71 Result(s)
within
H Tanaka
Characterization and Evaluation of Materials
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Article
Effective Improvement of Pt Catalyst for Exhaust Gas Purification by Using the Highly Crystallized CeO2 as an Additive
Over the last few decades, Pd-based three-way catalysts (TWCs) have been more extensively used than Pt-based TWCs because of their higher thermal stability. In this study, the addition of CeO2 to a Pt-based TWC w...
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Article
Sintering Characteristics of Thermal Barrier YSZ Coatings Made by Suspension Plasma Spraying
Thermal barrier coatings (TBCs) deposited by suspension plasma spraying (SPS) are recognized as a potent method to increase efficiency and extend the life of gas turbines. The unique microstructure of the SPS ...
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Article
Studies of Ni and Co Doped Amorphous AlN for Magneto-Optical Applications
Magneto-optical properties of Ni- and Co-doped amorphous AlN thin films were investigated as a function of post grown annealing temperature using magneto-optical Kerr effect (MOKE) spectroscopy. The x-ray diff...
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Article
Zeeman Splitting of Ferromagnetic GaMnAs on InP Observed by Magnetic Circular Dichroism in Reflection Mode
Systematic investigations of Ga1−x Mn x As grown on InP with different Mn concentrations have been conducted using magnetic circular dichroism (MCD) in re...
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Article
Evaluation of optical amplification properties using dressed photons in a silicon waveguide
We fabricated an optical waveguide having a high optical confinement effect using a silicon-on-insulator substrate, and we eliminated the difficulty involved with optical alignment for making laser light pass...
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Article
Cluster and Thickness Dependence of Ferromagnetism in Nickel In Situ-Doped Amorphous AlN Thin Films
We report on magneto-optical investigations of Ni-doped amorphous AlN (a-AlN) thin films. The a-AlN was grown by radiofrequency (rf) sputtering on Si (0001) substrates at low temperature and doped with Ni at ...
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Article
Correlation between Filament Distribution and Resistive Switching Property in Binary-Transition-Metal-Oxide Based Resistive Random Access Memory.
Large variation in basic memory properties is a serious issue that hinders the practical use of ReRAM. This study revealed that one of the main factors causing variation is the presence of multiple filaments w...
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Article
Morphology and Magneto-optical Properties of Amorphous AlN Films Doped with Nickel
Structural and magneto-optical properties of Ni-doped amorphous AlN layers (a-AlN) deposited by radio frequency (rf) sputtering on Silicon (001) substrates were investigated. The as-grown material exhibits weak f...
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Article
Synthesis of PbS Semiconductor Microcrystallites In Situ in Reverse Micelles
Colloid semiconductor particles of PbS have been prepared in reversed micelles of AOT-heptane. The effects of the AOT, water and reactants concentrations have been studied. The initial crystallite size and its...
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Article
Observation of Elementary Excitations of Quantum Sine-Gordon Spin System KCuGaF6 Under High Magnetic Field
In magnetic field, KCuGaF6 can be mapped onto the quantum sine-Gordon model, for which low-energy elementary excitations are solitons, antisolitons and their bound states breathers. Using high-frequency, high-fie...
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Article
Development of a real-time stereo TEM
We have developed a real-time stereo transmission electron microscope (TEM) with tilting illumination. This system allows us to observe three-dimensional (3-D) images directly with a video-rate of 1/30 s. The ...
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Article
Ground-State Triplet Biradicals of Nitronyl Nitroxide Containing a Nucleobase Substituent as Synthons for Bio-Inspired Organic Magnets
An organic nitronyl nitroxide biradical substituted with a nucleobase of cytosine was designed and synthesized. The molecular ground state of the biradical was found to be triplet (S = 1) with a singlet-triplet e...
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Article
Observation of Antiferromagnetic Spin-Flop Transition in λ-type BETS Salts Using AFM Microcantilever
Antiferromagnetic spin-flop transitions in a series of λ- (BETS)2FeBr x Cl4-x are observed using piezoresistive AFM microcantilever. The measurements are...
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Article
π-d Interaction in the Field Induced Superconductor λ-(BETS)2FeCl4: Studied by 77Se NMR
77Se NMR measurements have been performed in the normal state of the organic, magnetic field induced Superconductor λ(BETS)2FeCl4, to examine the interaction between Fe local spins and π ...
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Article
Ground-state triplet biradicals of nitronyl nitroxide containing a nucleobase substituent as synthons for bio-inspired organic magnets
An organic nitronyl nitroxide biradical substituted with a nucleobase of cytosine was designed and synthesized. The molecular ground state of the biradical was found to be triplet (S=1) with a singlet-triplet ...
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Article
π-d interaction in the field induced superconductor λ-(BETS)2FeCl4: Studied by77Se NMR
77Se NMR measurements have been performed in the normal state of the organic, magnetic field induced superconductor λ(BETS)2FeCl4, to examine the interaction between Fe local spins and π conducti...
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Article
Observation of antiferromagnetic spin-flop transition in λ-type BETS salts using AFM microcantilever
Antiferromagnetic spin-flop transitions in a series of λ-(BETS)2FeBrxCl4-x are observed using piezoresistive AFM microcantilever. The measurements are carried out on a tiny single crystal using a sample rotator a...
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Article
Diameter determination of C60 and C70 monomers in the gas phase using a differential mobility analyzer
C60 and C70 monomers were produced by sublimation of fullerene powder under low-pressure conditions, and their electrical mobilities were measured using a differential mobility analyzer. Apparent particle diamete...
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Article
Development of a target for laser-produced plasma EUV light source using Sn nano-particles
Nano-structured and tin-based targets have been fabricated by the pulsed-laser ablation method, in order to develop efficient and debris-free targets for the laser-produced plasma extreme ultraviolet (EUV) lig...
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Article
Formation process of Na-X zeolites from coal fly ash
In order to synthesize Na-X zeolite from coal fly ash (Fa), Fa was pretreated under stirring condition at various temperatures of 20–50°C for 72 h and then aged at 85°C for a given period with NaOH solutions. ...
