FeNiSiO/SiO2 multi-layer granular magnetic films with high-resistivity

ArticleTransactions of the Materials Research Society of Japan. 34(1):9-13 (2009)journal articl

CoFeSiO/SiO(2) Multilayer Granular Films With Very Narrow Ferromagnetic Resonant Linewidth

In order to fabricate GHz-band micro-magnetic devices, we have investigated the high-frequency permeability of CoFeSiO/SiO multilayer granular films comprising alternate stacks of granular and insulator layers, which can enable us to control the magnetic grain size and intergrain spacing along the film thickness direction independent of each other. A very narrow ferromagnetic resonance (FMR) linewidth was obtained under specific film conditions. A sharp FMR peak was obtained for granular layer and insulator layer thicknesses of 6 and 1 nm, respectively. The CoFe/SiO(2) volume ratio of the granular layer has a strong influence on the FMR linewidth. A high CoFe/SiO(2) volume ratio resulted in a very narrow FMR linewidth. HR-TEM observation of a film with a high CoFe/SiO(2) volume ratio revealed a well-defined multilayer granular structure and a homogeneous CoFe grain size, which seem to be necessary for obtaining a very narrow FMR linewidth. The narrowest FMR linewidth observed in this study is 420 MHz, for an FMR frequency of 2.4 GHz, a permeability of 380, and a damping factor alpha of 0.007.ArticleIEEE TRANSACTIONS ON MAGNETICS. 45(10):4290-4293 (2009)journal articl

Spontaneous strain due to ferroquadrupolar ordering in UCu2_2Sn

The ternary uranium compound UCu$_2$Sn with a hexagonal ZrPt$_2$Al-type structure shows a phase transition at 16 K. We reported previously that huge lattice-softening is accompanied by the phase transition, which originates from ferroquadrupolar ordering of the ground state non-Kramers doublet $\Gamma_5$. A macroscopic strain, which is expected to emerge spontaneously, was not detected by powder X-ray diffraction in the temperature range between 4.2 and 300 K. To search the spontaneous strain, we have carried out thermal expansion measurements on a single-crystalline sample along the $a$, $b$ and $c$ axes using a capacitance technique with the resolution of $10^{-8}$. In the present experiment, we found the spontaneous $e_{xx} - e_{yy}$ strain which couples to the ground state doublet $\Gamma_5$. The effect of uniaxial pressure along the $a$, $b$ and $c$ axes on the transition temperature is also discussed.Comment: 4 pages, 5 figures, submitted to Phys. Rev.

Construcción de capacidades para la gestión de proyectos de desarrollo rural. Un enfoque desde las competencias

La efectiva gestión de proyectos de desarrollo rural en cualquier entorno depende de una gran variedad de factores y actitudes personales, propias de los actores que participan en el proceso de planificación, ejecución y evaluación, y que al final determinan el éxito y sostenibilidad de un proyecto. Este estudio fija su atención en el concepto ?construcción de capacidades? y su relación con el enfoque desde ?las competencias? en tres ámbitos (técnico, de comportamiento y contextual). En ese sentido, se hizo una revisión bibliográfica sobre el desarrollo de estos conceptos y se identificaron los principales instrumentos de medición existentes referidos a las capacidades y competencias adquiridas durante la implementación de un proyecto de desarrollo rural. Además, se propone el marco conceptual de un instrumento que pueda determinar las capacidades adquiridas bajo el marco de las competencias, con el fin de ser una herramienta que facilite la evaluación de proyectos de desarrollo rural y permita planificar una estrategia direccionada para la construcción de capacidades en los individuos

Clinical Course of Laryngeal Granuloma Without Surgical Treatment

Laryngeal granuloma is a rather common pathological entity, but its therapeutic strategy is still controversial. In general, therapeutic strategy consists of medications such as steroids or tranilast, in addition to vocal hygiene and surgery. Surgical removal is most commonly performed. However, it has recently been reported that recurrence after surgery is high

Insulin Resistance, Obesity, Hypertension, and Renal Sodium Transport

Sodium transport through various nephron segments is quite important in regulating sodium reabsorption and blood pressure. Among several regulators of this process, insulin acts on almost all the nephron segments and is a strong enhancer of sodium reabsorption. Sodium-proton exchanger type 3 (NHE3) is a main regulator of sodium reabsorption in the luminal side of proximal tubule. In the basolateral side of the proximal tubule, sodium-bicarbonate cotransporter (NBCe1) mediates sodium and bicarbonate exit from tubular cells. In the distal nephron and the connecting tubule, epithelial sodium channel (ENaC) is of great importance to sodium reabsorption. NHE3, NBCe1, and ENaC are all regulated by insulin. Recently with-no-lysine (WNK) kinases, responsible for familial hypertension, stimulating sodium reabsorption in the distal nephron, have been found to be also regulated by insulin. We will discuss the regulation of renal sodium transport by insulin and its roles in the pathogenesis of hypertension in insulin resistance

A Possibility of Magnetic Field Biasing Tunable Inductive Device Using a Hard Magnetic Film Magnetized by Pulsed-Magnetic Field

In this paper, the authors have proposed a possibility of a magnetic field biasing tunable inductive device. To confirm a new scheme, a tunable coplanar waveguide (CPW) resonator with a combination of soft magnetic thin film and hard magnetic film has been fabricated and evaluated. The magnetic pole of hard magnetic film can be controlled by magnetization using a pulsed magnetic field. A bias magnetic field is applied in the soft magnetic film from the magnetic pole of the hard magnet film. Consequently, permeability of the soft magnetic film can be controlled by changing amplitude of the pulsed magnetic field in the magnetizing for the hard magnetic film. A 20 mm long coplanar wave guide resonator has been fabricated using FeSiO/SiO2 granular multilayer film and FeCoSm amorphous hard magnetic film. From the experimental results, in case of using 0.2 mu m thick soft granular film, by changing amplitude of the 1 ms width current-pulse for magnetizing pulsed magnetic field for hard magnetic film, the maximum inductance change was up to 18%, and maximum change of the resonant frequency was 9.6%. The control energy for one time tuning was small enough (5.4 mu Wh).ArticleIEEE TRANSACTIONS ON MAGNETICS. 49(3):978-981 (2013)journal articl

A Possibility of Magnetic Field Biasing Tunable Inductive Device Using a Hard Magnetic Film Magnetized by Pulsed-Magnetic Field

In this paper, the authors have proposed a possibility of a magnetic field biasing tunable inductive device. To confirm a new scheme, a tunable coplanar waveguide (CPW) resonator with a combination of soft magnetic thin film and hard magnetic film has been fabricated and evaluated. The magnetic pole of hard magnetic film can be controlled by magnetization using a pulsed magnetic field. A bias magnetic field is applied in the soft magnetic film from the magnetic pole of the hard magnet film. Consequently, permeability of the soft magnetic film can be controlled by changing amplitude of the pulsed magnetic field in the magnetizing for the hard magnetic film. A 20 mm long coplanar wave guide resonator has been fabricated using FeSiO/SiO2 granular multilayer film and FeCoSm amorphous hard magnetic film. From the experimental results, in case of using 0.2 mu m thick soft granular film, by changing amplitude of the 1 ms width current-pulse for magnetizing pulsed magnetic field for hard magnetic film, the maximum inductance change was up to 18%, and maximum change of the resonant frequency was 9.6%. The control energy for one time tuning was small enough (5.4 mu Wh).ArticleIEEE TRANSACTIONS ON MAGNETICS. 49(3):978-981 (2013)journal articl

Anti-Inflammatory Effect on Colitis and Modulation of Microbiota by Fermented Plant Extract Supplementation

Although results of recent studies suggest that fermented foods strongly affect the gut microbiota composition and that they relieve inflammatory bowel disease symptoms, some reports have described that fermented foods increase some inflammation markers based on differences in fermented food materials. This study evaluated the effects of fermented plant extract (FPE) on dextran sulfate sodium (DSS)-induced colitis in mice and the effects on fecal microbiota composition in humans. Mice fed 5% FPE with 3% DSS (FPE group) showed no body weight loss, atrophy of colonic length, or bloody stool, similar to mice fed a basal diet (negative group), whereas mice fed 3% DSS (positive group) exhibited those effects. Concentrations of inflammation markers IL-6 and TNF-alpha were not significantly different between FPE and negative groups; however, those concentrations became higher in the positive group. 16S ribosomal RNA gene sequencing was used to characterize fecal microbiota in healthy women before and after 3-month FPE supplementation. The FPE supplementation induced increases in Firmicutes phyla and in Clostridiales order, which play a central role in inflammation suppression. These results suggest that FPE enhances Clostridiales growth in the gut and that it has an anti-inflammatory effect