R. William McCallum

Multifunctional Properties of Cyanate Ester Composites with SiO2 Coated Fe3O4 Fillers

SiO2 coated Fe3O4 submicrometer spherical particles (a conducting core/insulating shell configuration) are fabricated using a hydrothermal method and are loaded at 10 and 20 vol % into a bisphenol E cyanate ester matrix for synthesis of multifunctional composites. The dielectric constant of the resulting composites is found to be enhanced over a wide frequency and temperature range while the low dielectric loss tangent of the neat cyanate ester polymer is largely preserved up to 160 °C due to the insulating SiO2 coating on individual conductive Fe3O4 submicrometer spheres. These composites also demonstrate high dielectric breakdown strengths at room temperature. Dynamic mechanical analysis indicates that the storage modulus of the composite with a 20 vol % filler loading is twice as high as that of neat resin, but the glass transition temperature considerably decreases with increasing filler content. Magnetic measurements reveal a large saturation magnetization and negligibly low coercivity and remanent magnetization in these composites.

Tweaking the spin-wave dispersion and suppressing the incommensurate phase in LiNiPO4 by iron substitution

Elastic and inelastic neutron scattering studies of Li(Ni

(Pr,Nd)–Fe–B nanocrystalline magnetic materials with TiC additions

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Negative Expansion Of Eu(Ba1−xLax)2Cu3O7−d Compounds

Fe

Method of making permanent magnets

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Carbide/nitride grain refined rare earth-iron-boron permanent magnet and method of making

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Method of making bonded or sintered permanent magnets

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Determination of the saturation magnetization, anisotropy field, mean field interaction, and switching field distribution for nanocrystalline hard magnets

single crystals reveal anomalous spin-wave dispersions along the crystallographic direction parallel to the characteristic wave vector of the magnetic incommensurate phase. The anomalous spin-wave dispersion ({\it magnetic soft mode}) indicates the instability of the Ising-like ground state that eventually evolves into the incommensurate phase as the temperature is raised. The pure LiNiPO

Method of making quasicrystal alloy powder, protective coatings and articles

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The requirements for hysteresis in the recoil loop of an exchange-coupled permanent magnet

system (