Materials Literature
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The electromagnetic (EM) properties of composites with flake-like Ba3Co2Fe24O41(Co2Z) fillers synthesized using the molten-salt method were investigated. The results showed that the attenuation properties in these composites were greatly improved. The molten-salt method could be a potential way to enhance the properti…
Computation algorithm of the parameters of Jiles and Atherton (J-A) model of magnetic hysteresis has been briefly described in the paper. The basis of the algorithm is in the rational approximation of an unhysteretic curve of the material. The main advantages of the algorithm are: small amount of input data and simple…
We recently introduced a Preisach vector model for isotropic media. In this aper, we extend the model to anisotropic media by using the magnetization variation of the outside critical surface of the particle similar to the Stoner-Wohlfarth model. The resulting model can calculate efficiently the vector magnetization v…
Organismen, die Biominerale bilden, können die Suche nach neuen Wegen zu funktionalen Materialien wie Rutil für optische Funktionseinheiten leiten. Ausgehend von der Sequenz eines Siliciumdioxid bildenden Proteins einer Diatomee wurde ein rekombinantes Protein (rSilC) entworfen. Dieses einzigartige Protein induziert d…
Synthesis and characterization of transition metal (TM)-doped In2O3oxide is reported. Most of the samples were found to be paramagnetic, and only Fe and Cr co-doped sample showed as light trace of ferromagnetism at 300 K with saturation magnetization Ms= 0.35 emug/g. Measured transport properties revealed significant…
We report the synthesis of zinc-blende CrTe (zb-CrTe) as highly oriented crystalline grains in films of 100-nm thickness. The structural properties of the film were characterized using high-resolution transmission electron microscopy (HRTEM) and selective-area electron diffraction (SAED). Temperature-dependent magneti…
Ferromagnetism is observed at room temperature, when a small percentage (5%) of nonmagnetic titanium is added to zinc atoms to form Ti-doped ZnO nanoclusters in the oxygen atmosphere. The nanocluster films are prepared at room temperature by a technique that is a combination of high-pressure magnetron sputtering with…
This paper presents a review of the application of electrochemical techniques in studying the microbially influenced corrosion (MIC) process of metals and their alloys. Some electrochemical techniques used in microbiology and biofilm study are discussed as well as some classic electrochemical techniques, such as corro…
This work describes magnetically confined inductors using coplanar waveguide (CPW) lines. The fabrication uses antiferromagnetic exchange coupled iron-cobalt films with high ferromagnetic resonance frequency (5 to 7 GHz). A first type of inductors uses sandwiched lines and exhibits a linear density of inductance of 0.…
Surface charge patterns generated by atomic force microscopy-based charge writing were used to pattern amyloid-like peptide fibrils on a solid substrate. Fibrils of the short peptide TTR105-115 were encapsulated inside water droplets of a water-in-perfluorocarbon oil emulsion and retained their rod morphology. They we…
La(Fe1-xSix)13alloys with the NaZn13-type structure were prepared from rapidly solidified ribbons via a short annealing treatment. The rapid solidification process was realized by a laboratory scale melt-spinning apparatus and a large strip-casting facility. The rapidly solidified ribbons contained a large amount of t…
This paper deals with the performances of high-speed induction motors for turbo-molecular pump applications. A comparison between squirrel-cage and drag-cup motors is performed by a modeling and experimental analysis. Possible improvements to increase the drag-cup motor efficiency and to reduce rotor losses are invest…
In this study, we performed the synthesis and characterization of a new class of drug delivery system denominated magnetic nanoemulsion (MNE), which allows the combined action of PDT and HPT therapies, designed to work in a synergic way, leading to an expected enhancement of the tumor damage after minimum doses of hea…
A Terfenol-D continuous-fiber composite with a preferred [112] crystallographic orientation was fabricated by embedding 50-vol% [112]-oriented Terfenol-D continuous fibers of 45 mm long and 1 mm wide in an epoxy matrix, and its magnetic and magnetostrictive properties were evaluated as a function of magnetic field. A…
Iron losses due to flux harmonics in stator cores of pulsewidth-modulation [PWM] inverter-fed induction motors have a major effect on system efficiency. Novel direct ac-ac matrix converters involve no dc-link function and enable adjustment of power factor. This paper presents experimental results of magnetic losses in…
Tin-doped anatase TiO(2) nanopowders and nanoceramics with particle sizes between 12 and 30 nm are investigated by X-ray absorption fine-structure (EXAFS) and Mössbauer spectroscopies. Furthermore, ab initio calculations based on the density functional theory are performed to analyze changes in the electronic structur…
Gilbert's damping constants,$alpha$, of Ni-Fe and Ni-Co thin films are determined by Q-band ferromagnetic resonance (FMR) analysis.$alpha$is calculated from the resonance width of the FMR spectrum.$alpha$of Ni$_85$Fe$_15$film is found to be 0.0034, which is one-fourth of those of Ni film$(alpha =0.013)$and Co$(alpha =…
Bulk anisotropic composite Nd14Fe79.5Ga0.5B6/alpha-Fe magnets with (BH)max=45-55 MGOe were synthesized by compacting Nd-Fe-Ga-B powders coated with thin alpha-Fe layers followed by hot compaction at 600degC to 700degC and hot deformation (die upsetting) at 850degC to 950degC with a height reduction of 71%. The coating…
We present molecular dynamics (MD) studies of the liquid structure, thermodynamics, and dynamics in a one-component system described by the Ercolessi-Adams embedded atom method potential for Al. We find two distinct noncrystalline phases in this system. One of them is a liquid phase and the second phase has similar st…
The corrosion behavior of as-cast AZ91D magnesium alloy in 0.1M sodium sulfate solution at the corrosion potential (Ecorr) was investigated by using electrochemical impedance spectroscopy (EIS), environmental scanning electron microscopy (ESEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). T…