Journal ArticleDOI
Controlled changes in the microstructure and magnetic anisotropy in arrays of electrodeposited Co nanowires induced by the solution pH
TLDR
In this article, the effects of the electrolytic bath acidity, or pH, on the magnetic properties in arrays of electrodeposited Co nanowires and their correlation with the crystalline properties have been studied using ferromagnetic resonance.Abstract:
The effects of the electrolytic bath acidity, or pH, on the magnetic properties in arrays of electrodeposited Co nanowires and their correlation with the crystalline properties have been studied using ferromagnetic resonance. The results show that, depending on the value of the pH of the electrolyte, appreciable changes in the effective anisotropy can be induced. These changes are attributed to modifications in the microstructure of the Co nanowires. In particular, quantification of the effective anisotropy field shows that the microstructure of the deposited Co wires can be set to contain a dominant fraction of the Co-hcp phase with the c-axis oriented perpendicular to the wires, for pH values of 3.8-4.0, or parallel to the wires, for pH values >or=6.0. This results in a competitive or additive magnetocrystalline contribution to the total anisotropy field. Furthermore, at a pH value of 2.0, no contribution from the magnetocrystalline anisotropy is present, indicating a lack of texture in the Co microstructure. As a result, the effective anisotropy can be controlled over a field range of 5 kOe.read more
Citations
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Journal ArticleDOI
Growth of single-crystalline Ni and Co nanowires via electrochemical deposition and their magnetic properties.
Hui Pan,B. H. Liu,Jiabao Yi,Chee Kok Poh,San Hua Lim,Jun Ding,Yuan Ping Feng,Cheng Hon Alfred Huan,Jianyi Lin +8 more
TL;DR: Structural characterization shows that the single-crystalline Ni nanowire has a preferred orientation along the [220] direction, and the effects of electrochemical deposition conditions on the structure of Ni Nanowires are systematically studied to investigate the growth mechanism.
Journal ArticleDOI
Nanoporous alumina as templates for multifunctional applications
TL;DR: In this article, the ground work on the fabrication methods of porous anodic alumina (PAA) membranes and PAA-based nanostructures is described, and the specificities of the electrochemical growth processes of multifunctional nanomaterials with diversified shapes (e.g., nanowires and nanotubes), and the fabrication techniques used to grow ordered nanohole arrays.
Journal ArticleDOI
Anisotropic optical properties of arrays of gold nanorods embedded in alumina
Ron Atkinson,William Hendren,Gregory A. Wurtz,Wayne Dickson,Anatoly V. Zayats,Paul R. Evans,Robert Pollard +6 more
TL;DR: In this article, a series of thin films comprising gold nanorods embedded in an alumina matrix have been fabricated with lengths ranging from 75 to 330 µm and their optical properties, expressed in terms of extinction, were measured as a function of wavelength, rod length, angle of incidence, and incident polarization state.
Journal ArticleDOI
Electrochemical control and selection of the structural and magnetic properties of cobalt nanowires
Michaël Darques,Luc Piraux,Armando Encinas,Pascale Bayle-Guillemaud,Adriana Florina Popa,Ursula Ebels +5 more
TL;DR: In this paper, the direction of the uniaxial magnetocrystalline anisotropy in arrays of electrodeposited hcp Co nanowires is controlled by changing the deposition current density or deposition rate.
Journal ArticleDOI
Magnetic properties of Co nanopillar arrays prepared from alumina templates.
L. G. Vivas,Yu. P. Ivanov,Yu. P. Ivanov,Daniel G. Trabada,M P Proenca,M P Proenca,Oksana Chubykalo-Fesenko,Manuel Vázquez +7 more
TL;DR: The preparation of magnetic nanopillars from anodic alumina templates represents a cheap way to obtain extensive ordered arrays, and thus is very appealing for nanotechnology applications.
References
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Book
Introduction to solid state physics
TL;DR: In this paper, the Hartree-Fock Approximation of many-body techniques and the Electron Gas Polarons and Electron-phonon Interaction are discussed.
Journal ArticleDOI
Hexagonally ordered 100 nm period nickel nanowire arrays
Kornelius Nielsch,Ralf B. Wehrspohn,J. Barthel,Jürgen Kirschner,Ulrich Gösele,Saskia F. Fischer,Helmut Kronmüller +6 more
TL;DR: The magnetic behavior of 100 nm period arrays of Ni nanowires embedded in a highly ordered alumina pore matrix was characterized by magnetometry and magnetic force microscopy as discussed by the authors.
Journal ArticleDOI
Dipolar interactions in arrays of nickel nanowires studied by ferromagnetic resonance
TL;DR: In this article, the dipolar interactions between the wires can be modeled in a mean-field approach as an effective uniaxial anisotropy field oriented perpendicular to the wire axis and proportional to the membrane porosity.
Journal ArticleDOI
Low-temperature study of the magnetization reversal and magnetic anisotropy of Fe, Ni, and Co nanowires
TL;DR: In this article, an extensive study of the magnetic reversal mechanism of Fe and Ni nanowires with diameters down to 6 nm is presented, i.e. smaller than the domain wall width, and the activation energy associated with the reversal process is proportional to the cross-section of the wires and nearly independent of the wire length.
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