Control of magnetic anisotropy of Co nanowires

Cho, Ji Ung; Wu, Jun; Min, Ji Hyun; Ko, Seung Pil; Soh, Joon Young; Liu, Qun Xian; Kim, Young Keun

doi:10.1016/j.jmmm.2006.01.082

Cited by 79 publications

(39 citation statements)

References 12 publications

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“…Magnetic studies involving template synthesized ferromagnetic nanowire arrays are mainly focused on lowdensity arrays, even single ferromagnetic nanowire arrays of transition metals [6]. As for high density arrays, usually the magnetic behavior of very large aspect ratio wires is comparatively investigated between different metals [7,8] and crystal structures [9,10]. Therefore, more studies involving densely packed arrays are needed to understand the effect of aspect ratio, packing density on array magnetic properties, and to improve their potential in data storage applications.…”

Section: Introductionmentioning

confidence: 99%

Diameter‐Controllable Magnetic Properties of Co Nanowire Arrays by Pulsed Electrodeposition

Yang

Chen

et al. 2010

Journal of Nanomaterials

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The Co nanowires with different diameters were prepared by pulsed electrodeposition into anodic alumina membranes oxide templates. The micrographs and crystal structures of nanowires were studied by FE-SEM, TEM, and XRD. Due to their cylindrical shape, the nanowires exhibit perpendicular anisotropy. The coercivity and loop squareness (Mr/Ms) of Co nanowires depend strongly on the diameter. Both coercivity and Mr/Ms decrease with increasing wire diameter. The behavior of the nanowires is explained briefly in terms of localized magnetization reversal.

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Section: Introductionmentioning

confidence: 99%

Diameter‐Controllable Magnetic Properties of Co Nanowire Arrays by Pulsed Electrodeposition

Yang

Chen

et al. 2010

Journal of Nanomaterials

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“…It is known that amorphization in electrodeposited Co-W films typically takes place for higher W contents ( 30 at.%) [33]. Also it is known that the face-centered cubic (fcc) phase of Co is promoted during electrodeposition of nanowires only for rather acid pH values, close to pH 2 [12,47], which is not the case of our study. Finally, according to the Co-W binary phase diagram, W is also stabilizer of the hcp phase when dissolved in small amounts into Co [48].…”

Section: Pulse Current (Pc) Depositionmentioning

confidence: 59%

“…This can be ascribed to the trade-off between the effective shape anisotropy of the mesowires and the net role of interwire dipolar interactions. It is remarkable that the measured values of H C in the Co-W mesowires are larger than those of pure fcc-Co or hcp-Co for wires with similar diameter and aspect ratio and interwire distance, where H C typically ranges between 100 and 250 Oe [27,47,49,50].…”

Section: Magnetic Propertiesmentioning

confidence: 91%

Toward uniform electrodeposition of magnetic Co-W mesowires arrays: direct versus pulse current deposition

Цынцару

Силкин

Cesiulis

et al. 2016

Electrochimica Acta

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Template-assisted electrodeposition of Co-rich Co-W alloys into mesoporous anodized aluminum oxide from ammonia-free solutions is investigated. The optimum deposition conditions rendering uniform filling of the pores, either by direct current (DC) or pulse current (PC) methods, are established. Contrary to the DC deposition on flat surfaces (which is kinetically controlled), the DC electrodeposition in the mesopores of the template is limited by mass transfer. Conversely, under PC mode, the Co-W electrodeposition process is controlled by kinetics at frequencies > 0.3 Hz; and by diffusion at lower frequencies. The obtained mesowires are nanocrystalline and exhibit a hexagonal closed packed (hcp) structure. The magnetic properties of selected Co-W mesowires, with variable aspect ratio, are also studied. The arrays of mesowires exhibit a semi-hard ferromagnetic behavior with coercivity values that surpass those of Co mesowires with similar dimensions. The interplay between interwire dipolar interactions, magnetocrystalline anisotropy and shape anisotropy on the overall shape of the hysteresis loops (in particular, on the coercivity and squareness ratio values, as well as on the effective magnetic easy axis direction) is investigated in a semiquantitative manner.

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“…Moreover, for the hcp and fcc Co nanowires, magnetic measurements can provide a conclusive evidence on the easy axis as a result of different magnetocrystalline and shape anisotropies. For hcp-phase Co, magnetocrystalline anisotropy energy density is comparable to the shape anisotropy energy density (5×10 6 against 6 × 10 6 erg/cm 3 , respectively) [39]. Therefore, the effective magnetic anisotropy should be determined by considering both magnetocrystalline anisotropy and shape anisotropy contributions.…”

Section: Resultsmentioning

confidence: 99%

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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Control of magnetic anisotropy of Co nanowires

Cited by 79 publications

References 12 publications

Diameter‐Controllable Magnetic Properties of Co Nanowire Arrays by Pulsed Electrodeposition

Diameter‐Controllable Magnetic Properties of Co Nanowire Arrays by Pulsed Electrodeposition

Toward uniform electrodeposition of magnetic Co-W mesowires arrays: direct versus pulse current deposition

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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