Magnetic anisotropy in arrays of Ni, CoFeB, and Ni/Cu nanowires

Carignan, Louis‐Philippe; Lacroix, Christian; Ouimet, Alexandre; Ciureanu, M.; Yelon, A.; Ménard, David

doi:10.1063/1.2756522

Cited by 98 publications

(55 citation statements)

References 17 publications

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“…17). Good agreement (Béron et al, 2008b) was found between the experimental ΔH u values of uniform nanowires (Figs 13-14a) and the predicted values of interaction field at saturation from a micromagnetic model and from an effective field model (Carignan et al, 2007). …”

Section: Axial Applied Fieldsupporting

confidence: 55%

“…The non-magnetic metal is kept dilute in the solution to avoid excessive inclusion in the magnetic layer. Ni/Cu nanowires were fabricated by this method (-1 V for Ni, -0.56 V for Cu), varying the Cu/Ni ratio from 0.3 to 1.17 (Carignan et al, 2007). …”

Section: Fabrication Of Nanowire Arraysmentioning

confidence: 99%

“…Moreover, with a multilayer structure (i.e. alternation of magnetic and nonmagnetic nanodiscs), controlling the ratio between the magnetic and non-magnetic nanodiscs provides easy control of the effective anisotropy of the array (Tang et al, 2007;Carignan et al, 2007). This possibility makes the multilayer nanowire array particularly interesting for high frequency devices (Ye et al, 2007), especially circulators (Saib et al, 2001), although the initial goal of using multilayer nanowires was to obtain giant magnetoresistance devices (Blondel et al, 1994, Piraux et al, 1994Piraux et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…: distribution of higher coercivity, circled on figure 16a). Finally, for arrays of radius significantly larger than the nanowire length and for which the condition L/2D >> 1 is satisfied, then the interaction field decreases near the nanowire extremities (Carignan et al, 2007). Therefore, depending upon the applied field direction (positive or negative), the magnetisation reversal is favoured either by a maximal or minimal value of interaction field, inducing a non-linearity in the FORC distribution (Fig.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Extracting Individual Properties from Global Behaviour: First-order Reversal Curve Method Applied to Magnetic Nanowire Arrays

Béron¹,

Carignan²,

Ménard³

et al. 2010

Electrodeposited Nanowires and Their Applications

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Section: Axial Applied Fieldsupporting

confidence: 55%

Section: Fabrication Of Nanowire Arraysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Extracting Individual Properties from Global Behaviour: First-order Reversal Curve Method Applied to Magnetic Nanowire Arrays

Béron¹,

Carignan²,

Ménard³

et al. 2010

Electrodeposited Nanowires and Their Applications

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“…The existence of this easy-plane shape anisotropy was demonstrated through the use of a simple macrospin theoretical model in Ref. 46. The presence of the easy-plane shape anisotropy in MNWAs was also described in Refs.…”

Section: Introductionmentioning

confidence: 99%

Static and dynamic magnetic properties of densely packed magnetic nanowire arrays

et al. 2013

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The static and dynamic magnetic properties of magnetic nanowire arrays with high packing density (>0.4) and wire diameter much greater than the exchange length have been studied by static and time-resolved magneto-optical Kerr effect measurements and micromagnetic simulations. The nanowires were formed by electrodeposition within a nanoporous template such that their symmetry axes lay normal to the plane of the substrate. A quantitative and systematic investigation has been made of the static and dynamic properties of the array, which lie between the limiting cases of a single wire and a continuous ferromagnetic thin film. In particular, the competition between anisotropies associated with the shape of the individual nanowires and that of the array as a whole has been studied. Measured and simulated hysteresis loops are largely anhysteretic with zero remanence, and the micromagnetic configuration is such that the net magnetization vanishes in directions orthogonal to the applied field. Simulations of the remanent state reveal antiferromagnetic alignment of the magnetization in adjacent nanowires and the formation of vortex flux closure structures at the ends of each nanowire. The excitation spectra obtained from experiment and micromagnetic simulations are in qualitative agreement for magnetic fields applied both parallel and perpendicular to the axes of the nanowires. For the field parallel to the nanowire axes, there is also good quantitative agreement between experiment and simulation. The resonant frequencies are initially found to decrease as the applied field is increased from remanence. This is the result of a change of mode profile within the plane of the array from nonuniform to uniform as the ground state evolves with increasing applied field. Quantitative differences between experimental and simulated spectra are observed when the field is applied perpendicular to the nanowire axes. The dependence of the magnetic excitation spectra upon the array packing density is explored, and dispersion curves for spin waves propagating within the array parallel to the nanowire axis are presented. Finally, a tunneling of end modes through the middle region of the nanowires was observed. The tunneling is more efficient for wires forming densely packed arrays, as a result of the extended penetration of the dynamic demagnetizing fields into the middle of the wires and due to the lowering of the tunneling barrier by the static demagnetizing field of the array.

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Multifunctional Touch Sensing and Antibacterial Polymer‐Based Core‐Shell Metallic Nanowire Composites for High Traffic Surfaces

Polícia

Peřinka

Alesanco

et al. 2022

Adv Materials Technologies

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also related to the recent COVID-19 outbreak. This pandemic scenario poses significant threats to public health [1] and there is an urgent need to find robust methods to control the spread of disease in public places or hospital settings. This is important for both viruses and bacteria since COVID-19 patients have an increased risk of cross-contamination, [2] which may increase the risk of developing severe disease and thus induce a higher mortality rate.It is consensual that the spread of viruses and bacteria are mostly related to exposure to respiratory droplets. [3] Nevertheless, the infection through contact with contaminated surfaces or objects (fomites) is an increasing reality and it is still not clear the proportion of this type of transmission for a variety of bacterial infections. In fact, it has been also reported cases of COVID-19 infection potentially attributed to fomite transmission, [4] transmitted between people by touching surfaces on which an ill person has recently coughed or sneezed on. [5] Indeed, high traffic surfaces in public spaces such asThe transmission of bacterial infections through contaminated surfaces is nowadays an increasing source of concern, also related to the current pandemic situation. Functional materials that prevent the adhesion of microorganisms and/ or induce their eradication thus avoiding fomite transmission are highly needed. In this work, a highly antimicrobial hybrid with sensorial capability is developed to be further applied as interactive high traffic surface coatings. The nanocomposite is composed of polyvinylidene fluoride (PVDF), a highly stable fluorinated polymer, incorporating copper core-shell nanowires (NWs). The NWs comprised of copper and shelled with silver is highly antimicrobial, inducing a full kill effect against Escherichia coli and Staphylococcus epidermidis strains but biocompatible towards mammalian cells at concentrations below 0.5 mg mL −1 . Further NWs incorporation on PVDF matrix retains its antimicrobial activity reducing in 6.5 logs the E. coli and 4.5 logs the S. epidermidis. NW/PVDF composites demonstrate suitable mechanical and electrical characteristics for the development of capacitive sensing surfaces, allowing for the fabrication of an antimicrobial capacitive touch sensing matrix for interactive surfaces.

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Magnetic anisotropy in arrays of Ni, CoFeB, and Ni/Cu nanowires

Cited by 98 publications

References 17 publications

Extracting Individual Properties from Global Behaviour: First-order Reversal Curve Method Applied to Magnetic Nanowire Arrays

Extracting Individual Properties from Global Behaviour: First-order Reversal Curve Method Applied to Magnetic Nanowire Arrays

Static and dynamic magnetic properties of densely packed magnetic nanowire arrays

Multifunctional Touch Sensing and Antibacterial Polymer‐Based Core‐Shell Metallic Nanowire Composites for High Traffic Surfaces

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