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Your search keyword '"Itoh, M."' showing total 283 results
283 results on '"Itoh, M."'

1. Microstructure and field angle dependence of critical current densities in REBa/sub 2/Cu/sub 3/O/sub y/ thin films prepared by PLD method

Author

Ichino, Y., Honda, R., Miura, M., Itoh, M., Yoshida, Y., Takai, Y., Matsumoto, K., Mukaida, M., and Ichinose, A.

Subjects
thin film, REBa2Cu3O, magnetic field, Critical current density
Abstract

A-axis oriented epitaxial REBa2Cu3Oy (RE123) thin film performs excellent superconducting properties in magnetic field. Recently, we reported that a critical current density (Jc) in the RE123 thin film was improved by a deliberate composition control. A Sm1+x Ba2-xCu3Oy (Sm123) thin film with a small amount of Sm/Ba substitution x showed the great Jc ～ 0.17 MA cm2 in 5 T at 77.3 K, while the Jc in (Yb1 Nd )Ba2Cu3Oy (Yb/Nd123) thin films depended on an amount of mixed crystal ratio . In this report, we studied Jc as a function of magnetic field and field orientation with respect to ab-planes. In low magnetic field, the Jc of Sm123 thin film was almost independent of the applied angle of the field. In the case of Yb/Nd123 thin film, extremely high Jc were observed when the magnetic field was aligned parallel or perpendicular to the surface of the film. Because compositional fluctuations in RE123 thin films were observed by transmission electron microscopy, we found that the pinning centers in RE123 thin films are strongly affected by the composition in the thin films.

Published
2005

2. M $\times$ N Wavelength Selective Switches Using Beam Splitting By Space Light Modulators.

Author

Yamaguchi, K., Ikuma, Y., Nakajima, M., Suzuki, K., Itoh, M., and Hashimoto, T.

Abstract

We propose a multiple-input-multiple-output (M $\times$ N) optical switch with the same optical system as that used for a single-input-multiple-output (1 $\times$ N) switch based on a liquid crystal on silicon (LCOS). The proposed M $\times$ N switch can route multiple signals simultaneously from different plural inputs to plural outputs, which is called multipole multithrow (MPMT). In addition, our switch configuration can multiply an MPMT switch due to its multicast capacity by beam splitting with holographic phase modulation on the LCOS. We demonstrate a two-degree ROADM using our proposed 4 $\times$ 4 wavelength selective switch. The experimental results show that a two-degree ROADM node can be realized by using this switch. The increase in the insertion loss caused by the MPMT switching function is 3 dB due to beam splitting and 3–4.1 dB due to imperfections in the holographic phase modulations. The maximum port crosstalk (XT) is −20.0 dB. [ABSTRACT FROM PUBLISHER]

Published
2016
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5. Development of radiation sensor based on Pt/ZnO Schottky diode.

Author

Narita, S., Nishibori, Y., Naito, H., Ito, H., Endo, H., Chiba, T., Sakemi, Y., Itoh, M., and Yoshida, H.

Abstract

We have fabricated the Pt/ZnO Schottky diode based on the single crystal substrate grown by the hydrothermal growth method. The output signals from the diode were analyzed for the incidence of x-rays and α-rays, and the clear responses for those radiations were observed. We have demonstrated a potential of the ZnO based device for ionizing radiations. In addition, we investigated the radiation hardness of the ZnO material irradiating the diode sample with the high energy proton beam. The electrical characteristics have not been significantly changed even after irradiation of 1015 protons/cm2. [ABSTRACT FROM PUBLISHER]

Published
2011
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