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Magnetization reversal in FeCo binary alloy nanowire arrays

Zhao Rong,Gu Jian-Jun,Liu Li-Hu,Xu Qin,Cai Ning,Sun Hui-Yuan,

物理学报 , 2012,
Abstract: Arrays of FexCo1-x(0≤x≤0.51) binary alloy nanowires are fabricated into the(anodic aluminum oxide) AAO template pores by AC electrodeposition.The XRD pattern indicates that the crystallite structure of Co nanowire is hcp with existence of strong(100) orientation along the nanowire axis.While the crystallites structure of FeCo binary alloy nanowires is bcc with existence of strong (110) orientation along the nanowire axes.The peaks shift toward the lower angle when the Fe content of nanowire increases.At room temperature,magnetic measurement results show that FeCo alloy nanowires exhibit excellent magnetic properties.The introduction of Fe improves the magnetic property of Co nanowire compared with that of the Co nanowire.FeCo binary alloy nanowire has a larger coercive force and squareness ratio.The coercivity of the FeCo alloy nanowire is calculated by using a magnetization reversal model based on "chains of spheres" with coherence rotation mechanism and symmetric fanning mechanism.The magnetization reversal mechanism is supported by "chains of spheres" with symmetric fanning mechanism.
Fabrication of Conducting Si Nanowire Arrays  [PDF]
E. Johnston-Halperin,R. A. Beckman,N. A. Melosh,Y. Luo,J. E. Green,J. R. Heath
Physics , 2004,
Abstract: The recent development of the superlattice nanowire pattern transfer (SNAP) technique allows for the fabrication of arrays of nanowires at a diameter, pitch, aspect ratio, and regularity beyond competing approaches. Here, we report the fabrication of conducting Si nanowire arrays with wire widths and pitches of 10-20 nm and 40-50 nm, respectively, and resistivity values comparable to the bulk through the selection of appropriate silicon-on-insulator substrates, careful reactive-ion etching, and spin-on glass doping. These results promise the realization of interesting nano-electronic circuits and devices, including chemical and biological sensors, nano-scale mosaics for molecular electronics, and ultra-dense field-effect transistor (FET) arrays.
Angular dependence of magnetic properties in Ni nanowire arrays  [PDF]
R. Lavín,J. C. Denardin,J. Escrig,D. Altbir,A. Cortés,H. Gómez
Physics , 2010, DOI: 10.1063/1.3257242
Abstract: The angular dependence of the remanence and coercivity of Ni nanowire arrays produced inside the pores of anodic alumina membranes has been studied. By comparing our analytical calculations with our measurements, we conclude that the magnetization reversal in this array is driven by means of the nucleation and propagation of a transverse wall. A simple model based on an adapted Stoner-Wohlfarth model is used to explain the angular dependence of the coercivity.
Nanowire Growth for Sensor Arrays  [PDF]
Minhee Yun,Nosang V. Myung,Richard P. Vasquez,Jianjun Wang,Harold Monbouquette
Physics , 2003, DOI: 10.1117/12.507189
Abstract: A design concept for nanowire-based sensors and arrays is described. The fabrication technique involves electrodeposition to directly grow nanowires between patterned thin film contact electrodes. To prove our concept, we have electrodeposited 1-mm diameter Pd single wires and small arrays. To demonstrate nanowire sensors, we have electrochemically grown metal (Pd, Au, Pt), metal oxide (Sb2O3), and conducting polymer (polyaniline) bundled nanowires. Using Pt bundled nanowires surface modified with glucose oxidase, we have demonstrated glucose detection as a demonstration of a biomolecular sensor.
Fabrication and optical properties of platinum nanowire arrays on anodic aluminium oxide templates
Gao Tie-Ren,Chen Zi-Yu,Peng Yong,Li Fa-Shen,

中国物理 B , 2002,
Abstract: Arrays of Pt nanowires, fabricated by electrodepositing Pt metal into nanoporous anodic aluminium oxide (AAO) templates, exhibit a preferable optical absorption band in the ultraviolet-visible (UV-VIS) spectra and present a blueshift as the wire aspect ratio increases or its radius decreases. This type of optical property of Pt nanowire/porous alumina composites has been theoretically explored using Maxwell-Garnett (MG) effective medium theory. The MG theory, however, is only applicable to nanowires with an infinitesimally small radius relative to the wavelength of an incident light. The nanowire radius is controlled by the pore radius of the host alumina, which depends on anodizing conditions such as the selected electrolyte, anodizing time, temperature and voltage. The nanowire aspect ratios depend on the amount of Pt deposited into the nanopores of AAO films. The optical absorption properties of the arrays of Pt nanowires with diameters of 24, 55 and 90 nm have been investigated by the UV-VIS spectra, which show that the extinction maximum (λmax) shifts to shorter wavelength side as the wire aspect ratio increases or its radius decreases. The results are qualitatively consistent with those calculated based on the MG theory.
Fabrication of Polypyrrole Nanowire and Nanotube Arrays  [PDF]
Fa-Liang Cheng,Ming-Liang Zhang,Hong Wang
Sensors , 2005, DOI: 10.3390/s5040245
Abstract: Large area highly uniform and ordered polypyrrole nanowire and nanotubearrays were fabricated by chemical oxidation polymerization with the help of a porousanodic aluminium oxide (AAO) template. Under 0.2 moL/L pyrrole (H2O) and 0.2 moL/LFeCl3 (H2O) pattern, polypyrrole nanowire arrays were obtained after 2.0 hourspolymerization reaction in a two-compartment reaction cell. When the reaction wasstopped after 15 minutes, polypyrrole nanotube arrays have been formed. The diameter,length and density of compositive nanowires and nanotubes could be controlled byparameters of AAO template.
Morphology-dependent field emission properties and wetting behavior of ZnO nanowire arrays  [cached]
Yao Lujun,Zheng Maojun,Ma Li,Li Wei
Nanoscale Research Letters , 2011,
Abstract: The fabrication of three kinds of ZnO nanowire arrays with different structural parameters over Au-coated silicon (100) by facile thermal evaporation of ZnS precursor is reported, and the growth mechanism are proposed based on structural analysis. Field emission (FE) properties and wetting behavior were revealed to be strongly morphology dependent. The nanowire arrays in small diameter and high aspect ratio exhibited the best FE performance showing a low turn-on field (4.1 V/μm) and a high field-enhancement factor (1745.8). The result also confirmed that keeping large air within the films was an effective way to obtain super water-repellent properties. This study indicates that the preparation of ZnO nanowire arrays in an optimum structural model is crucial to FE efficiency and wetting behavior.
Synthesis and magnetic properties of Fe100-xMox alloy nanowire arrays

Gao Hu,Gao Da-Qiang,Xue De-Sheng,

中国物理 B , 2011,
Abstract: The Fe100-xMox (13 < x < 25) alloy nanowire arrays are synthesized by electrodeposition of Fe2 + and Mo2 + with different ionic ratios into the anodic aluminum oxide templates. The crystals of Fe100-xMox alloy nanowires gradually change from polycrystalline phase to amorphous phase with the increase of the Mo content and the nanowires are of amorphous structure when the Mo content reaches 25 at%, which are revealed by the X-ray diffraction and the selected area electron diffraction patterns. As the Mo content increases, the magnetic hysteresis loops of Fe100-xMox alloy nanowires in parallel to the nanowire axis are not rectangular and the slopes of magnetic hysteresis loops increase. Those results indicate that the magnetostatic interactions between nanowires and the magnetocrystalline anisotropy both have significant influences on the magnetization reversal process of the nanowire arrays.
Study of spin dynamics and damping on the magnetic nanowire arrays with various nanowire widths  [PDF]
Jaehun Cho,Yuya Fujii,Katsunori Konioshi,Jungbum Yoon,Nam-Hui Kim,Jinyong Jung,Shinji Miwa,Myung-Hwa Jung,Yoshishige Suzuki,Chun-Yeol You
Physics , 2015,
Abstract: We investigate the spin dynamics including Gilbert damping in the ferromagnetic nanowire arrays. We have measured the ferromagnetic resonance of ferromagnetic nanowire arrays using vector-network analyzer ferromagnetic resonance (VNA-FMR) and analyzed the results with the micromagnetic simulations. We find excellent agreement between the experimental VNA-FMR spectra and micromagnetic simulations result for various applied magnetic fields. We find that the demagnetization factor for longitudinal conditions, Nz (Ny) increases (decreases) as decreasing the nanowire width in the micromagnetic simulations. For the transverse magnetic field, Nz (Ny) increases (decreases) as increasing the nanowire width. We also find that the Gilbert damping constant increases from 0.018 to 0.051 as the increasing nanowire width for the transverse case, while it is almost constant as 0.021 for the longitudinal case.
Fabrication of horizontal silicon nanowire arrays on insulator by ion irradiation
Xin Ou,Reinhard K?gler,Xing Wei,Arndt Mücklich
AIP Advances , 2011, DOI: 10.1063/1.3672074
Abstract: We report a simple and potentially mass productive technique to fabricate horizontal single crystalline Si nanowire arrays on insulating substrate based on a self-organized pattern formation mechanism during Xe+ ion beam irradiation of Si-on-insulator material. A periodic ripple surface pattern is created by ion irradiation at 67o incidence angle to the surface normal. The transfer of this pattern to the oxide interface results in an array of electrically disconnected parallel ordered Si nanowires on the insulating oxide. Doping of the nanowires was demonstrated by boron ion implantation and annealing. The morphology and resistivity of the narrow nanowires with large aspect ratio were analysed by cross sectional transmission electron microscopy and scanning spreading resistance microscopy, respectively. Physical reasons of the observed low carrier activation are discussed.
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