundamental and practical points of view. Although the influence of crystallographic orientation of Al substrate on the degree of pore ordering has been clearly demonstrated, the information about the kinetics of selforganization in AAO formed on various low-index facets of Al is absent. Here, the kinetics of pore ordering during anodizing of lowindex surfaces of Al single crystals is studied by using the in situ small-angle X-ray scattering technique. The fastest decrease in the dispersion of pore growth direction is found in the case of anodizing of the Al(100) substrate. To obtain the comparable outof-plane pore ordering in the case of Al( 111) anodizing, the charge density should be doubled. On the contrary, on the Al(111) the fastest kinetics of in-plane orientational pore ordering is observed. The average domain size in the AAO films grown on Al(100) and Al( 110) is limited by about 20 lattice periods, whereas the unlimited growth of the domains is observed in the case of the Al(111) substrate. The pore organization into hexagonal domains is found to be much faster than the development of long-range in-plane orientational pore order.

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Magnetic properties of a two-dimensional spatially ordered array of nickel nanowires

Cited by 10 publications

References 9 publications

Pristine and Hybrid Nickel Nanowires: Template-, Magnetic Field-, and Surfactant-Free Wet Chemical Synthesis and Raman Studies

Pristine and Hybrid Nickel Nanowires: Template-, Magnetic Field-, and Surfactant-Free Wet Chemical Synthesis and Raman Studies

Ordered arrays of magnetic nanowires investigated by polarized small-angle neutron scattering

Evolution of Pore Ordering during Anodizing of Aluminum Single Crystals:In SituSmall-Angle X-ray Scattering Study

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