Materials Literature
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We studied the transport, magnetic, and structural properties of spinel ${\mathrm{MnTi}}_{2}{\mathrm{O}}_{4}$ and V-doped samples, ${\mathrm{MnTi}}_{2\ensuremath{-}x}{\mathrm{V}}_{x}{\mathrm{O}}_{4}$, to clarify the relation between charge, spin, and orbital degrees of freedom of $3d$ electrons in this series of compo…
A study of the magnetostructural phase transition and related magnetic entropy changes, DeltaSM, in the vicinity of a first-order magnetostructural transition, in polycrystalline shape memory alloys Ni2+xMn1-xGa (x=0.16,0.17,0.18,0.19,0.20) have been done. Thermal expansion measurements reveal the gradual overlap of t…
The optical properties of 0.65Pb(Mg 1/3 Nb 2/3 )O 3 –0.35PbTiO 3 (PMN–0.35PT) single crystals were investigated by means of the optical transmittance spectrum. The refractive indices were measured in the visible region, and the dispersion behaviours of ordinary and extraordinary lights were well described in terms of…
The synthesis, structure, EPR, and magnetic studies of two dodecanuclear heterometallic cyclic clusters are reported. The compounds have the general formula [R(2)NH(2)](2)[Cr(10)Cu(2)F(14)(O(2)CCMe(3))(22)] (R=Me, 1 or iPr, 2). Both structures contain an array of metal centers which describe an approximate "hourglass"…
This paper presents the rotational power loss P, curves measured for nonoriented, conventional grain-oriented and high-permeability grain-oriented electrical steel under controlled loci of flux density B, or magnetic field H. The P is measured at 10, 50, and 250 Hz with the radius of circular loci of B being controlle…
Polyhedral oligomeric silsesquioxanes epoxy resin (POSSER) was prepared from 3-glycidypropyl-trimethoxysilane (GTMS) and tetramethylammonium hydroxide (TMAH) by hydrolytic condensation. POSSER was characterized using Fourier-transformed infrared spectroscopy (FTIR), 1H-NMR, and liquid chromagraphy/mass spectrometry (L…
A [2 x 2] heterometallic [Fe(III)2Ni(II)2] ferrimagnetic, square-grid complex has been synthesized by the self-assembly reaction of a mononuclear Fe(III) precursor with Ni(NO3)2. Intramolecular antiferromagnetic exchange through the resulting hydrazone O-bridging framework (M-O-M 133.3-136.4 degrees) leads to an S = 3…
Inelastic neutron scattering measurements are reported for a powder sample of the spin-$1∕2$ quantum paramagnet $\mathrm{Cu}(\text{quinoxaline}){\mathrm{Br}}_{2}$. Magnetic neutron scattering is identified above an energy gap of $1.9\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$. Analysis of the sharp spectral maximum at th…
Molecular dynamic simulation has been done to determine the dynamic and local structure of liquid alumina at 3000 K. Fourteen different systems at densities ranging from 2.5 to 4.5 g cm−3 was prepared by compressing the low-density melt. Two kinds of pore aggregation, pore cluster and pore tube, were examined. Clear e…
Amphiphilic biodegradable graft copolymer, poly(vinyl alcohol)-graft-poly(p-dioxanone) (PVA-g-PPDO), was used to prepare a new biodegradable material by blending with poly(p-dioxanone) (PPDO). The in vitro degradation properties of the copolymer and blends with different contents of PVA-g-PPDO were studied in phosphat…
The adsorption of hydrogen molecules on the titanium metallocarbohedryne (met-car) cluster has been investigated by using the first-principles plane wave method. We have found that, while a single Ti atom at the corner can bind up to three hydrogen molecules, a single Ti atom on the surface of the cluster can bind onl…
The temperature dependence of the magnetic anisotropy of magnetoelastic chromium-substituted cobalt ferrites (CoCrxFe2-xO4with 0 les x les 0.8) was investigated over the temperature range 10-400 K. The first-order cubic anisotropy coefficient K1was calculated by fitting the high-field regimes of the major hysteresis l…
Experimental data on details of SET (crystalline) to RESET (amorphous) transition are presented for Ge2Sb2Te5(GST) nonvolatile memory cell. It is shown that the main source of heat for a SET to RESET transition is the GST bulk and interface regions instead of the contacting electrode. A small-contact-area electrode is…
Linear and cyclic polylactic acids (PLAs) were characterized using electrospray ionization mass spectrometry (ESI-MS) as part of our ongoing investigation of the hydrolysis mechanism of biodegradable polymers. The condensation oligomers of linear polylactic acid (LPLA) were synthesized by thermal dehydration of L-lact…
We fabricated toggle magnetic random access memories with clad writing lines. First, we evaluated the structures and magnetic properties of sputter-deposited cladding layers. The substrate bias during the deposition affected not only the sidewall coverage, but also the crystallinity and magnetic properties of the clad…
In order to enhance magnetic properties of hybrid Pr2(Fe,Co)14B/PrCo5magnets, partial substitution of Fe for Co in the PrCo5component was made. This substitution resulted in significant deterioration of intrinsic coercivity of PrCo5and of the hot compacted hybrid Pr2(Fe,Co)14B/PrCo5. However, after hot deformation, th…
Two-electron Coulomb interaction and correlation effects in several spherically symmetric zero-dimensional semiconductor heterostructures are investigated in the large dielectric mismatch regime. Specifically, a semiconductor quantum dot (QD) embedded in air or a vacuum, an air-filled nanocavity in a semiconductor mat…
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…