Faculty Profiles - SAITOH, Koh

Papers - SAITOH, Koh

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Superconductivity in High-Entropy Antimonide M1-x Pt x Sb (M = Equimolar Ru, Rh, Pd, and Ir)

Hirai Daigorou, Uematsu Naoto, Saitoh Koh, Katayama Naoyuki, Takenaka Koshi

INORGANIC CHEMISTRY Vol. 62 ( 35 ) page： 14207 - 14215 2023.8

Measurement and correction of TEM image distortion using arbitrary samples

Tamaki Hirokazu, Saitoh Koh

MICROSCOPY 2023.2

Orbital angular momentum-resolved convergent-beam electron diffraction by the post-selected injection of electron beam

Saitoh Koh, Yonezawa Tatsuya, Nambu Hiroki, Tanimura Shogo, Uchida Masaya

MICROSCOPY Vol. 71 ( 6 ) page： 374 - 379 2022.12

Extension of focal depth by electron quasi-Bessel beam in atomic-resolution scanning transmission electron microscopy

Ishida Takafumi, Owaki Takeshi, Ohtsuka Masahiro, Kuwahara Makoto, Saitoh Koh, Kawasaki Tadahiro

APPLIED PHYSICS EXPRESS Vol. 15 ( 11 ) 2022.11

Transient electron energy-loss spectroscopy of optically stimulated gold nanoparticles using picosecond pulsed electron beam

Kuwahara Makoto, Mizuno Lira, Yokoi Rina, Morishita Hideo, Ishida Takafumi, Saitoh Koh, Tanaka Nobuo, Kuwahara Shota, Agemura Toshihide

APPLIED PHYSICS LETTERS Vol. 121 ( 14 ) 2022.10

Compressed Sensing in Transmission Electron Microscopy

Nomura Yuki, Anada Satoshi, Yamamoto Kazuo, Hirayama Tsukasa, Saitoh Koh

KENBIKYO Vol. 56 ( 3 ) page： 116 - 123 2021.12

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Microscopy

The key of compressed sensing technology is to find out the feature elements (bases) contained in the original signal from few sampled measurements. In this paper, we introduce theories of compressed sensing techniques based on machine learning and their application to scanning transmission electron microscopy, electron energy loss spectroscopy, and electron holography, in which the bases are extracted by suitable statistical signal processing (sparse coding and tensor decomposition).

DOI： 10.11410/kenbikyo.56.3_116

CiNii Research

Observation of domain wall bimerons in chiral magnets

Nagase Tomoki, So Yeong-Gi, Yasui Hayata, Ishida Takafumi, Yoshida Hiroyuki K., Tanaka Yukio, Saitoh Koh, Ikarashi Nobuyuki, Kawaguchi Yuki, Kuwahara Makoto, Nagao Masahiro

NATURE COMMUNICATIONS Vol. 12 ( 1 ) 2021.6

Denoising of series electron holograms using tensor decomposition

Nomura Yuki, Yamamoto Kazuo, Anada Satoshi, Hirayama Tsukasa, Igaki Emiko, Saitoh Koh

MICROSCOPY Vol. 70 ( 3 ) page： 255 - 264 2021.6

Performance of a silicon-on-insulator direct electron detector in a low-voltage transmission electron microscope

Ishida Takafumi, Shinozaki Akira, Kuwahara Makoto, Miyoshi Toshinobu, Saitoh Koh, Arai Yasuo

MICROSCOPY Vol. 70 ( 3 ) page： 321 - 325 2021.6

Intensity Interference in a Coherent Spin-Polarized Electron Beam

Kuwahara Makoto, Yoshida Yuya, Nagata Wataru, Nakakura Kojiro, Furui Masato, Ishida Takafumi, Saitoh Koh, Ujihara Toru, Tanaka Nobuo

PHYSICAL REVIEW LETTERS Vol. 126 ( 12 ) 2021.3

Slow dynamics of disordered zigzag chain molecules in layered LiVS2 under electron irradiation

Katayama Naoyuki, Kojima Keita, Yamaguchi Tomoki, Hattori Sosuke, Tamura Shinya, Ohara Koji, Kobayashi Shintaro, Sugimoto Koudai, Ohta Yukinori, Saitoh Koh, Sawa Hiroshi

NPJ QUANTUM MATERIALS Vol. 6 ( 1 ) 2021.2

HAADF-STEM observation of unique quasicrystalline precipitates from solid solution in Mg-Cd-Yb system

Ohhashi Satoshi, Saitoh Koh, Kato Akira, Tsai An-Pang

MATERIALS CHARACTERIZATION Vol. 172 2021.2

Denoising of series electron holograms using tensor decomposition Invited Reviewed

Yuki Nomura, Kazuo Yamamoto, Satoshi Anada, Tsukasa Hirayama, Emiko Igaki, Koh Saitoh

Microscopy 2020.9

Development of a voltage-applicable heating specimen holder for in situ observations of solid oxide fuel cells with an environmental transmission electron microscope

Ishida Takafumi, Hiroshima Hideto, Higuchi Kimitaka, Tomita Masahiro, Saitoh Koh, Tanji Takayoshi

SURFACE AND INTERFACE ANALYSIS Vol. 52 ( 9 ) page： 584 - 590 2020.9

Operando STEM-EELS of an All-solid-state Li-ion Battery Using a Multi-variate Analysis Reviewed

Nomura Yuki, Yamamoto Kazuo, Hirayama Tsukasa, Igaki Emiko, Saitoh Koh

KENBIKYO Vol. 55 ( 2 ) page： 70 - 74 2020.8

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Microscopy

All-solid-state lithium-ion batteries (LIBs) are promising candidates of next-generation secondary batteries that have the potential to overcome the problems of conventional LIBs with liquid-electrolytes. However, it is known that the Li-ion conduction resistance at the electrode/solid-electrolyte interface limits their performance. It is important to elucidate interfacial phenomena at the nanometer scale and feed it back to material design. In this paper, we use scanning transmission electron microscopy (STEM) coupled with electron energy loss spectroscopy (EELS) to dynamically observe the distribution of Li and the electronic state of transition metals in an all-solid-state LIB during the charge-discharge reactions. The distribution of Li was quantitatively observed under dynamic conditions by applying multivariate analysis. The results showed that Li ions were heterogeneously extracted/inserted during the charge/discharge reaction, and that the activity of the electrochemical reaction depended on the Li-ion concentration at the original state (as deposition). The origin of the interfacial resistance was the electrochemically inactive Co3O4 formed at 10–20 nm near the interface.

DOI： 10.11410/kenbikyo.55.2_70

CiNii Research

Visualization of Lithium Transfer Resistance in Secondary Particle Cathodes of Bulk-Type Solid-State Batteries

Nomura Yuki, Yamamoto Kazuo, Hirayama Tsukasa, Igaki Emiko, Saitoh Koh

ACS ENERGY LETTERS Vol. 5 ( 6 ) page： 2098 - 2105 2020.6

Dynamic imaging of lithium in solid-state batteries by operando electron energy-loss spectroscopy with sparse coding

Nomura Yuki, Yamamoto Kazuo, Fujii Mikiya, Hirayama Tsukasa, Igaki Emiko, Saitoh Koh

NATURE COMMUNICATIONS Vol. 11 ( 1 ) 2020.6

Atom displacement detection of perovskite oxide in high resolution HAADF-STEM images by dictionary learning

Hattori Sosuke, Nomura Yuki, Saitoh Koh

Meeting Abstracts of the Physical Society of Japan Vol. 75.1 ( 0 ) page： 2279 - 2279 2020

Efficient Measurement of the Orbital-Angular-Momentum Spectrum of an Electron Beam via a Dammann Vortex Grating

Noguchi Yuuki, Nakayama Shota, Ishida Takafumi, Saitoh Koh, Uchida Masaya

PHYSICAL REVIEW APPLIED Vol. 12 ( 6 ) 2019.12

Smectic Liquid-Crystalline Structure of Skyrmions in Chiral Magnet Co8.5Zn7.5Mn4(110) Thin Film

Nagase T., Komatsu M., So Y. G., Ishida T., Yoshida H., Kawaguchi Y., Tanaka Y., Saitoh K., Ikarashi N., Kuwahara M., Nagao M.

PHYSICAL REVIEW LETTERS Vol. 123 ( 13 ) 2019.9

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Papers - SAITOH, Koh