Materials Literature
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In a paper submitted to the Arxive some time ago (cond-mat/0509270), R. S. Fishman et al. considered double-exchange model on a Bethe lattice in infinite dimensions using dynamical mean-field theory. We present a somewhat different derivation of their general formula for the magnetic disorder - order transition temper…
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The decomposition behaviors of melt-spun amorphous Fe82−xNdxB18 (x=3-5.5) and Fe82−zNd5B18Mz (M=Ti, V, and Cr; z=1.5-5) alloys under a range of heating rates (0.042 to 8.3K∕s) have been investigated. The heating rate upon nanocrystallization has little effect on the structural and magnetic properties in both Fe79Nd3B1…
Strip-casting technique is used to prepare anisotropic Nd(Fe,Mo)12Nx compounds. It is found that, by this technique, the single-phase Nd(Fe,Mo)12 compounds can be directly obtained without postannealing at a rolling velocity of 3m∕s and with an Fe-to-Mo ratio of 7. Under the same nitrogenation conditions, it is easier…
The theoretical approach proposed here was aimed at accurately describing the electromagnetic response of self-biased Y-junction circulators made of polycrystalline hexaferrites. The accuracy of circulator response was enhanced by considering the real magnetization state of the material through a calculation of the pe…
The behavior of the film precursors, Pr(DPM)3,Ca(DPM)2, and Mn(DPM)3, in the gas phase was investigated under actual chemical vapor deposition conditions of Pr1−xCaxMnO3. According to in situ infrared absorption spectroscopy, Pr(DPM)3 is much more stable against thermal decomposition than Ca(DPM)2. The atomic composit…
The phase transformation-induced coercivity mechanism in SmCo5±x sintered magnets is proposed based on the phase transformations according to the hypothetic Sm–Co phase diagram. The phase transformations are supposed to modify the surface of principal phase grains. The precipitation of the SmCo5−x phases in Sm-rich ma…
This work investigated microstructure in the surface-melted region of Ni-base single crystal superalloy CMSX-4 by using a diode laser beam as a heating source. Such processing parameters as laser power and scanning speed in laser surface melting were varied while defocusing distance and shielding gas (Ar) flow rates w…
We report on the fabrication and characterization of magnetic tunnel junctions using the Heusler compound Co2MnGe as the bottom electrode and Co as counter electrode. The Co2MnGe phase in the cubic L21 structure belongs to the group of Heusler alloys with theoretically predicted full spin polarization at the Fermi lev…
The influences of constituents on magnetic properties, thermal stabilities, and magnetizing abilities have been investigated for hybrid bonded magnets containing Nd–Fe–B/ferrite or two distinctly different Nd–Fe–B materials. The experiments indicated that the Br of the hybrid Nd–Fe–B/ferrite magnets increases nonlinea…
Well-crystallized Ni–Zn ferrite (Ni0.4Zn0.6Fe2O4) highly oriented ultrathin films were obtained at a substrate temperature of 200 °C by a reactive sputtering method utilizing electron cyclotron resonance microwave plasma, which is very effective to crystallize oxide or nitride materials without heat treatment. Thin fi…
A local study of the influence of annealing temperature that can provoke structural defects and chemical disorder on the magnetism of Heusler alloys has been carried out by measuring hyperfine interactions in Pd2MnZ (Z=Ge, In, Sn, and Sb). Perturbed angular correlation method has been used to measure the hyperfine fie…
Sr 2 Fe Mo O 6 ( 70 nm ) ∕ Sr Ti O 3 ( 3 nm ) ∕ Co Fe 2 O 4 ( 30 nm ) magnetic tunnel junctions are grown by pulsed laser deposition and patterned using optical lithography. The square tunnel elements with lateral size of 50μm exhibit nonlinear zero-field current-voltage (I-V) variation. More interesting, when the tem…
Powders of polymer and α-Fe2O3 nanoparticles were pressed into pellets. The samples were annealed at 250°C in pure hydrogen flow. X-ray diffraction spectra indicate that there is a complete phase transformation from α-Fe2O3 to Fe3O4. Giant negative magnetoresistance (MR) was observed at room temperature and the MR rat…
The magnetic and electric properties of ferrites are influenced by the cation distribution within the crystalline spinel lattice. Methods such as extended x-ray-absorption fine structure (EXAFS) have been used to determine cation occupancies within the crystalline structure of materials such as manganese zinc ferrite…
A self-consistent atomistic simulation method is established to investigate carbon nanotubes (CNTs) as the charge sensing channels in nonvolatile memory and sensor applications. The theoretical simulation agrees with the experimental results, demonstrating that the sensor can achieve a high sensitivity down to a singl…
A new substituted tetra-(4-octanethiol-5-nitro)phthalocyaninatocopper complex was synthesized by nucleophlic substitution of tetra-(4-bromo-5-nitro)phthalocyaninatocopper where the bromo activated by an ortho-nitro group is easily substituted by 1-octanethiol.
Dy 1 − x Pr x ( Fe 0.35 Co 0.55 B 0.1 ) 2 (0⩽x⩽1) Laves compounds with a cubic MgCu2-type structure were synthesized by arc melting and subsequent annealing. The lattice parameter of the Laves compounds linearly increases, while the Curie temperature TC decreases with increasing Pr content. The saturation magnetizatio…
We report on the properties of ultrathin (2, 4, 6, and 8nm) epitaxial films of magnetite, Fe3O4, grown on MgO (100). Atomic force microscopy image and V-I curves suggest that the films at this thickness are still continuous. The resistivity versus temperature results imply that the conductivity mechanism in all these…
The spontaneous generation of voltage (SGV) in single-crystal and polycrystalline Gd5Si2Ge2 during the coupled magnetostructural transformation has been examined. Our experiments show reversible, measurable, and repeatable SGV responses of the materials to the temperature and magnetic field. The parameters of the resp…