Materials Literature
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Light rare-earth metals are not assumed to form compounds of the CaCu5-type structure with iron. When zirconium was not added, the Th2Zn17-type rhombohedral structure existed in the samples of nominal composition SmFe5 and SmFe7. Samples of nominal composition (Sm1−xZrx)Fe5 and (Sm0.65Zr0.35)Fey were studied by x-ray…
Magnetization measurements have been made on (Y1−xSmx)2 Fe14B compounds with x≤0.1 over the temperature range from 1.5 K to room temperature. The c axis is the easy magnetization direction for pure Y2Fe14B at all temperatures, reflecting the anisotropy of the Fe sublattice. X-ray diffraction analyses on aligned powder…
The origin of high coercivities in as-cast RFe2Ni2B alloys is investigated by correlating the magnetic properties with the microstructure. Hysteresis loop measurements showed high coercivities in samples containing Sm and Er. In SmFe2Ni2B the coercivities could not be measured in a field of 80 kOe at 4.2 K but they de…
Thermal expansion measurements as a function of temperature and magnetic field were carried out on Fe-Ni-Cr and Fe-Ni-Mn alloys. The magnetic contribution to the thermal expansion was determined with respect to the paramagnetic reference samples in the Fe-Ni-Cr and Fe-Ni-Mn series. We observe a general behavior that a…
The present paper is concerned with the development of low-loss grain-oriented silicon steel, and especially with the magnetic properties and domain structures in domain refined grain-oriented silicon steel. The effects of locally induced stress and slight magnetic flux emergence have been examined as possible nucleat…
The mechanism of magnetostriction in rare-earth–transition-metal amorphous films was investigated based on a single ion anisotropy model for rare-earth atoms using a point charge approximation. The theory was compared with the observed magnetostriction in (Gd0.75R0.25)19Co81 films with various rare-earth elements R. T…
We measured the electrical resistivity at 4.2 K of a series of ${\mathrm{Co}}_{\mathrm{x}}$${\mathrm{Fe}}_{100\mathrm{\ensuremath{-}}\mathrm{x}}$ alloys in the ordered and disordered state. For 30x40 at. % Co the resistivity increases upon ordering as expected when an energy gap occurs at the Fermi level. For 40x70 at…
The absolute crystal structure of the deuterated dicalcium strontium propionate (DDSP) has been determined by the X-ray diffraction with a four-circle automatic diffractometer at three temperatures in each of the paraelectric and ferroelectric phases. The space group is determined to be D 4 4 -P4 1 2 1 2 or D 4 8 -P4…
The preferred orientation or crystallographic alignment of several NdFeB magnets has been studied by x-ray diffraction. A simple diffraction geometry was used, corresponding to a single line section across a pole figure. The (006) reflection was found to be the most useful for this purpose. Some practical problems of…
This paper discusses the elevated temperature performance of Nd-Fe-B magnets containing 0–15 wt. % cobalt substitutions for iron and 0–10 wt. % dysprosium substitutions for neodymium. Test samples were prepared using conventional powder metallurgy techniques. Elevated temperature hysteresis loop and open-circuit measu…
The effects of cobalt substitution on the hard magnetic properties of melt-spun neodymium-iron-boron materials are reported. Samples having the starting composition Nd0.135[(CoxFe1−x)0.95B0.05 ]0.865 with x=0, 0.05, 0.10, 0.15, 0.20, 0.35, 0.50, 0.75, and 1 were prepared by melt-spinning over a range of substrate surf…
Samples of Nd2(Fe1−xNix)14B, 0≤x≤0.20, with good phase homogeneity have been made by heating under vacuum for 300 h. 57Fe Mössbauer parameters have been determined for all six different iron crystallographic sites at room temperature. The nickel atoms preferentially substitute for iron atoms on the 16k2 and 8j2 sites.…
The electric, dielectric permittivity, loss tangent, microwave power absorption, and hysteresis loop parameters were studied on a series of cobalt-substituted lithium titanium ferrites. The experimental results indicate that cobalt substitution affect all these parameters. The observed dispersion in conductivity and d…
Calculated thermomagnetization curves for MnFe2 O4 and NiFe2 O4 have been matched to reported experimental results. Since both Mn2+ and Ni2+ ions are also strongly exchange coupled to the Fe3+ ions, separate sets of molecular-field coefficients were determined for each of these interactions and then averaged into the…
R2Fe14−xGaxB (R=Pr and Nd) and PrCo5−xGax alloys were synthesized and examined by powder x-ray diffraction at room temperature and by magnetometry in the temperature range 4.2–1100 K. Lattice parameters, Curie temperature, spin-reorientation temperatures, anisotropy fields, and saturation magnetizations were determine…
We report the magnetic susceptibility as a function of temperature (4<T<200 K) and magnetic field (1000<H<7000 Oe) of EuTe/PbTe superlattices grown by molecular-beam epitaxy. Three superlattices were used, consisting of four EuTe monolayers alternating with four PbTe monolayers (EuTe${)}_{4}$/(PbTe${)}_{4}…
A particular mechanism for domain-wall nucleation in thin (350 Å) Permalloy films of typical geometry (7×140 μm) used for magnetoresistive (MR) sensors is studied in detail. A numerical micromagnetic model is described which can theoretically predict an observed domain-wall process (including domain-wall creation, des…
We have extended the matrix representation of the dynamical theory of x-ray diffraction to include Bragg planes that are oblique with respect to the surface of a crystal wafer. In place of the two independent 2\ifmmode\times\else\texttimes\fi{}2 matrices of the Abel\`es method for planes parallel to the surface, we us…
Mössbauer spectra of Zn0.2Fe2.3O4 particles at different temperatures have been obtained. They have been analyzed with five components, one due to the A-site Fe3+ ions, and the others due to the B-site Fe3+ and Fe2+ ions. Magnetic and electronic properties have been discussed with regard to zinc substitution and tempe…
Magnetic properties, such as domain patterns and anisotropy, were measured for negative magnetostrictive Co-Si-B amorphous wires exhibiting large Barkhausen discontinuities and the results are compared to those of Fe-Si-B wires with positive magnetostriction. The Co-based wire was found to have a bamboolike domain str…