Fabrication and magnetic properties of metal nanowires via AAO templates

Thongmee, Sirikanjana; Pang, Hanqing; Ding, Jun; Yi, Jiabao; Lin, Jianyi

doi:10.1109/inec.2008.4585678

Cited by 4 publications

(5 citation statements)

References 17 publications

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“…The total length of the NWs, h, has been determined from the cross section view of the sample using optical microscopy as shown in figure 5 the 100 nm diameter array with h = 28 μm means that r 1 < , which explains why the main FMR absorption is located at high resonance fields corresponding to the poly-crystalline stage absorption (see figure 1 (a)). Our results are then consistent with previous studies that already reported a twostage growth mechanism in Ni NWs that can be controlled via the length of the NWs [31,32]. As a consequence, h is a key parameter that allows to induce appreciable changes in the line-shape of the FMR absorption spectra for arrays of Ni NWs for whatever its diameter.…”

Section: Discussionsupporting

confidence: 92%

“…These changes are related to a complex growth mechanism of the NWs for which the crystalline structure along its axis changes during the growth. As reported in the case of Sb and Co [30], as well as Ni NWs [31,32], an initial 3D nucleation mechanism is followed by a 2D epitaxial growth, leading to a change in the NWs structure from poly-crystalline to single-crystalline. Moreover, several reports have shown that these features depend on the diameter of the NWs [26][27][28].…”

Section: Resultsmentioning

confidence: 61%

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Large magnetic anisotropy enhancement in size controlled Ni nanowires electrodeposited into nanoporous alumina templates

et al. 2016

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A large enhancement of the magnetic anisotropy of Ni nanowires (NWs) embedded in anodic aluminium oxide porous membranes is obtained as a result of an induced magnetoelastic (ME) anisotropy contribution. This unusual large anisotropy enhancement depends on the diameter of the NWs and exceeds the magnetostatic (MS) contribution. As a consequence, it leads to effective magnetic anisotropy energies as large as 1.4 × 10(6) erg cm(-3), which are of the same order of magnitude and comparable to the MS energies of harder magnetic materials like Co NWs. Specifically, from ferromagnetic resonance experiments, the magnetic anisotropy of the NWs has been observed to increase as its diameter is decreased, leading to values that are about four times larger than the corresponding value when only the MS anisotropy is present. Our results are consistent with the recently proposed growth mechanism of Ni NWs that proceeds via a poly-crystalline stage at the bottom followed by a single-crystalline stage with texture [110] parallel to the axis of the NWs. A strong correlation between reducing the diameter of the NWs with the decrease of the length of the poly-crystalline segment and the enhancement of the effective magnetic anisotropy has been shown. Magnetization curves obtained from alternating gradient magnetometry experiments show that the average ME anisotropy results from the competition between the magnetic anisotropies of both crystalline segments of the NWs. Understanding the influence of size and confinement effects on the magnetic properties of nanocomposites is of prime interest for the development of novel and agile devices.

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Section: Discussionsupporting

confidence: 92%

Section: Resultsmentioning

confidence: 61%

Large magnetic anisotropy enhancement in size controlled Ni nanowires electrodeposited into nanoporous alumina templates

et al. 2016

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“…Electrodeposition has been most commonly employed, because of its simplicity and resulting dense NWs in high yield. Cu, Fe (Thongmee et al, 2008 ), Ni (Byrne et al, 2009 ), Co (Vivas et al, 2012a ; Proenca et al, 2013 ), and CoNi (Vivas et al, 2012b ) NWs have been prepared by electrodeposition, and their biocompatibilities and magnetic properties were investigated. All NWs except for Fe were single crystalline, without post-treatment after electrodeposition.…”

Section: Aao Templatesmentioning

confidence: 99%

Hard template synthesis of metal nanowires

2014

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Metal nanowires (NWs) have attracted much attention because of their high electron conductivity, optical transmittance, and tunable magnetic properties. Metal NWs have been synthesized using soft templates such as surface stabilizing molecules and polymers, and hard templates such as anodic aluminum oxide, mesoporous oxide, carbon nanotubes. NWs prepared from hard templates are composites of metals and the oxide/carbon matrix. Thus, selecting appropriate elements can simplify the production of composite devices. The resulting NWs are immobilized and spatially arranged, as dictated by the ordered porous structure of the template. This avoids the NWs from aggregating, which is common for NWs prepared with soft templates in solution. Herein, the hard template synthesis of metal NWs is reviewed, and the resulting structures, properties and potential applications are discussed.

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“…The beneficial properties of the Cu/Ni modified AAO layers can be further extended by addition of other elements, such as Fe and Co [46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Anodized Al 1050 with Electrochemically Deposited Cu, Ni and Cu/Ni and Their Behavior in a Model Corrosive Medium

Girginov

Kozhukharov

Tsanev

et al. 2021

J. Electrochem. Sci. Technol

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The specific benefits of the modified films formed on preliminary anodized aluminum, including the versatility of their potential applications impose the need for evaluation of the exploitation reliability of these films. In this aspect, the durability of Cu and Ni modified anodized aluminum oxide (AAO) films on the low-doped AA1050 alloy was assessed through extended exposure to a 3.5% NaCl model corrosive medium. The electrochemical measurements by means of electrochemical impedance spectroscopy (EIS) and potentiodynamic scanning (PDS) after 24 and 720 hours of exposure have revealed that the obtained films do not change their obvious barrier properties. In addition, supplemental analyses of the coatings were performed, in order to elucidate the impact of the AC-deposition of Cu and Ni inside the pores. The scanning electron microscopy (SEM) images have shown that the surface topology is not affected and resembles the typical surface of an etched metal. The subsequent energy dispersive X-ray spectroscopy (EDX) tests have revealed a predominance of Cu in the combined AAO-Cu/Ni layers, whereas additional X-ray photoelectron (XPS) analyses showed that both metals form oxides with different oxidation states due to alterations in the deposition conditions, promoted by the application of AC-polarization of the samples.

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Fabrication and magnetic properties of metal nanowires via AAO templates

Cited by 4 publications

References 17 publications

Large magnetic anisotropy enhancement in size controlled Ni nanowires electrodeposited into nanoporous alumina templates

Large magnetic anisotropy enhancement in size controlled Ni nanowires electrodeposited into nanoporous alumina templates

Hard template synthesis of metal nanowires

Characterization of Anodized Al 1050 with Electrochemically Deposited Cu, Ni and Cu/Ni and Their Behavior in a Model Corrosive Medium

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