研究者詳細 - 齋藤　晃

論文 - 齋藤　晃

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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年9月

Near-field electron ptychography using full-field structured illumination

Tamaki, H; Saitoh, K

MICROSCOPY 2024年7月

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年6月

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 160 巻 ( 18 ) 2024年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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 73 巻 ( 3 ) 頁： 262 - 274 2023年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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 62 巻 ( 35 ) 頁： 14207 - 14215 2023年8月

Measurement and correction of TEM image distortion using arbitrary samples

Tamaki Hirokazu, Saitoh Koh

MICROSCOPY 2023年2月

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

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

ACS Omega 8 巻 ( 8 ) 頁： 7932 - 7939 2023年

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

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

Micromachines 14 巻 ( 1 ) 頁： 185 2023年

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 71 巻 ( 6 ) 頁： 374 - 379 2022年12月

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 15 巻 ( 11 ) 2022年11月

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 121 巻 ( 14 ) 2022年10月

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年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

透過電子顕微鏡による圧縮センシング

野村優貴, 穴田智史, 山本和生, 平山司, 齋藤晃

顕微鏡 56 巻 ( 3 ) 頁： 116 - 123 2021年12月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：公益社団法人日本顕微鏡学会

<p>不十分な数の観測データから原信号を推定する圧縮センシング技術における根幹は，原信号に含まれるパターンや法則を見つけ出すことであり，その目的において機械学習は非常に有効な手段である．本解説では，走査透過電子顕微鏡法・電子エネルギー損失分光法・電子線ホログラフィーに対して，それぞれに含まれるパターンや法則を，それぞれの信号特性に適する統計的信号処理（スパースコーディング／テンソル分解）によって抽出し，原信号を高精度に推定する技術を紹介する．</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 12 巻 ( 1 ) 2021年6月

Denoising of series electron holograms using tensor decomposition

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

MICROSCOPY 70 巻 ( 3 ) 頁： 255 - 264 2021年6月

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 70 巻 ( 3 ) 頁： 321 - 325 2021年6月

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 126 巻 ( 12 ) 2021年3月

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 6 巻 ( 1 ) 2021年2月

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