Materials Literature
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Recently a heat-proof magnetic domain refining technique has been developed which is characterized by the introduction of grooves on a surface of steel sheet after final cold rolling. In this paper, magnetic properties and the domain refining effect of grooving are investigated. A grooving process is constituted by re…
Hexagonal barium ferrite films have been grown on microcrystalline carbon substrates for the first time and thermally oxidized SiO2/Si wafers using dc facing targets sputtering. Si3N4 and SiO2/Cr underlayers were effective in preventing carbon diffusion into the barium ferrite films during deposition at high temperatu…
The compound Mn3Ga (70–74 at.% Mn) has the hexagonal DO19-type structure, and a triangular antiferromagnetic spin structure with a weak ferromagnetic component below the Néel temperature of about 470 K. Below 170 K the hexagonal structure is distorted to an orthorhombic one, accompanied by a steep increase in the ferr…
Mössbauer studies were carried out at 77 K in two series of R2Fe17 compounds with a magnetic (Sm) and nonmagnetic (Y) rare-earth, intercalated with H, C, and N. The increase in hyperfine field is largest at the 12j(18f) sites for R2Fe17H3.7 and R2Fe17N2.3. While the lattice expansion in R2Fe17C2 is similar to that in…
The physical properties of the copper polyaniline vermiculite intercalation compound [Cu(PANI)-VIC] have been studied by x-ray diffraction, electrical resistivity, and dc-magnetic-susceptibility measurements. Aniline is intercalated into the interlamellar space of Cu-VIC, where the ${\mathrm{Cu}}^{2+}$ ions act as oxi…
Raman-scattering spectroscopy has been used to study the folded longitudinal-acoustic (FLA) phonons in three- and four-layer superlattices comprised variously of slabs of GaAs, ${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Al}}_{\mathit{x}}$As, and AlAs. For each superlattice, the observed FLA peak fre…
We study the magnetic properties of soft ferromagnetic cores in the low field linear regime at low temperature (T≤4.2 K) in view of their use in connection with superconducting quantum interference device magnetometers. We have tested several amorphous and polycrystalline alloys in the form of strip-wound toroidal cor…
Thin films of Ba-hexaferrite of the magnetoplumbite structure have been prepared on sapphire substrates of orientation (112̄0), (11̄02), and (0001). Torque magnetometry indicates easy axes parallel, tilted off parallel, and perpendicular to the substrate for the A-, R-, and C-plane substrates. X-ray diffraction shows…
Abstract By means of reflection‐absorption infrared spectroscopy, interfacial interactions were studied between hydrated aluminium and two ethylene copolymers, poly(ethylene‐c‐butyl acrylate) (EBA) and poly(ethylene‐c‐acrylic acid) (EAA). The hydrated aluminium surfaces were obtained by immersion in boiling water, whi…
Remanence studies in recent years have used the characteristics of the Henkel plot and the delta-M plot in the interpretation of interaction field effects in particulate magnetic media. Studies of these two plots in ordered BaFe coatings, however, indicate that both plots give inadequate description of interaction fie…
Moving-type Preisach-derived models computing both the irreversible and the locally reversible components of the magnetization accurately characterize magnetic recording materials exhibiting hysteresis. Experimental results show that the derivative of the major remanent loop is not a symmetrical function of the applie…
Al substitution effects on the magnetic properties of RCo5 (R=Y, Pr, Nd, and Sm) are studied on the basis of magnetic measurements for RCo5−xAlx with x less than 2. The Al substitution considerably decreases the Curie temperature, the Co-sublattice moment, the magnetocrystalline anisotropy of the R sublattice as well…
Amorphous SmCo films were sputter synthesized at room temperature in the presence of strong in-plane magnetic fields. Both in-the-film-plane and perpendicular anisotropy could be formed in the films depending upon the film preparation conditions. Post deposition annealing in the presence of in-plane magnetic fields di…
Using time-resolved high-resolution electron-energy-loss spectroscopy, nonequilibrium adsorption of CO on Pt(111) has been measured and quantitative comparison made with equilibrium absorption over the whole range of coverage between 300 and 100 K. It is unambiguously shown that there is no site conversion of CO betwe…
A new phase δ in the ternary system Nd-Fe-Cu is identified as Nd6Fe13Cu. X-ray powder diffraction patterns of a sample annealed at 540 °C for 1000 h are indexed on a tetragonal unit cell with a=8.09 Å and c=22.26 Å. The Curie temperature Tc is 190±5 °C and the small net magnetization at 4.2 K of 18 mT (2 J T−1 kg−1) a…
The electrical impedance and the optoelectrical impedance due to electron-hole recombination in the depletion layer and at the surface of a semiconductor electrode are calculated. It is shown that both types of impedance follow from a common formula for the ac recombination current density in the external circuit, whi…
When cycling a hysteresis loop, bursts of high frequency ultrasonic waves are emitted. This general phenomenon, which must not be confused with the classical magnetostrictive effect at twice the cycling frequency, is called the magnetoacoustic emission (MAE). By using literature and authors’ results, qualitative and q…
This paper describes the results of a study undertaken to determine the sensitivity and reproducibility of a commercially produced alternating gradient force magnetometer. A noise base of 2×10−8 emu is achievable with an averaging time of 1 s. Reproducibility was found to be within 6% for most samples, but increases t…
The third-order nonlinear optical susceptibility χ(3)(−3ω;ω,ω,ω) of propylmethylpolyazine thin films as measured by the third harmonic generation is reported. The χ(3)(−3ω;ω,ω,ω) values of propylmethylpolyazine that possess statistically alternating methyl and propyl substituents on the carbon atoms along the conjugat…
We have studied the structural properties of Molecular Beam Epitaxy grown thin Co films on α-sapphire (112̄0) substrates by high resolution x-ray scattering measurements in the thickness range of 100 Å to 5000 Å. The electron density profile perpendicular to the film plane was determined by x-ray specular reflectivity…