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Dive into the research topics where Y. Matsumoto is active.

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Featured researches published by Y. Matsumoto.


Applied Surface Science | 2004

Development of a new combinatorial mask for addressable ternary phase diagramming: application to rare earth doped phosphors

R. Takahashi; H. Kubota; T. Tanigawa; Makoto Murakami; Yukio Yamamoto; Y. Matsumoto; Hideomi Koinuma

Abstract We report on the computer-aided design of a novel mask for the addressable ternary phase diagram to serve a quick screening of multi-component functional materials. Masking patterns were optimized to make a triangular ternary diagram with each composition changed from 0 to 100% by simulating the deposition process under the condition of synchronous control of the mask motion, target exchange, and laser pulses. Fabrication of a ternary M0.01Y1.99O3 (M=Eu, Tm, Tb) phosphor material demonstrates of the direct mapping relationship between the film composition and its cathode luminescence (CL) property.


Measurement Science and Technology | 2005

Computer design of combinatorial shadow mask for ternary composition spread library

R. Takahashi; Y. Matsumoto; Hideomi Koinuma

A simple rotational shadow masking system has been designed by computer simulation for application to the fabrication of a ternary composition spread material library. A mask plate is stencilled off a right triangle pattern and a trapezoid pattern. This can define the thickness gradient of films deposited from three different sources along the axes between the tops and the mid-points of bottom lines of a triangle on a substrate surface. Optimizing the angles of the triangle and trapezoid patterns and regulating the rates of mask moving, the computer simulation predicts that the film thickness of each component varies linearly from one mono-layer at the top to zero at the bottom. This process enables the construction of a ternary phase diagram by repeating the film deposition sequence. This prediction has been mathematically derived in this study.


MRS Proceedings | 2003

High-Throughput Screening of Flux Materials for Single Crystal Growth by Combinatorial Pulsed Laser Deposition

R. Takahashi; T. Tanigawa; Yukio Yamamoto; Yoshiyuki Yonezawa; Y. Matsumoto; Hideomi Koinuma

We propose a new concept and method for high throughput screening of flux materials used in the bulk single crystal growth. The concept of our tri-phase epitaxy has been generalized as the flux-mediated epitaxy with the aid of quick optimization of flux materials in the combinatorial thin-film technology. Here, we report on the successful discovery of a new flux composition of Bi-Ti-Cu-O for the growth of high-quality Bi 4 Ti 3 O 12 bulk crystal and thin film.


Journal of Physical Chemistry B | 2005

Crystal-Face Dependences of Surface Band Edges and Hole Reactivity, Revealed by Preparation of Essentially Atomically Smooth and Stable (110) and (100) n-TiO2 (Rutile) Surfaces

Ryuhei Nakamura; Naomichi Ohashi; Akihito Imanishi; Takeo Osawa; Y. Matsumoto; Hideomi Koinuma; Yoshihiro Nakato


ACS Combinatorial Science | 2004

Design of combinatorial shadow masks for complete ternary-phase diagramming of solid state materials.

R. Takahashi; H. Kubota; Makoto Murakami; Yukio Yamamoto; Y. Matsumoto; Hideomi Koinuma


Applied Surface Science | 2004

Homo-epitaxial growth of rutile TiO2 film on step and terrace structured substrate

Yuichi Yamamoto; Y. Matsumoto; Hideomi Koinuma


Mrs Bulletin | 2003

Combinatorial investigation of spintronic materials

Y. Matsumoto; Hideomi Koinuma; Tetsuya Hasegawa; Ichiro Takeuchi; Frank Tsui; Young K. Yoo


Advanced Functional Materials | 2006

Perfect Bi4Ti3O12 Single‐Crystal Films via Flux‐Mediated Epitaxy

R. Takahashi; Yoshiyuki Yonezawa; Makoto Ohtani; Masashi Kawasaki; Kiyomi Nakajima; Toyohiro Chikyow; Hideomi Koinuma; Y. Matsumoto


Applied Surface Science | 2004

Mathematical design of linear action masks for binary and ternary composition spread film library

Yukio Yamamoto; R. Takahashi; Y. Matsumoto; Toyohiro Chikyow; Hideomi Koinuma


Applied Surface Science | 2004

Combinatorial fabrication and characterization of ferromagnetic Ti–Co–O system

Makoto Murakami; Y. Matsumoto; M. Nagano; Tetsuya Hasegawa; Masashi Kawasaki; Hideomi Koinuma

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R. Takahashi

Tokyo Institute of Technology

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Toyohiro Chikyow

National Institute for Materials Science

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H. Kubota

Tokyo Institute of Technology

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Masato Kakihana

Tokyo Institute of Technology

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