Materials Literature
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Self-biased millimeter-wave circulators can be built using hexaferrite materials with high internal anisotropy field, thus avoiding the use of large and heavy permanent magnets. The design principles of these devices are considered thoroughly in the article for both below- and above-resonance circulators. The article…
It has been demonstrated that the linear-chain charge-transfer salt, decamethylferrocenium tetracyanoethanide (DMeFc)(TCNE), is a ferromagnet with a transition temperature of ∼4.8 K. This low-temperature 3D ordering has been attributed to a strong intrachain and a weak interchain interaction. To study these interactio…
Crystallographic parameters of Cr1−xMxAs (M=Ti, Mn, Fe, Co, and Ni; x≤0.1) and CrAs1−xXx (X=P and Sb; x≤0.1) have been precisely determined as a function of temperature from 77 to 320 K. Discontinuous changes of lattice parameters have been observed at the Néel temperature. By this crystallographic method, the Néel te…
Magnetization measurement for oriented single crystals of (DMe-DCNQI- d 8 ) 2 Cu (DMe-DCNQI=2,5-dimethyl- N , N ′ -dicyanoquinonediimine) revealed weak ferromagnetism with spontaneous magnetization perpendicular to the c -axis below 8 K. From the anisotropy of magnetic susceptibility and spin-flop-type magnetization c…
The aim of this paper is to propose a numerical model of the magnetic behavior law of soft materials based on the equivalence between the vectorial B(H) relationship and a compact representation using the coenergy density w′ as a function of the magnetic field H. The experimental data needed are the B(H) curves in the…
It is shown that during diffusional growth of the intermediate phase between substances A and B for cylindrical and spherical samples, the total diffusion flux relative to the center, −S(r)D̃∂c/∂r, where S is the area of the interface, varies by a small amount in the radial direction, despite the concentration depende…
Cobalt ferrite, CoxFe3−xO4 with 0.55≤x≤0.8, is produced by precipitation from aqueous solutions. Drying and annealing at temperatures below 300 °C results in a coercivity that increases with increasing temperature. Mössbauer effect spectroscopy and magnetic measurements are consistent with the interpretation that thes…
The frequency dependence of the transverse biased permeability μ′t(f ) has been measured up to 250 MHz in thin (0.044 μm) and thick (2.1 μm) unpatterned sputtered permalloy films with uniaxial anisotropy. In these films, the initial permeability along the hard axis can be described by the classical eddy current dampin…
High-resolution neutron powder diffraction measurements with λ=1.8232 Å and collimation of 6′-20′-6′ on Nd2Fe17Nx with x=0, 2.85, and 2.91 were carried out at room temperature. Structural parameters and magnetic moments were determined by the Rietveld profile-fitting calculation. The magnetic moments of iron atoms inc…
For an investigation of the growth and the structure of thin Ag films on Pd(111), the angular distribution of core-level photoelectrons emitted at high kinetic energy (>500 eV) was measured with a two-dimensional display-type electron spectrometer. At room temperature, Ag grows epitaxially on Pd(111) in the layer-b…
Micromagnetic analysis using a finite-element technique confirms that intergrain magnetostatic and exchange interactions drastically affect the magnetization reversal mechanism in nucleation controlled permanent magnets. The investigation of the nucleation fields of magnetically coupled grains emphasizes the important…
The effect of different spinless solvents on the magnetism of V(TCNE)x⋅y(solvent) (TCNE=tetracyanoethylene) is studied by temperature (T) dependent ac susceptibility above 2.3 K. Though V(TCNE)x⋅y(CH2Cl2) has a critical temperature Tc ∼400 K, for V(TCNE)x⋅y(C4H8O), Tc ∼205 K and the coercive field is reduced, while fo…
We present charge transport studies on recently developed molecular-based magnets V(TCNE)x⋅y(solvent) (TCNE=tetracyanoethylene) which show local magnetic ordering at temperatures, T, as high as 400 K. V(TCNE)x⋅y(solvent) prepared from the solvent CH2Cl2 has σ(300 K)∼10−3 S/cm, and that prepared from the solvent CH3CN…
The dynamic structure factor S(q,\ensuremath{\omega}) of electrons in single-crystal Al metal was measured with 1.4-eV resolution by means of inelastic x-ray-scattering spectroscopy for q parallel to [100] and for q parallel to [110] with 0.37q2.06 a.u. using synchrotron radiation from DORIS storage ring. The overall…
Melt-spun Nd–Fe–B ribbons containing small amounts of Co, Ga, and C were die upset to 60% and 70% reduction in height in an argon atmosphere between 750 and 800 °C. The magnet, which was die upset 70%, has a remanence of 14.2 kG, Hci of 14.8 kOe, and (BH)max of 48 MG Oe. The interior of the magnet consists of well-ali…
Dynamics of amorphous cis-1,4-polybutadiene was studied by incoherent inelastic and quasielastic neutron scattering below 10 meV in a wide temperature range covering the glass transition temperature Tg. The spectra at low temperatures below Tg show a broad excitation peak at about 2–3 meV, which is the so-called low-e…
New isotropic vector Preisach-type models of hysteresis are introduced. These new models contain additional unknown functions. This presents the opportunity to incorporate more experimental data in the identification process than in the case of previously suggested vector Preisach models, thus leading to more accurate…
The magnetic properties of materials containing rare earth ions coupled to the stable organic radicals nitronyl nitroxides are reported. When the rare earth ions are nonmagnetic, like yttrium(III) and europium(III), the materials behave as one-dimensional antiferromagnets, the coupling between the radicals being deter…
Abstract It has been found that three possible mechanisms can contribute to the improvement in fibre/resin adhesion when high‐modulus polyethylene fibres are subjected to oxygen gas plasma treatment. These mechanisms are surface oxidation, cross‐linking and surface etching. In this paper it is attempted to estimate th…
High-resolution photoemission studies of oxidation of the Al(111) surface have been performed. The appearance of a component at lower binding energy than the metallic bulk Al emission in the Al 2p spectrum at oxygen exposures above \ensuremath{\sim}50 langmuir (1 L = ${10}^{\mathrm{\ensuremath{-}}6}$ Torr s) is argued…