Influence of aspect ratio and anisotropy distribution in ordered CoNi nanowire arrays

Rosa, W.O.; Vivas, L. G.; Pirota, K. R.; Asenjo, A.; Vázquez, M.

doi:10.1016/j.jmmm.2012.05.047

Cited by 47 publications

(23 citation statements)

References 26 publications

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“…High aspect-ratio magnetic nanomaterials, especially magnetic nanowire arrays have generated growing interest in the scientific community due to their potential applications in magnetic sensors, high-density magnetic recording, bioengineering, and magneto-electronic devices [1,2,3,4,5,6,7,8,9,10]. The magnetic nanowires possess unique properties that are quite different from those of their thin film, nanoparticle, and nanotube counterparts [6,9].…”

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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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%

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

Thiem

Phan

2015

Sensors

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“…Our results are consisted with recently reported results for the magnetic anisotropy of Co-based nanorods which resulted from the shape anisotropy dominated over the magnetocrystalline. 13) Moreover, the M-H loops became square as H A increased which is a strong evidence for influence of applied magnetic field during deposited on the magnetic properties of Co-Ni-P nanorods. The effects of H A to the magnetic properties of Co-Ni-P nanorod were shown in Fig.…”

Section: Resultsmentioning

confidence: 74%

Magnetic Behaviors of Arrays of Co-Ni-P Nanorod: Effects of Applied Magnetic Field

Thiem¹,

Pham²,

Dũng

et al. 2015

Mater. Trans.

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The Co-Ni-P nanorods were fabricated by electrodeposition method by using the porous polycarbonate template. The investigation by mean of X-ray diffraction and high-resolution transmission electron microscopy indicated that samples were nanocrystalline clusters embedded in the amorphous base. The samples exhibited a room temperature ferromagnetism with the high magnetic anisotropy along the rod. The applied magnetic fields during the fabrication of the Co-Ni-P nanorods was strongly influenced by the magnetic properties. The M R /M S ratio and coercivity rapidly increased when the magnetic applied field changed from 0 to 0.21 T.

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“…It has also been reported [35,36] that because of the strong shape anisotropy, nanowire arrays exhibit uniaxial magnetic anisotropy with respect to the easy magnetization direction along the nanowire axes. So, a very different magnetization of nanowires along in-plane in comparison with that along out-of-plane in the present work probably is due to the predominant shape anisotropy contribution.…”

Section: Resultsmentioning

confidence: 86%

Influence of Composition, pH, Annealing Temperature, Wave Form, and Frequency on Structure and Magnetic Properties of Binary Co1−x Al x and Ternary (Co0.97Al0.03)1−x Fe x Nanowire Alloys

Najafi

2016

J Supercond Nov Magn

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Co 1−x Al x and (Co 0.97 Al 0.03 ) 1−x Fe x nanowire alloys and elemental Co nanowire were prepared in anodic aluminum oxide templates by the electrochemical deposition method. The influence of composition, pH, annealing temperature, wave form, and frequency on structure and magnetic properties of Co/Al/Fe nanowires was studied. The changes in the saturation magnetization, coercivity, remanent squareness, and crystal structure of nanowires with changing of the above parameters were also investigated. The roomtemperature magnetic hysteresis loops show that the coercivity and squareness of the nanowire arrays in parallel to the wire axis change with the changing of the abovementioned parameters, which can be mainly attributed to the strengthening of anisotropy. X-ray diffraction observations demonstrated that the isolated nanowires have a crystalline structure and that their phases change with the annealing temperature. Magnetic measurements, on the other hand, showed that the coercivity reached a maximum value at x = 0.03 in the Co 1−x Al x nanowires. Also, the coercivity of the Co 1−x Al x nanowires was increased with increasing annealing temperature for all the compositions.

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Influence of aspect ratio and anisotropy distribution in ordered CoNi nanowire arrays

Cited by 47 publications

References 26 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

Magnetic Behaviors of Arrays of Co-Ni-P Nanorod: Effects of Applied Magnetic Field

Influence of Composition, pH, Annealing Temperature, Wave Form, and Frequency on Structure and Magnetic Properties of Binary Co1−x Al x and Ternary (Co0.97Al0.03)1−x Fe x Nanowire Alloys

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