Temperature dependence of the effective anisotropy in Ni nanowire arrays

Meneses, Fernando; Urreta, S.E.; Escrig, Juan; Bercoff, Paula G.

doi:10.1016/j.cap.2018.06.014

Cited by 17 publications

(7 citation statements)

References 45 publications

(73 reference statements)

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“…Electrospinning (Li et al, 2003;Graeser et al, 2007;Wu et al, 2007) and electrodeposition using an aluminum oxide or other template (Salem et al, 2012;Zhang et al, 2013;Meneses et al, 2018;Frolov et al, 2019) are two common methods to make ferromagnetic metallic nanofibers of materials that include Ni (Wu et al, 2007;Meneses et al, 2018), Fe (Graeser et al, 2007;Wu et al, 2007), Co (Graeser et al, 2007;Wu et al, 2007), and Ni 1-x Fe x (Salem et al, 2012;Zhang et al, 2013;Frolov et al, 2019). Electrospinning has the advantage, that it is, a relatively simpler preparation method and it is possible to fabricate larger nanofibre mats.…”

Section: Introductionmentioning

confidence: 99%

Electrospun, Oriented, Ferromagnetic Ni1-xFex Nanofibers

et al. 2020

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Electrospinning has been used to fabricate ferromagnetic Ni 0. 47Fe 0.53 nanofiber mats that were composed of individual, orientated Ni 0.47 Fe 0.53 nanofibers. The key steps were processing a polyvinylpyrrolidone nanofiber template containing ferric nitrate and nickel acetate metal precursors in Ar at 300 • C and then 95% Ar: 5% H 2 at 600 • C. The Ni 0.47 Fe 0.53 fibers were nanostructured and contained Ni 0.47 Fe 0.53 nanocrystals with average diameters of ∼14 nm. The Ni 0.47 Fe 0.53 ferromagnetic mats had a high saturation magnetic moment per formula unit that was comparable to those reported in other studies of nanostructured Ni 1-x Fe x. There is a small spin-disordered fraction that is typically seen in nanoscale ferromagnets and is likely to be caused by the surface of the nanofibers. There was an additional magnetic contribution that could possibly stem from a small Fe 1-z Ni z O phase fraction surrounding the fibers. The coercivity was found to be enhanced when compared with the bulk material.

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Section: Introductionmentioning

confidence: 99%

Electrospun, Oriented, Ferromagnetic Ni1-xFex Nanofibers

et al. 2020

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“…Another reason is the experimental techniques used for the samples study—with or without the MPAA and/or with or without an aluminum substrate. In this case, with fluctuations in the external temperature, the weakening of the magnetic anisotropy and the change in the parameters of NWs with a rise in their length are associated with the appearance of magnetoelastic anisotropy, caused by the difference in thermoelastic characteristics of the Ni/MPAA composite material and the deterioration of the quality of the NWs with an increase in their length [ 78 , 79 , 80 , 81 ]. However, our NWs samples had smooth walls and a thin conducting Ti deposited on the backside of the MPAA.…”

Section: Resultsmentioning

confidence: 99%

Magnetic Properties of the Densely Packed Ultra-Long Ni Nanowires Encapsulated in Alumina Membrane

et al. 2021

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High-quality and compact arrays of Ni nanowires with a high ratio (up to 700) were obtained by DC electrochemical deposition into porous anodic alumina membranes with a distance between pores equal to 105 nm. The nanowire arrays were examined using scanning electron microscopy, X-ray diffraction analysis and vibration magnetometry at 300 K and 4.2 K. Microscopic and X-ray diffraction results showed that Ni nanowires are homogeneous, with smooth walls and mostly single-crystalline materials with a 220-oriented growth direction. The magnetic properties of the samples (coercivity and squareness) depend more on the length of the nanowires and the packing factor (the volume fraction of the nanowires in the membrane). It is shown that the dipolar interaction changes the demagnetizing field during a reversal magnetization of the Ni nanowires, and the general effective field of magnetostatic uniaxial shape anisotropy. The effect of magnetostatic interaction between ultra-long nanowires (with an aspect ratio of >500) in samples with a packing factor of ≥37% leads to a reversal magnetization state, in which a “curling”-type model of nanowire behavior is realized.

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“…Moreover, there is no good correlation between the height of the Npillars and ⊥ H c [ 35 ]. Nevertheless, these Npillars are polycrystalline and do not show an extraordinary preferential magnetic orientation [ 36 ].…”

Section: Resultsmentioning

confidence: 99%

“…For instance, if the potentiostatic samples grow with more elongated grains in the perpendicular direction, the ⊥ H c is expected to increase due to more overlapping grains or increased heights [ 22 ]. Additionally, the easy axis orientation perpendicular to the applied field for the 1 C sample could be explained with ellipsoid-like grains, which exhibit anisotropy in their long axis [ 33 , 36 , 37 ]. In contrast, the galvanostatic samples with 1 C and 2 C are more isotropic, while the sample with 3 C presents the highest Npillars, thus implying the greatest anisotropy.…”

Section: Resultsmentioning

confidence: 99%

Nickel Nanopillar Arrays Electrodeposited on Silicon Substrates Using Porous Alumina Templates

et al. 2020

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Nickel nanopillar arrays were electrodeposited onto silicon substrates using porous alumina membranes as a template. The characterization of the samples was done by scanning electron microscopy, X-ray diffraction, and alternating force gradient magnetometry. Ni nanostructures were directly grown on Si by galvanostatic and potentiostatic electrodeposition techniques in three remarkable charge transfer configurations. Differences in the growth mechanisms of the nanopillars were observed, depending on the deposition method. A high correlation between the height of the nanopillars and the charge synthesis was observed irrespective of the electrochemical technique. The magnetization measurements demonstrated a main dependence with the height of the nanopillars. The synthesis of Ni nanosystems with a controllable aspect ratio provides an effective way to produce well-ordered networks for wide scientific applications.

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Temperature dependence of the effective anisotropy in Ni nanowire arrays

Cited by 17 publications

References 45 publications

Electrospun, Oriented, Ferromagnetic Ni1-xFex Nanofibers

Electrospun, Oriented, Ferromagnetic Ni1-xFex Nanofibers

Magnetic Properties of the Densely Packed Ultra-Long Ni Nanowires Encapsulated in Alumina Membrane

Nickel Nanopillar Arrays Electrodeposited on Silicon Substrates Using Porous Alumina Templates

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