Materials Literature
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In this work we have studied in detail the effect of MgO on magnetic properties and intergranular microstructure. We have found that both coercivity and thermal stability can be remarkably enhanced by the intergranular addition of MgO. For Nd22Fe71B7 magnets with 2 wt % MgO addition, the coercivity at room temperature…
Mossbauer effect studies (ME) for members of the alkylene-diammonium series, (CH2)n(NH3)2Fe(II)Cl4, where n=3, 4, 5, and 6 are presented. At 78 K the ME spectra reveal similar general features showing an 8 line well split hyperfine spectra; the effective magnetic field is in the range 18.5–20 T. Fitting the magnetizat…
Ceramic samples of composition (La1−xGdx)2/3Ca1/3MnO3 were prepared and used as targets to grow films onto LaAlO3 substrates by pulsed laser deposition. Comparison of the electrical resistance and thermopower, measured vs temperature and applied magnetic fields, indicates transport dominated by positively charged smal…
The cationic ring-opening polymerization of six-membered cyclic pseudoureas, 2-(1-pyrrolidinyl)- (2a) and 2-morpholino-5,6-dihydro-4H-1,3-oxazine (2b), was examined, which proceeded in two different ways, depending on the nature of initiator. The polymerization of 2 with methyl p-toluenesulfonate or trifluoromethanesu…
In this article the effects of dipolar and exchange interactions on the remanence ratio and coercivity in granular solids are examined using a generalized three-dimensional Monte Carlo model. This model allows the final configuration of magnetic moments to be calculated as a function of concentration, temperature and…
Using the interference of laser beams, we have fabricated the periodic arrays of submicron wires in Fe/C and Fe/Cr thin-film alloys. The array formation is found to arise from iron agglomeration in interference maxima. The dramatic decay of the in-plane magnetic anisotropy was observed in the fabricated arrays with de…
BaCoS 2 is a layered Mott–Hubbard insulator that orders antiferromagnetically near 300 K. We report magnetic susceptibility measurements on polycrystalline BaCoS2 from 77 to 800 K, and in- and out-of-plane measurements on single crystals from 2 to 350 K. We also report a powder neutron refinement of the magnetic struc…
Noise generated by a transformer core has been reduced by improving material and design, but further reduction is still required. To obtain the reduction, the comprehension of noise generating mechanism is important. It is achieved by detailed investigation of core vibration. A vibration measuring system utilizing a l…
This form of strontium germanium trioxide has the same structure as that reported by Hilmer [Sov. Phys. Crystallogr. (1963). 7(5), 573–576] except that it has monoclinic rather than hexagonal symmetry. Two forms of SrGeO3 are known at present: this monoclnic form and a triclinic form reported by Nadezhina, Pobedimskay…
The phase transformation and magnetic properties of nanocomposite (Nd0.95La0.05)9.5(Fe1−xCrx)81.5B9, where x=0, 0.033, 0.067, and 0.1, melt–spun ribbons have been studied. For Cr-free ribbons (i.e, x=0,) a slight substitution of La for Nd decreases the crystallization temperature of the over-quenched ribbons. Moreover…
The x-ray-photoemission spectra of the core levels and valence-band region of ${\mathrm{NiS}}_{2}$ is interpreted in terms of a cluster model in the impurity limit. The d-d and p-d charge-fluctuation parameters are evaluated and the nature of the lowest-lying ionization state is investigated.
Micromagnetic Barkhausen signals from magnetic materials originate from the discontinuous changes in magnetization under the action of a changing applied magnetic field. Barkhausen emissions that are detected by a sense coil come predominantly from a surface layer. In iron based materials this layer is about 500 μm th…
A dynamical model of interdomain "hinge bending" of T4 lysozyme in aqueous solution has been developed on the basis of molecular dynamics (MD) simulation. The MD model study provides a description of the conformational reorganization expected to occur for the protein in aqueous solution as compared to the crystalline…
Transmission loss characteristics of a fluorophosphate fiber was investigated in 200–800 nm wavelength region. The transmission loss was found to be primarily dominated by extrinsic absorption due to transition metal impurities. The total scattering is the next most important loss factor which is in fact Rayleigh in c…
We have investigated magnetoresistance (MR) phenomena relevant to the charge ordering (CO), namely, the real space ordering of both Mn3+ and Mn4+, in single crystals of (Nd1−ySmy)1/2Sr1/2MnO3, in which the one-electron bandwidth (W) is systematically controlled by varying the average ionic radius of the A site. The lo…
Mn–Al thin films with high coercivity and high saturation magnetization were successfully fabricated by rf magnetron sputtering with properly controlled chemical composition, substrate temperature, and annealing temperature. A high coercivity of about 3000 Oe and a saturation magnetization of about 420 emu/cc have bee…
Mullite formation was studied in andalusite bricks fired in the range 1300-1600°C Mullitization of andalusite grains retains the grain shape and bulk chemistry. An andalusite monocrystal is transformed into a composite made of a mullite monocrystal (≃ 80 %)with a capillary network filled with a silica rich glass. The…
The B-H hysteresis loop and Barkhausen noise have been measured in the neutron irradiated SA508 steel of 45 μm thickness. The coercive force of B-H loop showed a slow change up to a neutron dose of 1014 n/cm2 and increased by 15.4% for a 1016 n/cm2 dose sample compared with that of the unirradiated one, related to the…
The random phase approximation has been used to extend the Leibler theory for the stability limit of a homogeneous melt of A–B diblock copolymers to examine the onset of microphase and macrophase separation in a variety of ABC block copolymer systems. The stability limit is located by the divergence of the collective…
The activity of the c-Src protein tyrosine kinase is regulated by phosphorylation of a tyrosine residue (Tyr-527) in the C-terminal tail of the molecule. Phosphorylation of Tyr-527 promotes association of the tail with the SH2 domain and a concomitant reduction of the enzymatic activity of Src. We asked the question w…