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 Mn3Sn

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

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

Creating electron phase holograms using femtosecond laser interference processing

Uesugi Yuuki, Fukushima Ryota, Saitoh Koh, Sato Shunichi

OPTICS EXPRESS Vol. 27 ( 15 ) page： 20958 - 20964 2019.7

Laser Interference Processing of Electron Phase Holograms by Using a Femtosecond Laser

Uesugi Yuuki, Fukushima Ryota, Sato Shunichi, Saitoh Koh

Conference on Lasers and Electro-Optics:Science and Innovations 2019 page： SF1E.5. 2019.5

Laser Interference Processing of Electron Phase Holograms by Using a Femtosecond Laser

Uesugi Y., Fukushima R., Sato S., Saitoh K.

2019 Conference on Lasers and Electro-Optics, CLEO 2019 - Proceedings 2019.5

Language：English Publishing type：Research paper (scientific journal) Publisher：2019 Conference on Lasers and Electro-Optics, CLEO 2019 - Proceedings

Electron phase hologram was fabricated by a single-shot femtosecond laser interference processing. The generation of electron vortices from the fabricated hologram was demonstrated with higher diffraction efficiency than that of amplitude hologram as expected.

DOI： 10.23919/CLEO.2019.8750423

Scopus

Direct Observation of a Li-ionic Space-Charge Layer Formed at an Electrode/Solid-Electrolyte Interface

Y. Nomura, K.Yamamoto, T. Hirayama, S. Ouchi, E. Igaki, K. Saitoh

Angewandte Chemie Vol. 58 ( 16 ) page： 5292 - 5296 2019.4

Quantitative Operando Visualization of Electrochemical Reactions and Li Ions in All-Solid-State Batteries by STEM-EELS with Hyperspectral Image Analyses

Nomura Yuki, Yamamoto Kazuo, Hirayama Tsukasa, Ohkawa Mayumi, Igaki Emiko, Hojo Nobuhiko, Saitoh Koh

NANO LETTERS Vol. 18 ( 9 ) page： 5892-5898 2018.9

Electric shielding films for biased TEM samples and their application to in situ electron holography

Nomura Yuki, Yamamoto Kazuo, Hirayama Tsukasa, Saitoh Koh

MICROSCOPY Vol. 67 ( 3 ) page： 178-186 2018.6

Coherent pulse beam in spin-polarized TEM using an NEA photocathode

Kuwahara M., Ujihara T., Saitoh K., Tanaka N.

2018 31ST INTERNATIONAL VACUUM NANOELECTRONICS CONFERENCE (IVNC) page： . 2018

Observation of localized surface plasmon of gold octahedral nanoparticles using STEM-EELS

Mizuno Rira

Meeting Abstracts of the Physical Society of Japan Vol. 73.1 ( 0 ) page： 2499 - 2499 2018

Nearly nondiffracting electron lattice beams generated by polygonal slits

H. Nambu, Y. Noguchi, K. Saitoh, M. Uchida

Microscopy Vol. 66 ( 4 ) page： 295 - 299 2017.8

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

A method for generating electron lattice beams carrying vortices using nanofabricated polygonal slits in a transmission electron microscope is proposed. Experimental and simulation study of the intensity of the beams verified their Bessel beam-like nearly non- diffracting behavior. Phase analysis using a diffractive imaging method found arrays of quantized vortices, forming an electron beam lattice with cylindrical intensity distribu- tion in the propagation direction. Such vortex lattice beams may be used in a variety of applications including nanofabrication, particle manipulation or a new electron imaging method.

DOI： 10.1093/jmicro/dfx020

Web of Science

Introduction to Electron Phase Imaging

Saitoh Koh

KENBIKYO Vol. 52 ( 1 ) page： 3 2017.4

Determination of a 3D Displacement Field at a Vicinity of a GeSn/Ge Interface by the Phse Retrieval of Electron Rocking Curves Reviewed

M. Miura, S. Fujinami, K. Saitoh, N. Tanaka, O. Nakatsuka, S. Zaima

AMTC Letters Vol. 5 page： 46-47 2016

The Boersch effect in a picosecond pulsed electron beam emitted from a semiconductor photocathode Reviewed

M. Kuwahara, Y. Nambo, K. Aoki, K. Sameshima, X. Jin, T. Ujihara, H. Asano, K. Saitoh, Y. Takeda, and N. Tanaka

Applied Physics Letters Vol. 109 page： 013108 2016

Strain evolution of epitaxial tetragonal-like BiFeO3 thin films on LaAlO3(001) substrates prepared by sputtering and their bulk photovoltaic effect Reviewed

S. Nakashima, T. Uchida, K. Doi, K. Saitoh, H. Fujisawa, O. Sakata, Y. Katsuya, N. Tanaka, and M. Shimizu

Japanese Journal of Applied Physics Vol. 55 page： 101501 2016

Electron Diffractive imaging using Fork-Shaped Grating Masks Reviewed

H. Nambu, K. Saitoh, M. Uchida

AMTC Letters Vol. 5 page： 248-249 2016

In situ Observation of Interfaces between Metal Electrode and Solid Oxide Electrolyte Prepared by FIB Reviewed

T. Ishida, T. Tanji, M. Tomita, K, Higuchi, K. Saitoh

AMTC Letters Vol. 5 page： 62-63 2016

Measuring the Orbital Angular Momentum of Electron Vortex Beams Using a Forked Grating Reviewed

K. Saitoh, Y. Hasegawa, K. Hirakawa, N. Tanaka, and M. Uchida

Physical Review Letters Vol. 111 page： 074801 2013.8

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

The present study experimentally examines how an electron vortex beam with orbital angular momentum (OAM) undergoes diffraction through a forked grating. The nth-order diffracted electron vortex beam after passing through a forked grating with a Burgers vector of 1 shows an OAM transfer of n@. Hence, the diffraction patterns become mirror asymmetric owing to the size difference between the electron beams. Such a forked grating, when used in combination with a pinhole located at the diffraction plane, could act as an analyzer to measure the OAM of input electrons.

DOI： 10.1103/PhysRevLett.111.074801

Propagation Dynamics of Electron Vortex Pairs Reviewed

Y. Hasegawa, K. Saitoh, N. Tanaka, and M. Uchida

Journal of the Physical Society of Japan Vol. 82 page： 073402 2013.6

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

Electron vortex beams carrying orbital angular momentum have been experimentally realized very recently. Here, we present the generation and propagation dynamics of electron vortex pairs embedded in a single beam, using a nanofabricated holographic grating. The rotation of two electron vortices with the same topological charges and the annihilation of two electron vortices with opposite charges were observed. The experimental results are well explained by the Gouy phase shift and confirmed by numerical simulations of the propagation. The results of this study may help develop an intuitive understanding of electron vortex motion and give a new viewpoint for analyzing electron microscope images and phase change in a crystal.

DOI： 10.7566/JPSJ.82.073402

らせん状の波面をもつ電子波の生成、伝播、干渉 Invited Reviewed

齋藤晃、長谷川裕也、内田正哉

顕微鏡 Vol. 48 ( 1 ) page： 39-46 2013.4

Young's Interference Experiment with Electron Beams Carrying Orbital Angular Momentum Reviewed

Y. Hasegawa, K. Saitoh, N. Tanaka, S. Tanimura and M. Uchida

Journal of the Physical Society of Japan Vol. 82 page： 033002 2013.2

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

A Young's-type double-slit experiment using electron beams carrying orbital angular momentum (OAM) is demonstrated in a transmission electron microscope. Each of the slits is replaced by a grating mask with a fork dislocation, which generates electron beams with OAM as diðracted beams. Interference fringes produced by two diðracted electron beams with OAM appear at the observation screen. The interference fringe patterns exhibit dislocation features depending on the topological charges of the two electron beams. The experimental results clearly show the wave nature of the electron beams with OAM and gives potential applications in electron physics and quantum mechanics.

DOI： 10.7566/JPSJ.82.033002

HOLZ線図形をもちいたSiGe/Si界面近傍の格子湾曲および伸張歪みの解析 Invited Reviewed

齋藤晃

まてりあ Vol. 51 ( 8 ) page： 371-378 2012

30-kV spin-polarized transmission electron microscope with GaAs-GaAsP strained superlattice photocathode Reviewed

M. Kuwahara, S. Kusunoki, X. G. Jin, T. Nakanishi, Y. Takeda, K. Saitoh, T. Ujihara, H. Asano, and N. Tanaka

Vol. 101 ( 3 ) page： 033102 2012

Electron interference from an amorphous thin film on a crystal transmission electron microscopy specimen Reviewed

Rodney A. Herring, Koh Saitoh, Takayoshi Tanji, and Nobuo Tanaka

Journal of Electron Microscopy Vol. 61 page： 17-23 2012

Production of electron vortex beams carrying large orbital angular momentum using spiral zone plates Reviewed

Koh Saitoh, Yuya Hasegawa, Nobuo Tanaka, and Masaya Uchida

Journal of Electron Microscopy Vol. 61 ( 3 ) page： 171-177 2012

Analysis of thickness modulation in GaAs/GaAsP strained superlattice by TEM observation Invited Reviewed

Xiuguang Jin, Hirotaka Nakahara, Koh Saitoh, Takashi Saka, Toru Ujihara, Nobuo Tanaka, Yoshikazu Takeda

Journal of Crystal Growth Vol. 353 page： 84-87 2012

内殻励起をともなう非弾性散乱をもちいた電子構造異方性解析 Invited Reviewed

齋藤晃

顕微鏡 Vol. 47 ( 4 ) page： 228-237 2012

Observation of the hole state symmetry of MgB2 by inelastic scattering of fast electrons accompanied by boron K-shell excitation Reviewed

K. Saitoh, K. Momonoi, N. Tanaka, and S. Onari

Journal of Applied Physics Vol. 112 page： 113920 2012

Three-dimensional reconstruction of the atomic arrangement of icosahedral quasicrystals by binary discrete tomography Reviewed

Y. Ishibashi, H. Sugiura, K. Saitoh, and N. Tanaka

Philosophical Magazine Letters Vol. 91 ( 9 ) page： 632-639 2011

Automated characterization of bending and expansion of a lattice of a Si substrate near a SiGe/Si interface by using split HOLZ line patterns Reviewed

K. Saitoh, Y. Yasuda, M. Hamabe and N. Tanaka

J. Electron Microsc. Vol. 59 page： 367-378 2010.10

Coherent electron interference from amorphous TEM specimens Reviewed

R. A. Herring, K. Saitoh, N. Tanaka and T. Tanji

J. Electron Microsc. Vol. 59 page： 321-330 2010.10

Atom-column distinction by Kikuchi pattern observed by an aberration-corrected convergent electron probe Reviewed

K. Saitoh, Y. Tatara and N. Tanaka

J. Electron Microsc. Vol. 59 page： 387-394 2010.10

Factors Affecting Extreme Ultraviolet Reflectivity of Mo/Si Multilayer FilmsSynthesized by Superconducting Magnetron Sputtering Reviewed

Uichiro Mizutani, Takashi Yamaguchi, Tetsuya Tomofuji, Yousuke Yanagi,Yoshitaka Itoh, Koh Saitoh, Nobuo Tanaka, Noriaki Matsunami, and Hiroshi Ikuta

Japanese Journal of Applied Physics Vol. 48 page： 025507-1-6 2009.2

Observation of the three-dimensional q-dependence of inelastic scattering cross-section of the K-shell excitation of graphite Reviewed

K. Saitoh, K. Nagasaka and N. Tanaka

International Journal of Advanced Microscopy and Theoretical Calculations Vol. 1 page： 92 2008.6

Structure refinement of a decagonal Al72Ni20Co8 quasicrystal by using convergent-beam electron diffraction

Hiroki Murakami, Koh Saitoh, Nobuo Tanaka and An Pang Tsai

International Journal of Advanced Microscopy and Theoretical Calculations Vol. 1 page： 88-89 2008.6

Automated lattice-parameter determination by using HOLZ line patterns

Koh Saitoh, Yoshifumi Yasuda and Nobuo Tanaka

International Journal of Advanced Microscopy and Theoretical Calculations Vol. 1 page： 90-91 2008.6

Structure refinement of a decagonal quasicrystal of Al72Ni20Co8by convergent-beam electron diffraction Reviewed

Koh Saitoh, Hiroki Murakami and Nobuo Tanaka

Zeitschrift fuer Kristallographie Vol. 223 page： 859-862 2008

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

Structure refinement of a water quenched alloy of Al72Ni20Co8, which is known as a highly ordered decagonal quasicrystal, has been carried out by quantitative comparison of experimental and simulated intensities of convergent-beam electron diffraction (CBED) patterns. In the present study, higher-order Laue zone reflections, whose intensities are sensitively changed with atom positions, have been used for the refinement of atom position parameters in the quasiperiodic directions. The refined parameters have been compared with the results obtained by X-ray diffraction.

収束電子回折法によって明らかにしたCd系正20面体準結晶の特異な対称性 Invited

齋藤晃、横澤忠洋

日本結晶学会誌 Vol. 49 page： 34-39 2007

ALCHEMI study of chemical order in Al-Cu-Co decagonal quasicrystals Reviewed

K. Saitoh and A. P. Tsai

Philosophical Magazine Vol. 87 ( 18-21 ) page： 2741 - 2746 2007

Structural disorder of the atom cluster in a highly-ordered decagonal quasicrystal of Al72Ni20Co8 Reviewed

K. Saitoh, N. Tanaka, A. P. Tsai and K. Ishizuka

Philosophical Magazine Vol. 87 ( 18-21 ) page： 2733 - 2739 2007

Observation of the anisotropy of the inelastic scattering of fast electrons accompanied by the K-shell ionization of a carbon nanotube Reviewed

K. Saitoh, K. Nagasaka and N. Tanaka

Journal of Electron Microscopy Vol. 55 ( 6 ) page： 281 - 288 2006

Direct observation of oxygen atoms in rutile titanium dioxide by spherical aberration corrected high-resolution transmission electron microscopy Reviewed

K. Yoshida, T. Kawai, T. Nambara, S. Tanemura, K. Saitoh and N. Tanaka

Nanotechnology Vol. 17 page： 3944−3950 2006

Direct observation of six-membered rings in the upper and lower walls of a single-wall carbon nanotube by spherical aberration-corrected HRTEM Reviewed

K. Hirahara, K. Saitoh, J. Yamasaki and N. Tanaka

NANO LETTERS Vol. 6 page： 1778 2006

HAADF-STEM法による高分解能Z コントラスト像観察 Invited

齋藤晃

日本結晶学会誌 Vol. 47 page： 9-14 2005

Formation of a superlattice order from a fundamental-lattice decagonal quasicrystal of Al72Ni20Co8 Reviewed

K. Saitoh, T. Yokosawa, M. Tanaka, A. P. Tsai

Journal of the Physical Society of Japan Vol. 73 ( 7 ) page： 1786-1792 2004

ALCHEMI study of an S1-type superlattice-ordered decagonal quasicrystal of Al70 Ni18 Co12 Reviewed

K. Saitoh, M. Tanaka and A. P. Tsai

J. Non-Cryst. Solids Vol. 334&335 page： 202-206 2004

In-situ HREM observation of the structural change from a fundamental-lattice decagonal quasicrystal of Al72Ni20Co8 to the S1 type superlattice phase Reviewed

K. Saitoh, T. Yokosawa, M. Tanaka, A. P. Tsai

Ferroelectrics Vol. 305 page： 253−256 2004

High-temperature phase transition in lanthanum titanate perovskite La-0.64(Ti-0.92,Nb-0.08)O-3 Reviewed

M. Yashima M, Mori M, Kamiyama T, Oikawa K, Hoshikawa A, Torii S, Saitoh K and Tsuda K

Chemical Physics Letters Vol. 375 page： 240-246 2003

Structural study of an Al-Co approximant by high-angle annular dark-field scanning transmission electron microscopy Reviewed

T. Yokosawa, K. Saitoh, M. Tanaka, A. P. Tsai

J. Phys. Soc. Jpn. Vol. 71 page： 2601 2002

Stacking sequences of atom-clusters in decagonal quasicrystals and their approximants Reviewed

Koh Saitoh and Michiyoshi Tanaka

J. Alloys and Comps. Vol. 342 page： 130 - 133 2002

Control of crystal polarity in a wurtzite crystal: ZnO films grown by plasma-assisted molecular-beam epitaxy on GaN Reviewed

S.-K. Hong, T. Hanada, H.-J. Ko, Y. Chen, T. Yao, D. Imai, K. Araki, M. Shinohara, K. Saitoh, M. Terauchi

Phys. Rev. B Vol. 65 page： 115331 2002

Distinction between the Space Groups having Rotation and Screw Axes, Which are Combined with 2 Fold Rotation Axes, using the Coherent Convergent-beam Electron Diffraction Method Reviewed

K. Saitoh, K. Tsuda, M. Terauchi, M. Tanaka

Acta Crystallographica A Vol. 57 page： 219 - 230 2001

Space-group determination of cubic and its superlattice-ordered rhombohedral phases of Zn63Mg23Er14 using the convergent-beam electron diffraction method Reviewed

Koh Saitoh, Aris Kounis, Gerhert Miehe, Hartmut Fuess, Roland Sterzel and W. Assmus

Z. Kristallogr. Vol. 216 page： 1 - 4 2001

ALCHEMI study of an Al72Ni20Co8 decagonal quasicrystal Reviewed

Koh Saitoh, Michiyoshi Tanaka, An Pang Tsai and Chris J. Rossouw

J. Phys. Soc. Jpn. Vol. 69 page： 2379 - 2382 2000

A new structural model of an Al72Ni20Co8 decagonal quasicrystal Reviewed

Koh Saitoh, Kenji Tsuda and Michiyoshi Tanaka

Journal of the Physical Society of Japan Vol. 67 page： 2578 - 2580 1998

Experimental verification of the quasi-unit-cell model of quasicrystal structure Reviewed

P. J. Steinhardt, H. C. Jeong, K. Saitoh, M. Tanaka, E. Abe, A. P. Tsai

Nature Vol. 396 page： 55 1998

Structural Study of Al72Ni20Co8 Decagonal Quasicrystal by High-Angle Annular Dark-Field method Reviewed

Koh Saitoh, Kenji Tsuda, Michiyoshi Tanaka, Kenji kaneko and An Pang Tsai

Japanese Journal of Applied Physics Vol. 36 page： L1400 - L1402 1997

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