Materials Literature
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This letter addresses the temperature dependence of some of the electrical properties of 0.2-μm-thick SrBi2Ta2O9 capacitors with platinum electrodes on silicon wafers for nonvolatile memory applications. Investigations of the remanent polarization, the nonvolatile polarization and the coercive field with pulse amplitu…
Spring magnets consist of a mixture of exchanged coupled, hard and soft magnetic phases and exhibit improved energy products and remanence. In this study, magnets containing a mixture of Nd2Fe14B and Fe3B have been fabricated using melt spinning under either Ar or He atmospheres. In addition, samples have been heat tr…
Ba-hexaferrite thin films for recording media applications are often fabricated by a two-step process: sputter deposition of an amorphous precursor, followed by annealing to crystallize the BaFe12O19 phase. The magnetic anisotropy of the crystalline films can be either in-plane or perpendicular, depending on the sputt…
Previously, nuclear magnetic resonance experiments and diffusion calculations have indicated that the distribution of nitrogen atoms in a Y2Fe17Nx particle with intermediate N content is characterized by a nitrided region and an unnitrided region. In order to directly detect this two-region configuration, x-ray diffra…
Calculation of the unstrained band offsets between conventional zinc-blende II-VI superlattices (ZnS/ZnSe/ZnTe), or between magnetic II-VI superlattices (MnS/MnSe/MnTe) or combinations thereof ($\frac{\mathrm{Mn}X}{\mathrm{Zn}X}$) show that (i) the range of offsets spanned by different magnetic II-VI superlattices is…
We study the stability range of coherent Ge quantum dots with an epitaxial Si shell. The critical radius is evaluated as a function of Si shell thickness and Ge nanocrystallite radius by comparing the energy of the system in the coherent and incoherent state. We find that the system is coherent up to a Ge nanocrystall…
We report a spin analysis of core-level photoelectrons excited by circularly polarized x rays from a non-magnetic solid. In a combined experimental and theoretical study, we show that the spin-orbit-split W $4{f}_{\frac{7}{2}}$ and $4{f}_{\frac{5}{2}}$ photoemission lines from W(110) exhibit high spin polarizations of…
The magnetic properties of the ferromagnetic compounds, SmFe11Ti and SmFe11TiH1−δ, which are potential candidates for high performance permanent magnets are investigated. At room temperature both compounds exhibit a uniaxial anisotropy, with the easy direction of magnetization parallel to the tetragonal axis. High fie…
For high sensitivity magnetoresistive (MR) transducers, the role of interstrip gap is examined as a design parameter. This is modeled using analytic and numerical approximations. As the gap is narrowed the range of linearity of the MR transducer decreases and the sensitivity increases. For gap/width ratio exceeding 1.…
Coercivity optimization studies were done on melt-spun nanocomposite Nd4R2Fe87−xNbTxB6 (R=Nd,Y,Dy; T=Ag,Cu) isotropic ribbon samples. The maximum attainable coercivities, after adjusting the annealing time, were found to be very sensitive to the annealing temperatures. The optimum magnetic properties [HC=3.9 kOe, (BH)…
The nested carbon nanotubes discovered by Ijima and co-workers as a by-product of fullerene production extended the dimension and geometries of fullerenes into the domain of nanoparticles. These nanotubes are fiberlike structures consisting of concentric graphite sheets nested along the axis extending as long as sever…
The mechanism of magnetostriction in transition metal bulk (fcc Co) and thin films [Co/Pd(001) and Co/Cu(001)] is investigated using the ab initio full potential linearized augmented plane wave method. With the aid of the state tracking and torque approaches the magnetocrystalline anisotropy energy, the essential ingr…
Texture development in 3% Si steel sheets by the manganese removal and decarburization process has been investigated. The 3% Si steel sheets that contain Mn and C were first annealed in vacuum at α-ferrite (α)/austenite (γ) duplex or γ phase temperatures, and then decarburized. During the vacuum annealing a manganese…
Single-crystal Ni(dmit${)}_{2}$ salts, (${\mathrm{Ph}}_{4}$P)[Ni(dmit${)}_{2}$${]}_{3}$, (${\mathrm{Bu}}_{4}$N${)}_{2}$[Ni(dmit${)}_{2}$${]}_{7}$\ensuremath{\cdot}${2\mathrm{C}\mathrm{H}}_{3}$CN, and (${\mathrm{Me}}_{3}$S)[Ni(dmit${)}_{2}$${]}_{2}$, have been synthesized. All show semiconducting behavior in their temp…
We have investigated the sensitivity of structural, magnetic, and magnetocaloric properties of (Hf0.83Ta0.17)Fe2+x alloys (x=−0.18, −0.09, −0.02, 0.00, 0.09, 0.26) to Fe content. As-cast samples for all x consist essentially exclusively of hexagonal MgZn2-type material. Via magnetization and differential scanning calo…
Sulfone-containing polyesters of 18 kinds having inherent viscosities of 1.19–0.16 dL g−1 were prepared derived from 4,4′-sulfonyl dibenzoyl chloride by solution polycondensation from various aromatic and aliphatic diols in nitrobenzene at 82°C. The polyesters were examined with IR spectra, inherent viscosity, x-ray d…
Low pressure inductively coupled plasma enhanced chemical vapor deposition (ICP–CVD) made it possible to deposit stoichiometric boron nitride (BN) films with thickness gradients in lateral direction, which clearly demonstrate the progresses of the cubic BN (c-BN) growth. Under optimal deposition conditions, single-pha…
The results of an extended investigation of the monoclinic (M2)–monoclinic (M3) phase transition in the mixed AgNbxTa1−xO3 system (ATN) with high concentration of niobium (Nb) are presented in this paper. ATN’s dielectric properties make it promising for microwave technologies and stimulate investigations of the niobi…
The process of bias enhanced nucleation of microwave chemical vapor deposited diamond on silicon has been extensively characterized using plasma diagnostics, scanning and transmission electron microscopy (TEM), Raman spectroscopy, and x-ray diffraction. The nucleation kinetics were measured as a function of bias volta…
An investigation was conducted comparing the corrosion behavior of NdFeB magnets in flowing hydrogen and in the heat and humidity of an autoclave. The results show that corrosion is both macroscopically and microscopically similar in both environments. In both cases, the corrosion progressed most rapidly in those area…