Materials Literature
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The influence of pressure on the itinerant electron metamagnetic (IEM) transition has been investigated for a La(FexSi1−x)13 compound. The critical temperature T0 defined as the disappearance point of the IEM transition decreases with increasing hydrostatic pressure. Since the pressure dependence of T0 is smaller than…
The present study reports on several in vivo biological tests carried out with a cobalt–ferrite, citrate-coated, magnetic fluid sample developed for biomedical purposes. Systematic biological investigation was performed after endovenous injection in mice. Morphological analysis showed magnetic nanoparticle (MNP) infil…
Research on manganese zinc ferrites (MZFO) has undergone a renewal in recent years as advances in synthetic techniques promise smaller grain sizes and corresponding changes in material properties. Current techniques for nanoscale synthesis of ferrites, however, produce a broad distribution of particle sizes, thus limi…
We have investigated effects of the partial substitution of trivalent La for divalent Ba on the magnetic properties of the double perovskite Ba2FeMoO6. Polycrystalline Ba2−xLaxFeMoO6 samples have been prepared by the conventional solid-state reaction in a stream of 5% H2/Ar gas. Magnetization (15 K, 5 kOe) is 2.6μB/f.…
Microdomain structures of ABC 3-miktoarm star terpolymers in three-dimensional space were investigated by dynamic density functional theory (DDFT). Analysis of DDFT demonstrates that the junction points are restricted to lie on the periodically spaced parallel lines formed by the mutual intersections of different doma…
The paramagnetic electron-spin resonance (ESR) linewidth of polycrystalline Nd1−xSrxMnO3 (x=0.3, 0.33, 0.4, and 0.5) increases in a quasilinear manner up to 400 K due to the formation of paramagnetic clusters, which is also confirmed by the observation of an activated behavior of the ESR intensity above TC. Upon cooli…
Polycrystalline Zn2U (Ba4Zn2Fe36O60) was synthesized. The high-energy milling of the starting powders activated the synthesis of the Zn2U at 1100 °C. Energy dispersive spectroscopy supported by x-ray diffraction analysis confirmed that pure Zn2U was synthesized in the temperature range 1200–1300 °C. The magnetic prope…
Oscillatory acceleration and deceleration of a column of water leads to a pipe hammer as well as cavitation. With a small amount of xenon gas dissolved in the water, we can detect a stream of predominantly ultraviolet subnanosecond flashes of light which are attributed to collapsing bubbles. The observed emission can…
The magnetic properties of Mn- and Eu-doped ZnS nanocrystals have been investigated. The results suggest that most of the Mn ions are coordinated on the surface of the nanocrystal, and the amount of Mn doped inside the nanocrystal does not exceed one per nanocrystal. Low-temperature magnetization shows the absence of…
K 2 CO 3 -promoted polycondensations of phloroglucinol and 4,4‘-difluorodiphenyl sulfone (DFDPS) in DMSO yielded mixtures of linear oligomers due to numerous side reactions. In contrast, polycondensations of silylated phloroglucinol under similar conditions were not plagued by such side reactions but involved various…
We report the growth of thick barium hexaferrite (BaFe12O19,BaM) films on m-planes ([11_00] or [101_0]) sapphire (Al2O3) substrates by the liquid phase epitaxy deposition technique. The procedure entailed the deposition of seed layers of BaFe12O19 onto the substrate by the pulsed laser ablation deposition and then dip…
We report on the fabrication of terminating-layer-controlled La0.6Sr0.4MnO3 (LSMO) thin films and in situ characterization of the films using photoemission spectroscopy. The terminating layer of the LSMO films was changed from B to A site by inserting one atomic layer of SrO between the LSMO film and a TiO2-terminated…
The temperature dependence of the spin polarization of half-metallic ferromagnets is investigated. A unitary spinor transformation shows that the corresponding spin mixing goes beyond finite-temperature smearing of the Fermi level, leading to a nonzero density of states in the gap of the insulating spin channel. As a…
High-quality epitaxial thin films of Co-doped anatase TiO2 (Co:TiO2) were grown epitaxially on SrTiO3 (001) substrates by using pulsed laser deposition with in-situ reflection high-energy electron diffraction. The oxygen partial pressure, PO2, during the growth was systematically varied. As PO2 decreased, the growth b…
Magnetic properties of IV–VI compound GeTe based diluted magnetic semiconductors with 3d transition metals from Ti to Ni have been investigated. Ferromagnetic order is observed for the Cr, Mn, and Fe doped GeTe films, whereas the Ti, V, Co, and Ni doped films are paramagnetic. The ferromagnetic order could give rise t…
Although the 3ω method was originally introduced to measure the thermal conductivity of bulk material and was later developed further to include thin-film materials, many thermal and geometrical parameters influence the 3ω signal. We show that several of these parameters can be determined simultaneously from a single…
Sm–Co nanoparticles with 7 nm mean diameter have been obtained by gas condensation in a cluster gun. By absorbing light from quartz halogen bulbs, the nanoparticles are annealed during their flight from the cluster gun to the substrate and are embedded in a carbon matrix by cosputtering. This in situ annealing results…
We report preliminary high-frequency electron paramagnetic resonance (EPR) investigations for several tetranuclear nickel complexes which exhibit single-molecule magnetism, including low-temperature (below ∼1 K) hysteresis loops and resonant magnetic quantum tunneling. The combination of a cavity perturbation techniqu…
The effect of mechanical milling on the luminescence properties of ZnO microcrystalline samples has been studied by means of cathodoluminescence in a scanning electron microscope. The samples consisted of pressed pellets of commercially available ZnO powder which were ball milled to investigate the possibility of nano…
Ni–Zn–Co ferrite films were deposited by the spin-spray ferrite plating from an aqueous solution. Film with optimized Zn and Co contents (i.e., Ni0.22Zn0.52Co0.03Fe2.23O4) exhibited the real permeability μr′ higher than 260 at frequencies up to 130 MHz, and the imaginary permeability μr″ higher than 100 in the extreme…