Faculty Profiles - ISHIDA Takafumi

Papers - ISHIDA Takafumi

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Characterization of the INTPIX4 SOI pixel detector in transmission electron microscopy at 120 and 200 keV Reviewed International journal

Yuichi Ishida, Takafumi Ishida, Makoto Kuwahara, Yasuo Arai, Koh Saitoh

Microscopy 2025.5

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

Takafumi Ishida , Kosei Sugie , Toshinobu Miyoshi , Yuichi Ishida , Koh Saitoh , Yasuo Arai , Makoto Kuwahara

Microscopy Vol. 73 ( 6 ) page： 511 - 516 2024.12

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

Yoshiki Tanaka, Xi Yu, Shusaku Terakawa, Takafumi Ishida, Koh Saitoh, Hongwei Zhang, Toru Asaka, Fumihiro Itoigawa, Makoto Kuwahara, Shingo Ono

ACS Omega Vol. 8 ( 8 ) page： 7932 - 7939 2023.2

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

Xi Yu, Yoshiki Tanaka, Tomoki Kakiuchi, Takafumi Ishida, Koh Saitoh, Fumihiro Itoigawa, Makoto Kuwahara, Shingo Ono

Micromachines Vol. 14 ( 1 ) page： 185 2023.1

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

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

Applied Physics Express Vol. 15 ( 11 ) page： 115001 2022.11

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

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

Applied Physics Letters Vol. 121 ( 14 ) page： 143503 2022.10

Thin film growth of Ba(Zn,Fe)(2)As-2 by molecular beam epitaxy Reviewed

Ikegami R., Hatano T., Kiyozawa T., Ishida T., Tomizawa Y., Iida K., Ikuta H.

THIN SOLID FILMS Vol. 758 2022.9

Language：English Publishing type：Research paper (scientific journal) Publisher：Thin Solid Films

We have grown Ba(Zn1-xFex)2As2 thin films by molecular beam epitaxy. Epitaxial thin films with various Fe contents up to x = 0.16 were obtained by employing fluoride substrates and supplying Zn and As in excess. The film of the parent compound BaZn2As2 showed a metallic behavior in the temperature range of 50–300 K, although semiconducting behavior with a bandgap of 0.23 eV has been reported for a polycrystalline bulk sample. The metallic behavior can be ascribed to a defect layer near the film/substrate interface that was found by a cross-sectional microstructure observation. For the Fe-substituted films, on the other hand, no such defect layer was observed, and the temperature dependence of resistivity showed semiconducting behavior. BaZn2As2 is known as a parent compound of diluted magnetic semiconductors, but the magnetization measurements of the Fe doped films showed no evidence of ferromagnetic order.

DOI： 10.1016/j.tsf.2022.139420

Web of Science

Scopus

Observation of domain wall bimerons in chiral magnets Reviewed

T. Nagase, Y. So, H. Yasui, T. ishida, H. Yoshida, Y. Tanaka, K. Saitoh, N. Ikarashi, Y. Kawaguchi, M. Kuwahara, M. Nagao

Nature Communications Vol. 12 ( 1 ) page： 3490 2021.6

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

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

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

Intensity Interference in a Coherent Spin-Polarized Electron Beam Reviewed

M. Kuwahara, Y. Yoshida, W. Nagata, K. Nakakura, M. Furui, T. Ishida, K. Saitoh, T. Ujihara, N. Tanaka

Physical Review Letters Vol. 126 page： 125501 2021.3

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

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

SURFACE AND INTERFACE ANALYSIS Vol. 52 ( 9 ) page： 584 - 590 2020.8

Time-resolved Transmission Electron Microscope Using Pulsed Electron Waves

Kuwahara Makoto, Yokoi Rina, Mizuno Lira, Togashi Nobutaka, Yoshida Yuya, Nagata Wataru, Furui Masato, Nakakura Kojiro, Ishida Takafumi

KENBIKYO Vol. 55 ( 3 ) page： 131 - 138 2020

Language：Japanese Publisher：The Japanese Society of Microscopy

<p>Pulsed electron wave-packet had been applied to a transmission electron microscopy (TEM) to improve the time-resolution. The pulsed electrons are created by photoemission process using a combination of a photocathode material and pulsed laser. We review time-scales of phenomena, performance of photocathodes and recent researches of time-resolved TEM. Especially the energy and momentum spreads of photocathode is discussed by our experimental result of time-resolved TEM using an NEA semiconductor photocathode. To introduce a novel electron microscopy using a quantum effect, we explain quantum physics in TEM involving special relativity, Dirac equation and a notation of two component spinor. Finally, we discuss key technologies and significant parameters for high temporal and high spatial resolutions.</p>

DOI： 10.11410/kenbikyo.55.3_131

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

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 Reviewed

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

Enhanced Hollow-cone Illumination TEM technique for Dynamical Observations of Light-elemens in Matereials Reviewed

T. Kawasaki, T. Ishida, A. Kuwabara and Y. Ikuhara

AMTC Letters Vol. 6 page： 114-115 2019

Operando STEM-EELS Observation of Anodic Reactions in Solid Oxide Fuel Cells Reviewed

Vol. 6 page： 112-113 2019

Phase-contrast Imaging by Annularly Arrayed Detectors in Hollow-cone Illumination STEM

Ishida Takafumi, Kawasaki Tadahiro, Tanji Takayoshi, Ikuta Takashi

KENBIKYO Vol. 52 ( 1 ) page： 13 - 18 2017

Language：Japanese Publisher：The Japanese Society of Microscopy

<p>We have developed a method that is able to reveal the phase shifts of electron waves using an annular aperture and annularly arrayed detectors in scanning transmission electron microscopy (STEM). The reconstructed phase image using this method will have the potential for the observation of thick crystalline specimens within the kinematical approximation, since this technique has an expanded focal depth, which reduces the blurring. In this paper, we will introduce details of this method and the STEM system, and recent results.</p>

DOI： 10.11410/kenbikyo.52.1_13

Development of electrostatic spherical aberration corrector using annular and circular electrodes Reviewed

T. Kawasaki, T. Ishida, Y. Takai, Y. Ogawa, M. Lomita, T. Matsutani, T. Kodama, T. Ikuta

Surface and Interface Analysis Vol. 48 ( 11 ) page： 1160-1165 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： 46-47 2016

Phase reconstruction in annular bright-field scanning transmission electron microscopy Reviewed

T. Ishida, T. Kawasaki, T. Tanji, T. Kodama, T. Matsutani, K. Ogai, T. Ikuta

Microscopy Vol. 64 page： 69–76 2015

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Papers - ISHIDA Takafumi