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Employment (5)

Tohoku University: Sendai, JP

2018-04-01 to present | Assistant professor (Advanced Institute for Materials Research (AIMR))
Employment
Source: Self-asserted source
Hirofumi Oka

Tohoku University: Sendai, JP

2017-04-01 to 2018-03-31 | Research associate (Advanced Institute for Materials Research (AIMR))
Employment
Source: Self-asserted source
Hirofumi Oka

Tohoku University: Sendai, JP

2014-09-01 to 2017-03-31 | Postdoctoral researcher (Institute of Multidisciplinary Research for Advanced Materials (IMRAM, or Tagen-Ken in Japanese))
Employment
Source: Self-asserted source
Hirofumi Oka

Max Planck Institute of Microstructure Physics: Halle, DE

2008-06-01 to 2014-08-31 | Postdoctoral researcher
Employment
Source: Self-asserted source
Hirofumi Oka

Hokkaido University: Sapporo, JP

2004-04-01 to 2008-05-31 | Postdoctoral researcher (Graduate School of Information Science and Technology)
Employment
Source: Self-asserted source
Hirofumi Oka

Education and qualifications (3)

Hokkaido University: Sapporo, JP

2001-04-01 to 2004-03-25 | Ph.D. (Graduate School of Engineering)
Qualification
Source: Self-asserted source
Hirofumi Oka

Hokkaido University: Sapporo, JP

1999-04-01 to 2001-03-23 | Master (Graduate School of Engineering)
Qualification
Source: Self-asserted source
Hirofumi Oka

Hokkaido University: Sapporo, JP

1995-04-01 to 1999-03-25 | Bachelor (Faculty of Engineering)
Qualification
Source: Self-asserted source
Hirofumi Oka

Works (37)

Origin of electrocatalytic nitrogen reduction activity over transition metal disulfides: critical role of <i>in situ</i> generation of S vacancy

Journal of Materials Chemistry A
2024 | Journal article
Contributors: Wang, Tianyi; Guo, Zhongyuan; Oka, Hirofumi; Kumatani, Akichika; Liu, Chuangwei; Li, Hao
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Moire-Assisted Realization of Octahedral MoTe<sub>2</sub> Monolayer

Advanced Science
2023 | Journal article
Contributors: Saruta, Yasuaki; Sugawara, Katsuaki; Oka, Hirofumi; Kawakami, Tappei; Kato, Takemi; Nakayama, Kosuke; Souma, Seigo; Takahashi, Takashi; Fukumura, Tomoteru; Sato, Takafumi
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Charge-density wave associated with higher-order Fermi-surface nesting in monolayer VS2

npj 2D Materials and Applications
2023-05-02 | Journal article
Contributors: Tappei Kawakami; Katsuaki Sugawara; Hirofumi Oka; Kosuke Nakayama; Ken Yaegashi; Seigo Souma; Takashi Takahashi; Tomoteru Fukumura; Takafumi Sato
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Charge order with unusual star-of-David lattice in monolayer NbTe2

Physical Review B
2023-01-17 | Journal article
Contributors: Taiki Taguchi; Katsuaki Sugawara; Hirofumi Oka; Tappei Kawakami; Yasuaki Saruta; Takemi Kato; Kosuke Nakayama; Seigo Souma; Takashi Takahashi; Tomoteru Fukumura et al.
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Magnetic Hysteresis of Single-Molecule Magnets Adsorbed on Ferromagnetic Substrate (Retraction of November, 2021)

ACS Nano
2021 | Journal article
Contributors: Qi, Zhi Kun; Mishra, Puneet; Ara, Ferdous; Oka, Hirofumi; Sainoo, Yasuyuki; Katoh, Keiichi; Yamashita, Masahiro; Komeda, Tadahiro
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Single Molecular Adsorption of Terbium(III) Bis-phthalocyaninato (TbPc2) Governed by Two Surface Reconstructions of Perovskite Type SrVO3 Epitaxial Ultrathin Film

Chemistry Letters
2021 | Journal article
Contributors: Oka, Hirofumi; Katoh, Keiichi; Okada, Yoshinori; Oka, Daichi; Hitosugi, Taro; Yamashita, Masahiro; Fukumura, Tomoteru
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Robust charge-density wave strengthened by electron correlations in monolayer 1T-TaSe2 and 1T-NbSe2

Nature Communications
2021-10-07 | Journal article
Contributors: Yuki Nakata; Katsuaki Sugawara; Ashish Chainani; Hirofumi Oka; Changhua Bao; Shaohua Zhou; Pei-Yu Chuang; Cheng-Maw Cheng; Tappei Kawakami; Yasuaki Saruta et al.
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Width-induced metal–insulator transition in SrVO3 lateral nanowires spontaneously formed on the ultrathin film

Applied Physics Letters
2020-08-03 | Journal article
Contributors: Hirofumi Oka; Yoshinori Okada; Kenichi Kaminaga; Daichi Oka; Taro Hitosugi; Tomoteru Fukumura
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Heteroepitaxy of Rock-salt Superconductor/Ferromagnet Thin Film: LaO/EuO

Chemistry Letters
2019 | Journal article
Contributors: Kaminaga, Kenichi; Oka, Daichi; Oka, Hirofumi; Fukumura, Tomoteru
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Spin properties of single-molecule magnet of double-decker Tb(III)-phthalocyanine (TbPc2) on ferromagnetic Co film characterized by spin polarized STM (SP-STM)

Journal of Applied Physics
2019 | Journal article
Contributors: Ara, Ferdous; Oka, Hirofumi; Sainoo, Yasuyuki; Katoh, Keiichi; Yamashita, Masahiro; Komeda, Tadahiro
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Two distinct surface terminations of SrVO3 (001) ultrathin films as an influential factor on metallicity

Applied Physics Letters
2018 | Journal article
Contributors: Oka, Hirofumi; Okada, Yoshinori; Hitosugi, Taro; Fukumura, Tomoteru
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Spatially Resolved Magnetic Anisotropy of Cobalt Nanostructures on the Au(111) Surface

Nano Letters
2017 | Journal article
Contributors: Puneet Mishra; Zhi Kun Qi; Hirofumi Oka; Kohji Nakamura; Tadahiro Komeda
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Temperature dependence of the superconducting proximity effect quantified by scanning tunneling spectroscopy

AIP Advances
2015 | Journal article
Contributors: Stepniak, A.; Caminale, M.; Vanegas, A. A. Leon; Oka, H.; Sander, D.; Kirschner, J.
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Atomic layer superconductivity

Surface and Interface Analysis
2014 | Journal article
Contributors: Stepniak, Agnieszka; Vanegas, Augusto Leon; Caminale, Michael; Oka, Hirofumi; Sander, Dirk; Kirschner, Juergen
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Atomic structure and spin polarization at the apex of tips used in spin-polarized scanning tunneling microscopy

Applied Physics Express
2014 | Journal article
Contributors: Shigekazu Nagai; Koichi Hata; Hirofumi Oka; Dirk Sander; Jürgen Kirschner
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Spin-polarized quantum confinement in nanostructures: Scanning tunneling microscopy

Reviews of Modern Physics
2014 | Journal article
Contributors: Hirofumi Oka; Oleg O. Brovko; Marco Corbetta; Valeri S. Stepanyuk; Dirk Sander; Jürgen Kirschner
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The impact of structural relaxation on spin polarization and magnetization reversal of individual nano structures studied by spin-polarized scanning tunneling microscopy

Journal of Physics: Condensed Matter
2014 | Journal article
Contributors: Sander, Dirk; Phark, Soo-Hyon; Corbetta, Marco; Fischer, Jeison A.; Oka, Hirofumi; Kirschner, Juergen
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Threshold of magnetic field response of the superconducting proximity effect for ultrathin Pb/Ag metallic films

Physical Review B
2014 | Journal article
Contributors: Caminale, M.; Vanegas, A. A. Leon; Stepniak, A.; Oka, H.; Sander, D.; Kirschner, J.
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New insights into nano-magnetism by spin-polarized scanning tunneling microscopy

Journal of Electron Spectroscopy and Related Phenomena
2013 | Journal article
Contributors: Dirk Sander; Hirofumi Oka; Marco Corbetta; Valeri Stepanyuk; Jürgen Kirschner
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Magnetic Response and Spin Polarization of Bulk Cr Tips for In-Field Spin-Polarized Scanning Tunneling Microscopy

Japanese Journal of Applied Physics
2012 | Journal article
Contributors: Corbetta, Marco; Ouazi, Safia; Borme, Jerome; Nahas, Yasmine; Donati, Fabio; Oka, Hirofumi; Wedekind, Sebastian; Sander, Dirk; Kirschner, Juergen
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Magnetization Reversal of Individual Co Nanoislands

Physical Review Letters
2012 | Journal article
Contributors: S. Ouazi; S. Wedekind; G. Rodary; H. Oka; D. Sander; J. Kirschner
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Spin-dependent Smoluchowski effect

Physical Review B
2012 | Journal article
Contributors: Polyakov, O. P.; Corbetta, M.; Stepanyuk, O. V.; Oka, H.; Saletsky, A. M.; Sander, D.; Stepanyuk, V. S.; Kirschner, J.
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The electronic properties of Co nanowires on Cu(110)-p(2x3)N

Surface Science
2012 | Journal article
Contributors: Wedekind, Sebastian; Donati, Fabio; Oka, Hirofumi; Rodary, Guillemin; Sander, Dirk; Kirschner, Juergen
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New insights into nanomagnetism: spin-polarized scanning tunneling microscopy and spectroscopy studies

Proceedings of SPIE - The International Society for Optical Engineering
2011 | Conference paper
Contributors: Oka, Hirofumi; Rodary, Guillemin; Wedekind, Sebastian; Ignatiev, Pavel A.; Niebergall, Larissa; Stepanyuk, Valeri S.; Sander, Dirk; Kirschner, Juergen
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Spatially Modulated Tunnel Magnetoresistance on the Nanoscale

Physical Review Letters
2011 | Journal article
Contributors: Hirofumi Oka; Kun Tao; Sebastian Wedekind; Guillemin Rodary; Valeri S. Stepanyuk; Dirk Sander; Jürgen Kirschner
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Switching Fields of Individual Co Nanoislands

IEEE Transactions on Magnetics
2011 | Journal article
Contributors: Sebastian Wedekind; Guillemin Rodary; Jérôme Borme; Safia Ouazi; Yasmine Nahas; Marco Corbetta; Hirofumi Oka; Dirk Sander; Jürgen Kirschner
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Spin-Dependent Quantum Interference Within a Single Magnetic Nanostructure

Science
2010 | Journal article
Contributors: H. Oka; P. A. Ignatiev; S. Wedekind; G. Rodary; L. Niebergall; V. S. Stepanyuk; D. Sander; J. Kirschner
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Characterization of tips for spin-polarized scanning tunneling microscopy

Applied Physics Letters
2009 | Journal article
Contributors: G. Rodary; S. Wedekind; H. Oka; D. Sander; J. Kirschner
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Scanning Tunneling Microscopy and Spectroscopy on $c(3\sqrt{2}{\times}\sqrt{2})$R45°-C-Reconstructed Cr(001) Thin-Film Surfaces

Japanese Journal of Applied Physics - Special Issues
2008 | Journal article
Contributors: Hirofumi Oka; Kazuhisa Sueoka
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Carbon-Induced Superstructure on Cr(001) Thin-Film Surfaces

Japanese Journal of Applied Physics - Special Issues
2007 | Journal article
Contributors: Hirofumi Oka; Akira Nakai; Kazuhisa Sueoka
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Inhomogeneous surface electronic properties and charge ordering in epitaxial Fe3O4 films On MgO(001)

Physica Status Solidi (B)
2007 | Journal article
Contributors: Subagyo, A.; Sasaki, Y.; Oka, H.; Sueoka, K.
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Local electronic properties of domain boundaries on c(2 x 2) Fe(001) thin film surfaces

INTERNATIONAL JOURNAL OF NANOSCIENCE, VOL 5, NO 6
2006 | Journal article
Contributors: Oka, Hirofumi; Subagyo, Agus; Sueoka, Kazuhisa
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Spin-polarized scanning tunneling microscopy and spectroscopy study of c(2×2) reconstructed Cr(001) thin film surfaces

Journal of Applied Physics
2006 | Journal article
Contributors: Hirofumi Oka; Kazuhisa Sueoka
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Connection of Herringbone Ridges on Reconstructed Au(111) Surfaces Observed by Scanning Tunneling Microscopy

Japanese Journal of Applied Physics - Special Issues
2005 | Journal article
Contributors: Hirofumi Oka; Kazuhisa Sueoka
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Atomic scale observation of domain boundaries on c(2 x 2) Fe(001) thin film surfaces

Japanese Journal of Applied Physics
2002 | Journal article
Contributors: Oka, H; Subagyo, A; Sawamura, M; Sueoka, K; Mukasa, K
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Scanning tunneling spectroscopy of c(2 x 2) reconstructed Fe thin-film surfaces

Japanese Journal of Applied Physics
2001 | Journal article
Contributors: Oka, H; Oka, H; Subagyo, A; Subagyo, A; Sawamura, M; Sawamura, M; Sueoka, K; Sueoka, K; Mukasa, K; Mukasa, K
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Scanning tunneling microscopy observation of epitaxial bcc-Fe(001) surface

Japanese Journal of Applied Physics
2000 | Journal article
Contributors: Subagyo, A; Oka, H; Eilers, G; Sueoka, K; Mukasa, K
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Peer review (4 reviews for 3 publications/grants)

Review activity for ACS applied nano materials. (1)
Review activity for Materials today communications. (2)
Review activity for Nature physics (1)