Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The magnetic properties of R2Co14B1−xCx (x=0, 0.5 and R=Y, Sm) compounds have been studied by measuring the temperature dependence of the easy- and hard-magnetization curves on magnetically aligned samples between 1.5 and 300 K for Y2Co14(B,C) and at 4.2 K for Sm2Co14(B,C). The magnetic anisotropy of Y2Co14B increases…
A micromagnetic simulation program has been used to calculate the magnetoresistance of a free-standing 4 μm×1 μm×200 Å Permalloy strip for a variety of numerical hysteresis loops in which a constant bias field is applied along the easy axis and a variable field is applied along the hard, in-plane axis. The main purpos…
Magnetic properties of Sm1−xPrxCo4−yFeyB with various values of x and y have been observed mainly from the viewpoint of permanent magnet material. Pr substitution for SmCo4B results in an increase of the saturation moment; however, it leads to a decrease of the anisotropy field. The Curie temperature remains constant.…
The electronic structure of thick (>300 \AA{}) single-crystal Gd(0001) layers on W(110) has been studied by angle-resolved-photoelectron spectroscopy. Photoemission spectra measured with photon energies between 30 and 60 eV show intense 4f emission at 8.3-eV binding energy and 5d 6s--derived valence-band states wit…
The high field magnetization process in Sm2Fe17N3.0 has been investigated by using dc magnetic fields of up to 260 kOe generated by a hybrid magnet. It was found that the hard-axis magnetization at 4.2 K is only 78% of the easy-axis value in the field of 260 kOe, while at 296 K, it almost saturates at the same field,…
Hard magnetic Sm2Fe17Nx alloy powders with a coercivity of 5.6 kA/cm and a remanent polarization of 1 T, related to the density of 7.7 g/cm3, could be achieved by a combined heat treatment in hydrogen atmosphere and a successive nitrogenation. During nitrogenation SmFe3 and SmFe2 constituents decompose into SmN and αF…
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…