Structure and magnetic properties of CoNiP nanowire arrays embedded in AAO template

He, Xiaoli; Yue, Guangbing; Hao, Yong; Xu, Qiaoling; Wei, Qing; Zhu, Xiaoguang; Kong, Mingguang; Zhang, Lide; Li, Xing

doi:10.1016/j.jcrysgro.2008.04.023

Cited by 10 publications

(5 citation statements)

References 29 publications

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“…There have been numerous reports on electrodeposited Co, Ni, and Fe nanowires and their alloys with large crystalline anisotropies [6,11,12,13,14,15]. Among them, CoNiP nanowires are of particular interest due to its larger H c and higher M s compared to their single metals [16]. Rani et al reported that the CoNiP nanowires possessed H c as large as 500 Oe, and the crystal structure of the wire was a mixture of fcc and hcp [17].…”

Section: Introductionmentioning

confidence: 99%

“…From both the basic and applied research perspectives, a clear understanding of the effects of synthesis parameters (e.g., deposition current and time, pH solution) [22,23,24,25,26,27] and morphology (e.g., wire length and diameter) [6,9,28,29] on the magnetic properties of ordered nanowire arrays is essential. Despite some previous efforts [16,17], effects of the wire diameter on the magnetic properties of the ordered CoNiP nanowire arrays remained to be investigated.…”

Section: Introductionmentioning

confidence: 99%

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Magnetization Reversal and Magnetic Anisotropy in Ordered CoNiP Nanowire Arrays: Effects of Wire Diameter

Thiem

Phan

2015

Sensors

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Ordered CoNiP nanowires with the same length of 4 µm and varying diameters (d = 100 nm–600 nm) were fabricated by electrodeposition of CoNiP onto polycarbonate templates. X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy confirmed the quality of the fabricated nanowires. Magnetic measurements and theoretical analysis revealed that the magnetization reversal and magnetic anisotropy were significantly influenced by varying of the diameters of the nanowires. There existed a critical wire diameter (dc ≈ 276 nm), below which the magnetization reversal occurred via a coherent rotation mode, and above which the magnetization reversal occurred via a curling rotation mode. The easy axis of the magnetization tended to change in direction from parallel to perpendicular with respect to the wire axis as the wire diameter exceeded dc ≈ 276 nm. With increasing wire diameter, the coercive field (Hc) and the remanent to saturation magnetization ratio (Mr/Ms) were also found to rapidly decrease in the range d = 100–400 nm and gradually decrease for d > 400 nm.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetization Reversal and Magnetic Anisotropy in Ordered CoNiP Nanowire Arrays: Effects of Wire Diameter

Thiem

Phan

2015

Sensors

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“…Due to the handling problems associated with the free-standing template, this type of AAO generally has a thickness of more than 10 μm. As a result, nanowires fabricated in this fashion usually have a length of several tens of microns and a very high aspect ratio [19].…”

Section: Introductionmentioning

confidence: 99%

Barrier layer non-uniformity effects in anodized aluminum oxide nanopores on ITO substrates

Liu

Singh²,

Rajaputra

2010

Nanotechnology

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Nanoporous anodic aluminum oxide (AAO) has been used widely as a template for device fabrication. In many nanostructured electro-optical device designs, AAO grown on an ITO substrate is the desired configuration. However, a residual thin aluminum oxide barrier layer between ITO and the AAO pores remains and process non-uniformities during the template fabrication can cause serious problems in the quality of nanowires deposited later in these pores. It was observed that in many templates, even the pores closest to each other could have their barrier layer thicknesses differ by as much as 10-20 nm. In this paper, causes and remedies for this non-uniformity are investigated, including the effects of a thin Ti interlayer inserted between the ITO and AAO. Templates with different Ti layer thickness and annealing conditions were compared. Mechanisms for the formation of voids beneath the barrier layer were analyzed and studied experimentally. Reactive ion etch (RIE) was found to be the preferred method to mitigate process non-uniformities. Using the above methods, barrier-free AAO templates on ITO substrates were obtained; their thicknesses ranged from 200 to 1000 nm. The characteristics of CdS nanowires electrodeposited into the initial templates with non-uniform barrier layer thicknesses and into the processed, barrier-free templates were compared.

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“…Actually, during the process of electrodeposition, by adjusting deposition conditions such as the pH value [2], pulse electrodeposition [16][17][18], deposition potential [19] and deposition current density [20], the microstructure of Co nanowire was adjusted accordingly. Recently, He et al indicated that by controlling the electrolyte temperature, magnetic properties of CoNiP nanowire arrays can be adjusted easily [21].…”

Section: Introductionmentioning

confidence: 99%

Influence of crystal orientation on magnetic properties of hcp Co nanowire arrays

Han¹,

Liu²,

Wang³

et al. 2009

J. Phys. D: Appl. Phys.

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In this paper we develop a convenient way to control the direction of uniaxial magnetocrystalline easy axis in ac electrodeposited hcp Co nanowire arrays. The c-axis of hcp cobalt can be oriented parallel or perpendicular to the long axis of the wire by adjusting the temperature of the electrolyte. Magnetic characterizations suggest that the direction of the hcp c-axis plays an important role in the magnetization reversal process. A three-dimensional object oriented micromagnetic framework code was used to confirm the conclusion. It can be seen that the crystal orientation influences the magnetization and demagnetization process observably when the magnetocrystalline anisotropy energy is comparable to the shape anisotropy energy.

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Structure and magnetic properties of CoNiP nanowire arrays embedded in AAO template

Cited by 10 publications

References 29 publications

Magnetization Reversal and Magnetic Anisotropy in Ordered CoNiP Nanowire Arrays: Effects of Wire Diameter

Magnetization Reversal and Magnetic Anisotropy in Ordered CoNiP Nanowire Arrays: Effects of Wire Diameter

Barrier layer non-uniformity effects in anodized aluminum oxide nanopores on ITO substrates

Influence of crystal orientation on magnetic properties of hcp Co nanowire arrays

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