Novel gradient-diameter magnetic nanowire arrays with unconventional magnetic anisotropy behaviors

Wang, Jing; Zuo, Zhengxing; Huang, Liang; Warsi, Muhammad Asif; Xiao, John Q.; Hu, Jun

doi:10.1039/c8cc02294a

Cited by 13 publications

(2 citation statements)

References 28 publications

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“…The obtained hysteresis loops in Figure 6c,d were similar to that reported in other literature. [ 36 ] The coercivity of the shape‐gradient array is higher than that of the uniform‐diameter array for both H ⊥ and H // . The array spacing was much greater than the diameter of a single microwire, so there is mainly dipole interaction among the microwires.…”

Section: Resultsmentioning

confidence: 99%

Direct Writing of Shape‐Gradient Magnetic Alloy Microwire Arrays with Meniscus‐Confined Electrodeposition Process

Nie

Lei

Zhang

et al. 2022

Adv Materials Technologies

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recording due to their high aspect ratio, high coercivity, and high storage density. [6] Modulating the magnitude of the coercivity and the saturation magnetization by combining magnetic materials and pure metals was initially developed in 1978 to produce binary and ternary alloys. [7] Since then, binary alloys have attracted widespread attention due to their potential applications in magnetoresistive and thermoelectric devices. [8] In recent years, the influence of morphology [9] and composition [10] inhomogeneity on magnetic alloy micro/nanowires has been studied extensively. But the preparation of ordered gradient micro/nanowires with controllable diameters and compositions is still a major problem.The gradient magnetic anisotropy is so far mainly achieved by changing the material shape of a single metal micro/ nanowire, [11] or by changing the material composition of alloy micro/nanowires. [12] The anodic aluminum oxide (AAO)-templated electrodeposition method [9] is the most commonly used method for mass production of gradient micro/nanowires. Prida et al. [13] employed a SiO 2 -coated hard AAO membrane as the template for electrochemical growth of multisegmented Co-Ni nanowire arrays by alternately varying between two different deposition potentials. Magnetic anisotropy is realized with the prepared wire arrays due to the alternating composition and crystalline structure of the individual segment. To realize shape gradient, Arzuza et al. [14] combined the three-step anodization with an intermediate chemical etching step to modulate the wire diameter.Gradient magnetic micro/nanowire arrays have attracted widespread attention due to their interesting properties. However, fabricating such an ordered array of gradient micro/nanowires with controllable diameters and compositions is still a great challenge to most of the current methods. Here, meniscus-confined electrodeposition (MCED) technique is adopted for the rapid prototyping of the shape-gradient magnetic Cu/Co-alloy microwire arrays by adjusting the printing speed continuously, which provides a novel idea for the preparation and performance research of shape-gradient magnetic alloy microwire arrays with well-defined structures. It is found that the key to fabricating controllable gradient alloy micro/nano structures by increasing the printing speed is to continuously stretch the meniscus within the stable range of the meniscus. In the range of incremental speed in this study, the shape-gradient magnetic alloy wires with stable and uniform compositions and dense internal structures can be successfully prepared, and the gradient ratio can be adjusted from 0 to about 0.025. Compared with the uniform-diameter array, the shape-gradient magnetic alloy array shows an improvement in remanence and coercive force.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/admt.202200024.

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Section: Resultsmentioning

confidence: 99%

Direct Writing of Shape‐Gradient Magnetic Alloy Microwire Arrays with Meniscus‐Confined Electrodeposition Process

Nie

Lei

Zhang

et al. 2022

Adv Materials Technologies

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“…A high-purity aluminum foil (Alfa Aesar, 99.99%, 0.1 mm) was used to fabricate AAO. The fabrication details are summarized in supplemental materials, which can also be found from refs and .…”

Section: Methodsmentioning

confidence: 99%

Hydrogen Bubble-Directed Tubular Structure: A Novel Mechanism to Facilely Synthesize Nanotube Arrays with Controllable Wall Thickness

Shen

Pan

et al. 2021

ACS Appl. Mater. Interfaces

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Nanowire arrays can be conveniently fabricated by electrodeposition methods using porous anodized alumina oxide templates. They have found applications in numerous fields. Nanotube arrays, with their hollow structure and much enhanced surface-to-volume ratio, as well as an additional tuning parameter in tube wall thickness, promise additional functions compared with nanowire arrays. Using a similar fabrication method, we have developed a facile and general method to fabricate metallic nanotubes (NTs). Using Ni NTs as a model system, the mechanism of the hydrogen-assisted NT growth was postulated and confirmed by controlling the hydrogen formation with conductive salts in an electrodeposition solution, which improves the H2 concentration but prevents the large H2 bubbles from blocking the nanochannel of a template. The controlled hydrogen generation forces the growth along the wall of nanochannels in the templates, leading to the NT formation. The magnetic properties can be controlled by the NT wall thickness, making these NTs useful for various applications.

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Growth and magnetic interaction of single crystalline Ni gradient–diameter magnetic nanowire arrays

Wang

Hong

et al. 2019

J Mater Sci

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Novel gradient-diameter magnetic nanowire arrays with unconventional magnetic anisotropy behaviors

Cited by 13 publications

References 28 publications

Direct Writing of Shape‐Gradient Magnetic Alloy Microwire Arrays with Meniscus‐Confined Electrodeposition Process

Direct Writing of Shape‐Gradient Magnetic Alloy Microwire Arrays with Meniscus‐Confined Electrodeposition Process

Hydrogen Bubble-Directed Tubular Structure: A Novel Mechanism to Facilely Synthesize Nanotube Arrays with Controllable Wall Thickness

Growth and magnetic interaction of single crystalline Ni gradient–diameter magnetic nanowire arrays

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