Materials Literature
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A method is described for the liquid chromatography/tandem mass spectrometry analysis of free base porphyrins, which allows the routine and rapid recognition of alkyl substituents in the components of complex natural mixtures. The method overcomes difficulties associated with probe tandem mass spectrometry or liquid c…
Post-transit photocurrent analysis, based on the time-of-flight transient photoconductivity technique, was successfully carried out for a series of amorphous selenium $(a\ensuremath{-}\mathrm{Se})$ thin films. The method allows a determination of the density of gap states beyond the shallow tail states from the emissi…
Coprecipitation and microemulsion were used to prepare nanosized magnetite. The average particle sizes of samples A and B were calculated by Brunauer–Emmett–Teller analysis and are 8.16 and 2.24 nm, respectively. The saturation magnetization of sample A at 300 K was 57.2 emu/g, but sample B was not saturated even 7.0…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of a Novel Oligo(p-phenylene) Ladder by Sulfide and Sulfonio GroupsAgus Haryono, Kenji Miyatake, Junichiro Natori, and Eishun TsuchidaView Author Information Department of Polymer Chemistry, Advanced Research Institute for Science and Engineering, Waseda University, T…
SmCo x – Co (x=3.5, 4, and 5) nanostructured multilayers have been prepared by dc and rf sputtering. Magnetic hardening has been found in the as-deposited thin films. The effects of the Co and hard-phase layer thicknesses and the effect of the Cr underlayer have been studied. Further magnetic hardening has been achiev…
An experimental and theoretical study is presented of the normal magnetic modes in spiral ferromagnetic structures. The bilayer system studied consists of Fe layers (25, 50, 100, and 200 Å thick) that are exchange coupled to 200 Å thick SmCo films that have ≈200 kOe anisotropies. The Fe spiral—induced by an external m…
A novel magnetic organogel that can be considered a precursor example of a magnetoresponsive gel is reported. The gel is formed by the bridging of ferrite containing anionic bis(2-ethlhexyl) sodium sulfosuccinate reverse micelles with 2,6-dihydroxynaphthalene (2,6-DHN). The addition of 2,6-DHN leads to a room temperat…
Fe 100−x Pt x alloy thin films with x=25–67 at. % were prepared by dc magnetron sputtering on naturally oxidized Si substrates. Effects of film composition, annealing temperature (300–650 °C), annealing time (5–120 min), and cooling rate (furnace cooling or ice water quench cooling) on the magnetic properties were inv…
The visible luminescence of ${\mathrm{Pr}}^{3+}$-doped fluoride ${\mathrm{LiKY}}_{1\ensuremath{-}x}{\mathrm{Pr}}_{x}{\mathrm{F}}_{5}$ crystals $(x=0.001,$ 0.01, 0.02, 0.03, 0.05, and 0.1) has been investigated as a function of concentration and temperature by using time-resolved laser spectroscopy. The temperature-dep…
A two-dimensional, dynamic, micromagnetic model of a thin strip of permalloy is described and used to model the magnetization dynamics of the strip as it is subjected to a transverse step field. The numerical results are compared to experimental data. The experimental precession frequency is matched by varying Hk, the…
We have grown ${\mathrm{Bi}}_{1\ensuremath{-}x}{\mathrm{Sb}}_{x}$ alloy thin films on $\mathrm{CdTe}(111)B$ over a wide range of Sb concentrations $(0<~x<~0.183)$ using molecular-beam epitaxy. Temperature-dependent electrical resistivity (\ensuremath{\rho}) and thermoelectric power (S) were studied. We have obse…
Effect of surface nonradiative recombination on kinetics and total yield of the interband photoluminescence (PL) of c-Si wafers excited at room temperature by short laser pulses is studied. Numerical simulations show that a correlation of the PL quenching with the surface defect density takes place even at the high ex…
A spectroscopic ellipsometry technique is used to attempt a quantitative analysis of thin Si/SiO2 nanocomposite films obtained by magnetron co-sputtering. The layers are first fabricated with varying values of deposition temperature and sputtered silicon area, before being annealed at different temperatures. Using an…
Sm ( Co bal Fe 0.1 Cu x Zr 0.033 ) z magnets with higher Cu content were found to have higher intrinsic coercivity Hci at both room temperature and higher temperatures up to 500 °C. For the magnets with a ratio z=8.5, the intrinsic coercivity reaches a maximum of about 40 kOe at room temperature when the Cu content x…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelf-Assembled Rigid-Rod IonophoresNaomi Sakai, Nirmalya Majumdar, and Stefan MatileView Author Information Department of Chemistry, Georgetown University Washington, D.C. 20057 Cite this: J. Am. Chem. Soc. 1999, 121, 17, 4294–4295Publication Date (Web):April 15, 1999P…
Extended vacuum annealing of rutile ${\mathrm{TiO}}_{2}(110)$ produces macroscopic and nanoscopic changes in the surface morphology. These result from the ordering of oxygen ${\mathrm{v}\mathrm{a}\mathrm{c}\mathrm{a}\mathrm{n}\mathrm{c}\mathrm{i}\mathrm{e}\mathrm{s}/\mathrm{T}\mathrm{i}}^{n+}$ interstitials in bulk ${…
Epitaxial CrO2 thin films have been grown on TiO2(100) and Al2O3(0001) substrates by atmospheric pressure chemical vapor deposition. The films have a Curie temperature (Tc) of around 393 K with the ones grown on TiO2 exhibiting in-plane uniaxial magnetic anisotropy. They also display metallic characteristics, with roo…
The quasiparticle density of states (DOS) in the vortex state has been probed by specific heat measurements under magnetic fields (H) for clean and dirty s-wave superconductors, Y(Ni1-xPtx)2B2C and Nb1-xTaxSe2. We find that the quasiparticle DOS per vortex is appreciably H-dependent in the clean-limit superconductors,…
Magnetoresistance observed in pressed powder compacts of half-metallic ferromagnetic oxides is reviewed. The main, isotropic negative magnetoresistance, which exceeds 50% in CrO2 at low temperature, is due to alignment of the the ferromagnetic moments of contiguous ferromagnetic grains. The effect is related to interp…
Enhanced energy product and higher operating fields can be achieved by improving the squareness of the demagnetization loop. In isotropic materials, increasing loop squareness can be achieved by minimizing microstructural gradients and maximizing homogeneity. Achieving homogeneity by melt spinning can be difficult due…