Study of the magnetization reversal in individual nickel nanowires

Pignard, S.; Goglio, Graziella; Radulescu, A.; Piraux, Luc; Dubois, S.; Declémy, A.; Duvail, Jean‐Luc

doi:10.1063/1.371947

Cited by 111 publications

(75 citation statements)

References 25 publications

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“…In this work, nickel nanowires and nanotubes are fabricated by using template-assisted electrochemical deposition process. Electrochemical deposition is a promising technique for the fabrication of nanostructures in a bottom-up trend and it does not require the employment of complex instrumentation [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of nickel nanowires and nanotubes using various templates

Ertan

Tewari

Talu

2008

Journal of Experimental Nanoscience

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Nickel nanotubes and nanowires are grown by galvanostatic electrodeposition in the pores of 1000, 100, and 15 nm polycarbonate as well as in anodised alumina membranes at a current density of 10 mA cm À2. The effects of pore size, porosity, electrodeposition time, effective current density, and pore aspect ratio are investigated. Nickel nanotube structures are obtained with 1000 nm pore size polycarbonate membrane without any prior treatment method. At the early stages of electrodeposition hollow nickel nanotubes are produced and nanotubes turn into nanowires at longer depositon times. As effective current density accounting for the membrane porosity decreases, the axial growth direction is favoured yielding nanowires rather than nanotubes. However, for smaller pore size polycarbonate membranes, nanowires are obtained even though effective current densities were higher. We believe that when the pore diameter is below a critical size, nanowires grow regardless of current density since narrow pores promote layer by layer growth of nanorods due to smaller surface area of the pore bottom compared to pore walls. Pore size has a dominant effect over effective current density in determining the structure of the fibres produced for small pores. Nickel nanowires are also obtained in the small pores of anodised alumina, which has higher aspect ratios. High aspect ratio membranes favour the fabrication of nanowires regardless of current density.

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Section: Introductionmentioning

confidence: 99%

Electrodeposition of nickel nanowires and nanotubes using various templates

Ertan

Tewari

Talu

2008

Journal of Experimental Nanoscience

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“…For example, electrodeposited Ni or Co nanowires with diameters between 30 nm and 90 nm were studied with micro-SQUID magnetometers 2 and subsequently by utilizing the anisotropic magnetoresistance (AMR) effect 3,8 . Experimental data from these measurements have been fitted to the curling mode, but difficulty arises due to the fact that the anisotropy energy from magnetocrystalline and/or other effects are comparable to the shape anisotropy 3,8 . Hence, the study of individual nanowires with one dominant anisotropy could provide further insight into the fundamental magnetization reversal process in such magnetic nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Magnetization reversal in elongated Fe nanoparticles

Xiong

Molnár

et al. 2005

Phys. Rev. B

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Magnetization reversal of individual, isolated high-aspect-ratio Fe nanoparticles with diameters comparable to the magnetic exchange length is studied by high-sensitivity submicron Hall magnetometry. For a Fe nanoparticle with diameter of 5 nm, the magnetization reversal is found to be an incoherent process with localized nucleation assisted by thermal activation, even though the particle has a single-domain static state. For a larger elongated Fe nanoparticle with a diameter greater than 10 nm, the inhomogeneous magnetic structure of the particle plays important role in the reversal process.

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“…Such MOKE measurements are potentially interesting, as it provides a very sensitive probe that is proportional to the change in the surface magnetisation to a depth of the order of skin-depth of the material [32]. Nevertheless, few articles have been published throughout this work discussing the magnetisation behaviour of Ni 80 Fe 20 [38], Ni 60 Fe 40 [50] and Co [45] nanowires using MOKE magnetometry.…”

Section: Introductionmentioning

confidence: 99%

Surface Morphology and Magnetic Properties of Isolated Cylindrical Nickel Nanowires

Sultan¹

2017

AJN

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Abstract:In this article, the surface morphology and magnetic properties of isolated cylindrical nickel (Ni) nanowires fabricated by electrodeposition have been thoroughly investigated using scanning electron microscopy and Magneto-Optical Kerr Effect (MOKE) magnetometry, respectively. The surfaces of most nanowires were found to be homogenous, uniform, and cylindrical in shape. Some others show different diameters and surface features, including; protrusions and branches along their length. The diameter distribution of a wide range of nanowires was found to differ from their template pore diameters. These all variations are more likely due to defects exist in the internal surfaces of the pores within the template itself, or may be associated with the trapped air pockets within the pores during nanowires growth or due to the oxide formation or residual contaminants which may cover these wires. The nanowires lengths were found to differ from their actual lengths estimated during deposition growth. This was attributed to the breakage of nanowires into small sections during releasing process. The hysteresis loops obtained by applying a magnetic field at different angles with respect to the nanowires long axis showed square hysteresis loops with a sharp jump of Kerr signal during switching behaviour, as well as a high squareness ratio, indicating the dominance of shape anisotropy. These results are quite different from the measurements of high density templated nanowires reported in the literature, due to the small number of nearest neighbour nanowires, and hence no magneto-static interaction. The magnetisation reversal of such wires is well described by the non-uniform rotation of the curling model of domain reversal.

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Study of the magnetization reversal in individual nickel nanowires

Cited by 111 publications

References 25 publications

Electrodeposition of nickel nanowires and nanotubes using various templates

Electrodeposition of nickel nanowires and nanotubes using various templates

Magnetization reversal in elongated Fe nanoparticles

Surface Morphology and Magnetic Properties of Isolated Cylindrical Nickel Nanowires

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