Theory of interlayer exchange coupling
This paper contains the notes of lectures on the theory of interlayer exchange coupling presented at the 30-th Ferienschule of the Institut fuer Festkoerperforschung, Forschungszentrum Juelich, March 1999.
Materials Literature
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This paper contains the notes of lectures on the theory of interlayer exchange coupling presented at the 30-th Ferienschule of the Institut fuer Festkoerperforschung, Forschungszentrum Juelich, March 1999.
New framework materials composed of well-defined vanadium oxide clusters were prepared by low-temperature reactions and characterized by X-ray crystal structure analysis. The structures of these solids contain {V18O42} cages linked into two interpenetrating three-dimensional networks by bridging {M(H2O)4} groups (M=Fe…
In a recent Letter, Roling et al. [Phys. Rev. Lett. 78, 2160 (1997)] proposed a novel scaling approach, requiring no arbitrary parameters, for the analysis of the ac conductivity resulting from ionic motion in glasses. However, this approach cannot be applied to alkali germanate glasses whose alkali content varies by…
Noncompatibilized and compatibilized ABS–nylon1010 blends were prepared by melt mixing. Polystyrene and glycidyl methacrylate (SG) copolymer was used as a compatibilizer to enhance the interfacial adhesion and to control the morphology. This SG copolymer contains reactive glycidyl groups that are able to react with PA…
Meltrheological behavior, phase morphology, and impact properties of isotactic-polypropylene (iPP)-based blends containing ethylene–propylene copolymer (EPR) synthesized by means of a titanium-based catalyst with very high stereospecific activity (EPRTi) were compared to those of iPP/EPR blends containing EPR copolyme…
The results of a comparison between the effects of sodium hydroxide and calcium hydroxide on poly(ethylene terephthalate) fabrics are presented. Calcium hydroxide can produce weight-loss effects similar to an aqueous solution of sodium hydroxide. The effects of some treatment variables on weight loss, fiber diameter,…
The reactions between hexamethylenetetramine (HMTA) and compounds which model novolac resins have been studied by 13C- and 15N-NMR techniques. The dimer and tetramer compounds vary in molecular size and structure and react with HMTA to yield benzylamines and benzoxazine as the major initial-formed intermediates and co…
O crescente interesse em ampliar a previsibilidade dos fenômenos que ocorrem durante a fabricação de materiais cerâmicos por processos coloidais, como a variação da viscosidade de suspensões, tem estimulado a implantação de vários modelos teóricos com tal finalidade. Considerando a concentração de sólidos na suspensão…
Thin films of SrBi2Ta2O9 (SBT) were deposited on Si using Sol-Gel technique. The thicknesses of the films 200 nm (SBT2) and 400 nm (SBT4), respectively. SEM were studies showed most of the grains in the film are smaller than 0.1 μ. FTIR reflectivity measurements of the samples showed bands around 1260, 936(for SBT2),…
This paper presents experimental data on the bonding of CO and NO to vacuum-cleaved MgO(100) and NiO(100) and compares them with theoretical results. In the case of CO and NO on NiO(100) we find that the bonding energies obtained for the vacuum-cleaved single crystals agree well with results of recent studies on thin…
In EXAFS analysis of Rb-doped silicate glasses and of cetyltrimethylammonium bromide (CTAB) adsorbed on carbon black, the spline approximation of the atomic background is inadequate. Instead, a residuum obtained from absorption spectra of Rb and Br ions in aqueous solution after removal of the structural signal is use…
A bleomycin-binding protein, designated BLMT, encoded on the transposon Tn5 was crystallized using the vapour-diffusion method in a form suitable for X-ray diffraction analysis. Crystals were grown at pH 6.5 in 0.1 M sodium cacodylate and 0.2 M calcium acetate, using 25% PEG 6000 as a precipitant. They belong to the o…
Abstract The high-temperature γ -phase of lithium sodium carbonate ( γ -LiNaCO 3 , a = 8.311 Å, c = 3.386 Å, P [unk]) has been studied by X-ray diffraction and computer simulation methods. The results of computer simulation based on the ionic model and the temperature dependence of the superlattice reflection intensit…
A new method to measure the effective charge density responsible for the enhanced particle capture of electret filters is reported. The experimental method relies on the use of ionizing radiation from a Po210 radioactive source combined with measurements of the penetration of particles of known size and charge through…
In the present work, the positive-definite conditions of the elastic constants of two-dimensional (2D) quasicrystals with non-crystallographic symmetries have been derived. These results are necessary for studying elastic and mechanical properties of two-dimensional quasicrystals both in theory and in experiment. Proj…
The point defect structure of a doped oxide, (Mg~_xFex)~.80, was quantitatively determined by in situ high temperature X-ray absorption spectroscopy (1270 K<T<1470 K). Spectra were recorded under defined oxygen activity at the dopanrs K-edge. The degree of oxidation o~ versus T, ao, and x can be consistently described…
Abstract The structure of a compound previously described as Bi 8 Se 9 Cl 6 has been determined and refined to R = 0.040. It is very similar – if not identical – to the structure of a compound described as Bi 11 Se 12 Cl 9 . In contrast to the latter, it accounts for a weak fourfold superstructure and therefore differ…
The ability of digital PD analyzers to process and store specific information concerning discharge activity can be used for various purposes: discharge recognition and condition monitoring. To exploit these possibilities, a specific fingerprint technique has been successfully used in recent years for off-line and on-l…
The fracture characteristics of high‐strength steel ASTM A‐490 under a hydrogen environment were investigated, with special emphasis placed on changes in fracture characteristics due to a tempering treatment at temperatures from 200 to 400 °C. A mechanical test was performed on cathodically charged specimens subjected…
By determining sound pressure using the Ramann-Nath parameter and confirming sound form based on schlieren images, we investigated the effects of ultrasound frequency on the sonochemical luminescence of a luminol solution. Separating the effect into the luminescence threshold of sound energy and the rate of luminescen…