Faculty Profiles - SAITOH, Koh

Papers - SAITOH, Koh

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Surface sensitivity of atomic-resolution secondary electron imaging

Saitoh, K; Oyobe, T; Igarashi, K; Sato, T; Matsumoto, H; Inada, H; Endo, T; Miyata, Y; Usami, R; Takenobu, T

MICROSCOPY 2024.9

Near-field electron ptychography using full-field structured illumination

Tamaki, H; Saitoh, K

MICROSCOPY 2024.7

Development of silicon-on-insulator direct electron detector with analog memories in pixels for sub-microsecond imaging

Ishida, T; Sugie, K; Miyoshi, T; Ishida, Y; Saitoh, K; Arai, Y; Kuwahara, M

MICROSCOPY 2024.6

Giant impurity effect on anomalous Hall effect of Mn<sub>3</sub>Sn

Yano, R; Kihara, S; Yoneda, M; Vu, HTN; Suto, H; Katayama, N; Yamaguchi, T; Kuwahara, M; Suzuki, MT; Saitoh, K; Kashiwaya, S

JOURNAL OF CHEMICAL PHYSICS Vol. 160 ( 18 ) 2024.5

Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Chemical Physics

Mn3Sn is an anomalous Hall effect (AHE) antiferromagnet that exhibits the hysteretic AHE in antiferromagnetic (AFM) phase at room temperature. We report that whisker Mn3Sn crystals grown by the flux method exhibit a non-hysteretic AHE at mid-to-low temperatures when the whisker Mn3Sn is surrounded by a thin layer of ferromagnetic Mn2−xSn. These crystals exhibit a hysteretic AHE above 275 K due to the spin alignment of the inverse triangular lattice, which is similar to other crystals. However, upon cooling the crystal, it exhibits a non-hysteretic AHE with a spiral AFM spin structure at 100-200 K. We concluded that the non-hysteretic AHE is induced at the interface of Mn2−xSn/Mn3Sn. We believe that the scalar-spin chirality in the spiral AFM phase of Mn3Sn, modulated by Mn2−xSn through the magnetic proximity effect, produces the AHE. This discovery opens a new avenue for tailoring the AHE by magnetic layers.

DOI： 10.1063/5.0195211

Web of Science

Scopus

PubMed

Phase retrieval of electron rocking curves using total variation and total squared variation regularizations

Shichi, A; Ishizuka, H; Saitoh, K

MICROSCOPY Vol. 73 ( 3 ) page： 262 - 274 2023.11

Language：English Publishing type：Research paper (scientific journal) Publisher：Microscopy

In this study, a new method for the phase retrieval of electron rocking curves observed using convergent-beam electron diffraction, which is applicable to the determination of three-dimensional lattice displacement fields along the beam direction, is proposed. Total variation and total squared variation regularizations are introduced for phase retrieval to suppress overfitting to noise or background signals in the rocking curves and to reproduce the sparse characteristics of displacement fields, which exist only near lattice defects. The results show that the proposed algorithm is effective for rocking curves modulated by the dynamical effect of electron diffraction. The accuracy of phase reconstruction using the proposed method is also discussed. Phase retrieval of the experimental rocking curves obtained from a stacking fault in stainless steel is demonstrated.

DOI： 10.1093/jmicro/dfad048

Web of Science

Scopus

PubMed

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

Carbonization of a Molybdenum Substrate Surface and Nanoparticles by a One-Step Method of Femtosecond Laser Ablation in a Hexane Solution Reviewed

Y. Tanaka, X. Yu, S. Terakawa, T. Ishida, K. Saitoh, H. Zhang, T. Asaka, F. Itoigawa, M. Kuwahara, S. Ono

ACS Omega Vol. 8 ( 8 ) page： 7932 - 7939 2023

Static Hydrophobic Cuprous Oxide Surface Fabricated via One-Step Laser-Induced Oxidation of a Copper Substrate Reviewed

X. Yu, Y. Tanaka, T. Kakiuchi, T. Ishida, K. Saitoh, F. Itoigawa, M. Kuwahara, S. Ono

Micromachines Vol. 14 ( 1 ) page： 185 2023

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

Surface cleavage of zinc oxide induced by femtosecond laser irradiation

Yu X., Takeda Y., Hamasaki S., Ishida T., Kuwahara M., Saitoh K., Itoigawa F., Ono S.

2022 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2022 - Proceedings 2022

Language：English Publishing type：Research paper (scientific journal) Publisher：2022 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2022 - Proceedings

Cleavage along the crystalline and cleavage-melt shift were observed on the surface of a ZnO substrate when it was irradiated by single and multiple femtosecond laser pulses, respectively.

DOI： 10.1109/CLEO-PR62338.2022.10432217

Scopus

Surface cleavage of zinc oxide induced by femtosecond laser irradiation

Yu X., Takeda Y., Hamasaki S., Ishida T., Kuwahara M., Saitoh K., Itoigawa F., Ono S.

Optics InfoBase Conference Papers 2022

Language：English Publishing type：Research paper (scientific journal) Publisher：Optics InfoBase Conference Papers

Cleavage along the crystalline and cleavage-melt shift were observed on the surface of a ZnO substrate when it was irradiated by single and multiple femtosecond laser pulses, respectively.

DOI： 10.1364/CLEOPR.2022.P_CTh5_03

Scopus

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

<p>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).</p>

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

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Papers - SAITOH, Koh