Giant magnetoresistance (GMR) is observed in a new type of nanostructured material consisting magnetic multilayered nanowires formed by electrodeposition into nanometer-sized pores template polymer membrane. The composition these modulated over nanometer length scales with distinct and nonmagnetic metallic layers. Magnetoresistance measurements the current perpendicular to layers were performed on array parallel nanowires. GMR about 15% was at room temperature Co/Cu

We report on the magnetic properties of arrays submicronic (35 nm-500 nm) Ni and Co wires fabricated by electrodeposition into cylindrical pores track-etched polymer membranes. This work reveals intrinsic differences between magnetization reversal mechanisms taking place in these two systems. For Ni, crystal anisotropy is small compared to shape lies along wire axis. In contrast, strong orientation easy axis (nearly perpendicular axis), allows for appearance a multidomain configuration, each...

Using a planar microstrip transmission line, the dipolar interactions in electrodeposited Ni nanowires arrays are characterized as function of membrane porosity (4% to 38%) and wire diameter (56 250 nm). The between wires can be modeled mean-field approach an effective uniaxial anisotropy field oriented perpendicular axis proportional porosity. interaction opposes self-demagnetization isolated single which keeps magnetization parallel axis. An increase therefore induces switching easy from...

An enhancement of the resistance due to presence only one or two isolated domain walls is clearly evidenced by transport measurements in 35 nm epitaxial Co wires, 20 &mgr;m long. The deduced relative change resistivity at least 1 order magnitude larger than predicted from a model based on mixing spin channels occurring over length scale wall width [P. M. Levy and S. Zhang, Phys. Rev. Lett. 79, 5110 (1997)]. This inconsistency can be resolved taking effect accumulation into account, which...

The first crystal structures of a dinuclear iron(II) complex with three N1,N2-1,2,4-triazole bridges in the high-spin and low-spin states are reported. Its sharp spin transition, which was probed using X-ray, calorimetric, magnetic, (57)Fe Mossbauer analyses, is also delineated crystalline state by variable-temperature fluorimetry for time.

We present the fabrication of vertically aligned cobalt nanowire arrays on planar surfaces as well preliminary field-emission (FE) experiments using them cold electron cathodes. These are obtained by electrodeposition into nanoporous templates Au/Ti/Si substrates at very low temperature (<100 °C). After removal template, consist statistically positioned vertical free-standing nanowires with high aspect ratios, uniform dimensions, and predetermined densities. The measurements show metallic...

The effects of the electrolytic bath acidity, or pH, on magnetic properties in arrays electrodeposited Co nanowires and their correlation with crystalline have been studied using ferromagnetic resonance. results show that, depending value pH electrolyte, appreciable changes effective anisotropy can be induced. These are attributed to modifications microstructure nanowires. In particular, quantification field shows that deposited wires set contain a dominant fraction Co-hcp phase c-axis...

We report an experimental study of guided transmission low-energy $(200--350\phantom{\rule{0.3em}{0ex}}\mathrm{eV})$ electrons through highly ordered ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ nanocapillaries with large aspect ratio ($140\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ diameter and $15\phantom{\rule{0.3em}{0ex}}\mathrm{\ensuremath{\mu}}\mathrm{m}$ length). The nanochannel array was prepared using self-ordering phenomena during a two-step anodization process high-purity aluminum foil....

Magnetic nanowires are attractive materials because of their morphology-dependent remarkable properties suitable for various advanced technologies in sensing, data storage, spintronics, biomedicine and microwave devices, etc. The recent advances synthetic strategies approaches the fabrication complex structures, such as parallel arrays 3D networks one-dimensional nanostructures, including nanowires, nanotubes, multilayers, presented. simple template-assisted electrodeposition method enables...

Spin caloritronics has recently emerged from the combination of spintronics and thermoelectricity. Here, we show that flexible, macroscopic spin caloritronic devices based on large-area interconnected magnetic nanowire networks can be used to enable controlled Peltier cooling electronic components with an external field. We experimentally demonstrate three-dimensional CoNi/Cu multilayered exhibit extremely high, magnetically modulated thermoelectric power factor up 7.5 mW/K2m large...

Micro-supercapacitors emerge as an important electrical energy storage technology expected to play a critical role in the large-scale deployment of autonomous microdevices for health, sensing, monitoring, and other IoT applications. Electrochemical double-layer capacitive requires combination high surface area electronic conductivity, with these being attained only porous or nanostructured carbons, recently found also conducting metal-organic frameworks (MOFs). However, techniques conformal...

We have prepared by electrodeposition Ni80Fe20/Cu multilayered nanowires into the pores of polymer membranes and performed giant magnetoresistance (GMR) measurements in current perpendicular to layer planes geometry. GMR ratios as high 80% been obtained at 4.2 K. Two types structure studied: conventional multilayers composed Ni80Fe20/Cu/Ni80Fe20 trilayers magnetically isolated long Cu rods.

The magnetization reversal of Ni nanowires was studied by anisotropic magnetoresistance measurements at temperatures between 15 and 300 K. wires, synthesized electrodeposition in a nanoporous polycarbonate membrane, are regular cylinders 22 μm long with diameter 75 or 35 nm. nucleation field measured on individual as function the angle applied wire axis. results quantitatively analyzed using classical theories. Measurements first obtained temperature evidence an extra uniaxial anisotropy...

In this letter we present a convenient way of controlling the direction uniaxial magnetocrystalline anisotropy in arrays electrodeposited hcp Co nanowires. Combining electron microscopy and ferromagnetic resonance measurements, it is shown that using an appropriate pH electrolytic solution, c axis can be oriented parallel or perpendicular to wires axes simply by changing deposition current density rate. This reorientation leads drastic change overall magnetic as crystal either competes for...

We have developed a new reliable method combining template synthesis and nanolithography-based contacting technique to elaborate current perpendicular-to-plane giant magnetoresistance spin valve nanowires, which are very promising for the exploration of electrical transfer phenomena. The allows connection one single nanowire in large assembly wires embedded anodic porous alumina supported on Si substrate with diameters periodicities be controllable extent. Both magnetic excitations switching...

Unbiased planar microwave circulators were fabricated by electrodeposition of NiFe nanowires into porous alumina templates. Microwave properties the devices are seen to depend drastically on height and newly developed exhibit improved features, compared existing nanowire-based designs. Thanks high anisotropy nanowires, zero-field circulation modes may be observed in a frequency range from 10 30 GHz, with isolation as large dB, well low insertion losses − 5 making it compatible industrial...

Track etched polycarbonate membranes produced using a double energetic heavy ion irradiation with fixed incidence angles as templates to fabricate crossed magnetic nanowire networks tunable anisotropy and microwave absorption properties.

We have investigated the magnetization reversal processes in arrays of sub-micron Ni and Co wires by means torque experiments together with micromagnetic calculations. The were produced electrodeposition cylindrical pores track-etched polymer membranes. Diameters range 35–400 nm been studied. nanowires display different magnetic behaviors. Particular emphasis is given to competing shape crystal anisotropies that exist nanowire system. In both systems, explaining experimental results requires...