Takahito Takeda, Masahiro Suzuki, Le Duc Anh, Nguyen Thanh Tu, Thorsten Schmitt, Satoshi Yoshida, Masato Sakano, Kyoko Ishizaka, Yukiharu Takeda, Shin-ichi Fujimori, Munetoshi Seki, Hitoshi Tabata, Atsushi Fujimori, Vladimir N. Strocov, Masaaki Tanaka, and Masaki Kobayashi, “Hybridization between the ligand p band and Fe-3d orbitals in the p-type ferromagnetic semiconductor (Ga,Fe)Sb”,  Phys. Rev. B 101, 155142 (2020).

 Masahiro Sato, Yuki Imazeki, Takahito Takeda, Masaki Kobayashi, Susumu Yamamoto, Iwao Matsuda, Jun Yoshinobu, Yoshiaki Nakano, and Masakazu Sugiyama, "The Atomistic-Level Description of GaN/Water Interface by a Combined Spectroscopic and First-Principles Computational Approach", J. Phys. Chem. C 124, 12466 (2020)

Y. Fujisawa, M. Pardo-Almanza, J. Garland, K. Yamagami, X. Zhu, X. Chen, K. Araki, T. Takeda, M. Kobayashi, Y. Takeda, C. -H. Hsu, F. -C. Chuang, R. Laskowski, K. H. Khoo, A. Soumyanarayanan, and Y. Okada, "Tailoring magnetism in self-intercalated Cr_{1+δ}Te_2 epitaxial films", Phys. Rev. Mater. 4, 114001 (2020).

Takahito Takeda, Shoya Sakamoto, Kohsei Araki, Yuita Fujisawa, Le Duc Anh, Nguyen Thanh Tu, Yukiharu Takeda, Shin-ichi Fujimori, Atsushi Fujimori, Masaaki Tanaka, and Masaki Kobayashi, “Evolution of the Fe-3d impurity band state as the origin of high Curie temperature in p-type ferromagnetic semiconductor (Ga,Fe)Sb”, Phys. Rev. B 102, 245203 (2020).

K. Yamagami, Y. Fujisawa, B. Driesen, C. H. Hsu, K. Kawaguchi, H. Tanaka, T. Kondo, Y. Zhang, H. Wadati, K. Araki, T. Takeda, Y. Takeda, T. Muro, F. C. Chuang, Y. Niimi, K. Kuroda, M. Kobayashi, and Y. Okada, "Itinerant ferromagnetism mediated by giant spin polarization of the metallic ligand band in the van der Waals magnet Fe_5GeTe_2", Phys. Rev. B 103, L060403 (2021).

Y. Imazeki, M. Sato, T. Takeda, M. Kobayashi, S. Yamamoto, I. Matsuda, J. Yoshinobu, M. Sugiyama, and Y. Nakano, "Band Bending of n-GaN under Ambient H2O Vapor Studied by X-ray Photoelectron Spectroscopy", J. Phys. Chem. C 125, 9011 (2021).

N. Miyazawa, N. Usami, H. Wang, T. Kubo, H. Segawa, T. Takeda, M. Kobayashi, Y. Mita, and A. Higo, "Improvement of ZnO/Si Heterojunctions With a Coaxial Circular Transmission Line Model Applicable to Both Ohmic and Schottky", IEEE Trans. Semicond. Manuf. 34, 256 (2021). 

Hiroyasu Yamahara, Bin Feng, Munetoshi Seki, Masaki Adachi, Md Shamim Sarker, Takahito Takeda, Masaki Kobayashi, Ryo Ishikawa, Yuichi Ikuhara, Yasuo Cho, and Hitoshi Tabata, "Flexoelectric nanodomains in rare-earth iron garnet thin films under strain gradient", Communications Materials 2, 1 (2021).

Masahiro Sato, Yuki Imazeki, Takahito Takeda, Masaki Kobayashi, Susumu Yamamoto, Iwao Matsuda, Jun Yoshinobu, Yoshiaki Nakano, and Masakazu Sugiyama, "Comparative Study of H2O and O2 Adsorption on the GaN Surface", J. Phys. Chem. C 125, 25807 (2021).

Y. K. Wakabayashi, M. Kobayashi, Y. Takeda, K. Takiguchi, H. Irie, S.-I. Fujimori, T. Takeda, R. Okano, Y. Krockenberger, Y. Taniyasu, and H. Yamamoto, "Single-domain perpendicular magnetization induced by the coherent O  2p -Ru  4d  hybridized state in an ultra-high-quality  SrRuO3  film", Phys. Rev. Mater. 5, 124403 (2021).

M. Suzuki, B. Gao, G. Shibata, S. Sakamoto, Y. Nonaka, K. Ikeda, Z. Chi, Y.-X. Wan, T. Takeda, Y. Takeda, T. Koide, A. Tanaka, M. Kobayashi, S.-W. Cheong, and A. Fujimori, "Magnetic anisotropy of the van der Waals ferromagnet Cr2Ge2Te6 studied by angular-dependent x-ray magnetic circular dichroism",  Phys. Rev. Research, 4, 013139 (2022).

Takahito Takeda, Shoya Sakamoto, Le Duc Anh, Yukiharu Takeda, Shin-ichi Fujimori, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Atsushi Fujimori, Masaaki Tanaka, and Masaki Kobayashi, "Development of magnetism in Fe-doped magnetic semiconductors: Resonant photoemission and x-ray magnetic circular dichroism studies of (Ga,Fe)As",  Phys. Rev. B 105, 195155 (2022).

M. Kobayashi, N. H. D. Khang, T. Takeda, K. Araki, R. Okano, M. Suzuki, K. Kuroda, K. Yaji, K. Sugawara, S. Souma, K. Nakayama, K. Yamauchi, M. Kitamura, K. Horiba, A. Fujimori, T. Sato, S. Shin, M. Tanaka, P. N. Hai, "Rhombic Fermi surfaces in a ferromagnetic MnGa thin film with perpendicular magnetic anisotropy",  Phys. Rev. Mater. 6, 074403 (2022).

Y. K. Wakabayashi, M. Kobayashi, Y. Takeda, M. Kitamura, T. Takeda, R. Okano, Y. Krockenberger, Y. Taniyasu, H. Yamamoto, "Isotropic orbital magnetic moments in magnetically anisotropic SrRuO3 films", Phys. Rev. Mater. 6, 094402 (2022).

A. Kobayashi, S. Kihira, T. Takeda, M. Kobayashi, T. Harada, K. Ueno, H. Fujioka, "Crystal-Phase Controlled Epitaxial Growth of NbNx Superconductors on Wide-Bandgap AlN Semiconductors", Adv. Mater. Interfaces , 2201244 (2022).

Ryo Okano, Tomoki Hotta, Takahito Takeda, Kohsei Araki, Kengo Takase, Shoya Sakamoto, Yukiharu Takeda, Atsushi Fujimori, Masaaki Tanaka, Masaki Kobayashi, "Ferromagnetism induced by hybridization of Fe 3d  orbitals with ligand InSb bands in the n-type ferromagnetic semiconductor (In,Fe)Sb", Phys. Rev. B 107, 205205 (2023).

Le Duc Anh, Masaki Kobayashi, Takahito Takeda, Kohsei Araki, Ryo Okano, Toshihide Sumi, Masafumi Horio, Kohei Yamamoto, Yuya Kubota, Shigeki Owada, Makina Yabashi, Iwao Matsuda, Masaaki Tanaka, "Ultrafast Subpicosecond Magnetisation Of a Two‐Dimensional Ferromagnet", Adv. Mater. 2301347 (2023).  

Takahito Takeda, Kengo Takase, Vladimir N. Strocov, Masaaki Tanaka, Masaki Kobayashi, "Identification of electronic dimensionality reduction in semiconductor quantum well structures", J. Electron Spectrosc. Relat. Phenom.  270, 147406 (2024).

Kohdai Inagaki, Keita Ishihara, Tomoki Hotta, Yuichi Seki, Takahito Takeda, Tatsuhiro Ishida, Daiki Ootsuki, Ikuto Kawasaki, Shin-ichi Fujimori, Masaaki Tanaka, Le Duc Anh, Masaki Kobayashi, "Allotropic transition of Dirac semimetal α-Sn to superconductor β-Sn induced by irradiation of focused ion beam",  Appl. Phys. Lett. 124, 021602 (2024).

Shinobu Ohya, Shun Tsuruoka, Masaya Kaneda, Takahito Takeda, Yuriko Tadano, Tatsuro Endo, Le Duc Anh, Tetsuya Fukushima,Hikari Shinya, Akira Masago, Hiroshi Katayama-Yoshida,and Masaaki Tanaka, "Colossal magnetoresistive switching induced by d0 ferromagnetism of MgO in a semiconductor nanochannel device with ferromagnetic Fe/MgO electrodes", Adv. Mater. 36, 2307389 (2024).

Takahito Takeda, Takuma Arai, Kohei Yamagami, Le Duc Anh, Masaaki Tanaka, Masaki Kobayashi, Shinobu Ohya, "Mechanism of ferromagnetism enhancement in a La2/3 Sr1/3 MnO3 membrane released from epitaxial strain", Phys. Rev. Mater. 8, 054415 (2024).

Yuki K Wakabayashi, Masaki Kobayashi, Yuichi Seki, Kohei Yamagami, Takahito Takeda, Takuo Ohkochi, Yoshitaka Taniyasu, Yoshiharu Krockenberger, Hideki Yamamoto, "SrRuO3 under tensile strain: Thickness-dependent electronic and magnetic properties", J. Appl. Phys. 136, 043907 (2024).

Masaya Kaneda, Shun Tsuruoka, Hikari Shinya, Tetsuya Fukushima, Tatsuro Endo, Yuriko Tadano, Takahito Takeda, Akira Masago, Masaaki Tanaka, Hiroshi Katayama‐Yoshida, Shinobu Ohya, "Giant memory function based on the magnetic field history of resistive switching under a constant bias voltage", Adv. Funct. Mater. 35, 2415648 (2025).

Haining Li, Masaki Kobayashi, Sonju Kou, Md Shamim Sarker, EMK Ikball Ahamed, Kohei Yamagami, Tetsuya Fukushima, Kaijie Ma, Shuting Ma, Takahito Takeda, Ryo Okano, M Hussein N Assadi, Hiroyasu Yamahara, Hiroshi Katayama‐Yoshida, Hitoshi Tabata, Munetoshi Seki, "Noncollinear Magnetism in Fe3O4 Induced via Site‐Selective Rare‐Earth Substitution Boosting Its Saturation Magnetization", Small 2411133 (2025).

Yuki K Wakabayashi, Masaki Kobayashi, Yoshiharu Krockenberger, Takahito Takeda, Kohei Yamagami, Hideki Yamamoto, Yoshitaka Taniyasu, "Single monolayer ferromagnetic perovskite SrRuO3 with high conductivity and strong ferromagnetism", Appl. Phys. Lett. 127, 022402 (2025).

Yuichi Seki, Yuki K Wakabayashi, Takahito Takeda, Kohdai Inagaki, Shin-ichi Fujimori, Yukiharu Takeda, Atsushi Fujimori, Yoshitaka Taniyasu, Hideki Yamamoto, Yoshiharu Krockenberger, Masaaki Tanaka, Masaki Kobayashi, "Correlated Ligand Electrons in the Transition-Metal Oxide SrRuO3",  Phys. Rev. Lett. 135, 046402 (2025).

Yuita Fujisawa, Anjana Krishnadas, Chia-Hsiu Hsu, Takahito Takeda, Sheng Liu, Markel Pardo-Almanza, Yukiko Obata, Dyon van Dinter, Kohei Yamagami, Guoqing Chang, Masaki Kobayashi, Chang-Yang Kuo, Yoshinori Okada, "Imaging emergent exotic quasiparticle state in a frustrated transition metal oxide",  arXiv:2306.06708 [cond-mat.supr-con].

Takahito Takeda, Karumuri Sriharsha, Seiji Aota, Ryo Okano, Le Duc Anh, Yukiharu Takeda, Akira Yasui, Miho Kitamura, Yuki K Wakabayashi, Atsushi Fujimori, Masaaki Tanaka, and Masaki Kobayashi, "Magnetic anisotropy related to hybridization between Fe 3 and As 4 orbitals in a bcc Fe-As thin film", arXiv:2505.05924 [cond-mat.mtrl-sci].

Takahito Takeda,  日本放射光学会 第 6 回若手有志研究会, オンライン, March 2022.

Takahito Takeda, Takuma Arai, Daigo Matsubara, Kohei Yamagami, Le Duc Anh, Masaaki Tanaka, Masaki Kobayashi, and Shinobu Ohya, “Mechanism of the Enhanced Ferromagnetism in a La2/3Sr1/3MnO3 Membrane studied bySynchrotron Radiation Spectroscopy”, IWOE 31, Banff, September 2025.

Takahito Takeda,  Masahiro Suzuki, Le Duc Anh, Nguyen Thanh Tu, Thorsten Schmitt, Satoshi Yoshida, Masato Sakano, Kyoko Ishizaka, Yukiharu Takeda, Shin-ichi Fujimori, Munetoshi Seki, Hitoshi Tabata, Atsushi Fujimori, Vladimir N. Strocov, Masaaki Tanaka, and Masaki Kobayashi, “Electronic structure of p-type ferromagnetic semiconductor (Ga,Fe)Sb: Valence band and impurity band”, IMR-MAX IV joint research, Miyagi, January 2020.

K. Yamagami, Y. Fujisawa, B. Driesen, C. H. Hsu, K. Kawaguchi, H. Tanaka, T. Kondo, Y. Zhang, H. Wadati, K. Araki, T. Takeda, Y. Takeda, T. Muro, F. C. Chuang, Y. Niimi, K. Kuroda, M. Kobayashi, and Y. Okada, "Itinerant ferromagnetism mediated by giant spin polarization of the metallic ligand band in the van der Waals magnet Fe_5GeTe_2", APS March Meeting 2021.

Y. Fujisawa, M. Pardo-Almanza, J. Garland, K. Yamagami, X. Zhu, X. Chen, K. Araki, T. Takeda, M. Kobayashi, Y. Takeda, C. -H. Hsu, F. -C. Chuang, R. Laskowski, K. H. Khoo, A. Soumyanarayanan, and Y. Okada, "Tailoring magnetism in self-intercalated Cr_{1+δ}Te_2 epitaxial films", APS March Meeting 2021.

Takahito Takeda, Shoya Sakamoto, Le Duc Anh, Yukiharu Takeda, Shin-ichi Fujimori, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Atsushi Fujimori, Masaaki Tanaka, and Masaki Kobayashi, "Onset of ferromagnetism in Fe-doped magnetic semiconductors depending on the occupation of the impurity band by electrons", EP2DS-24/MSS-20, November 2021. 

 Takahito Takeda, Masahiro Suzuki, Le Duc Anh, Yosuke Nonaka, Thorsten Schmitt, Satoshi Yoshida, Masato Sakano, Kyoko Ishizaka, Yukiharu Takeda, Shin-ichi Fujimori, Munetoshi Seki, Hitoshi Tabata, Atsushi Fujimori, Vladimir N. Strocov, Masaaki Tanaka, and Masaki Kobayashi, “Electronic structure of p-type ferromagnetic semiconductor (Ga,Fe)Sb: Valence band and impurity band”, Japan Society of Applied Physics, Tokyo, March 2019.

Takahito Takeda, Masahiro Suzuki, Le Duc Anh, Yosuke Nonaka, Thorsten Schmitt, Satoshi Yoshida, Masato Sakano, Kyoko Ishizaka, Yukiharu Takeda, Shin-ichi Fujimori, Munetoshi Seki, Hitoshi Tabata, Atsushi Fujimori, Vladimir N. Strocov, Masaaki Tanaka, and Masaki Kobayashi, “Valence-band struc- ture and impurity bandof p-type ferromagnetic semiconductor (Ga,Fe)Sb”, The Physical Society of Japan, Fukuoka, March 2019.

Takahito Takeda, Kohsei Araki, Yuita Fujisawa, Le Duc Anh, Nguyen Thanh Tu, Yukiharu Takeda, Shin-ichi Fujimori, Atsushi Fujimori, Masaaki Tanaka, and Masaki Kobayashi, “Fe concentration dependence of the Fe 3d electronic states in p-type ferromagnetic semiconductor (Ga1−x,Fex)Sb”, Japan Society of Applied Physics, Tokyo, March 2020.

Takahito Takeda, Kengo Takase, Kohsei Araki, Thorsten Schmitt, Vladimir N. Strocov, Masaaki Tanaka, and Masaki Kobayashi, “Dimensionality reduction in the valence-band structure of a III-V semiconductor InSb ultra- thin film”, The Physical Society of Japan, Aichi, March 2020.

K. Yamagami, B. Driesen, Y. Fujisawa, C. H. Hsu, K. Kawaguchi, H. Tanaka, K. Kuroda, T. Kondo, Y. Zhang, H. Wadati, K. Araki, T. Takeda, M. Kobayashi, Y. Takeda, T. Muro, F. C. Chuang, and Y. Okada, “Hybridization driven magnetic polarization of ligand states in van der Waals ferromagnet Fe5GeTe2 observed by soft X-ray magnetic circular dichroism”, The Physical Society of Japan, September 2020. 

Le Duc Anh, Masaki Kobayashi, Takahito Takeda, Kohsei Araki, Ryo Okano, Toshihide Sumi, Masafumi Horio, Kohei Yamamoto, Yuya Kubota, Shigeki Owada, Makina Yabashi, Iwao Matsuda, and Masaaki Tanaka, “Ultrafast enhancement of magnetization in ferromagnetic semiconductor (In,Fe)As quantum wells”, Japan Society of Applied Physics, March 2021. 

Takahito Takeda, Shoya Sakamoto, Le Duc Anh, Yukiharu Takeda, Shin-ichi Fujimori, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Atsushi Fujimori, Masaaki Tanaka, and Masaki Kobayashi, "Onset of ferromagnetism in Fe-doped magnetic semiconductors depending on the electron occupation of the impurity band", Japan Society of Applied Physics, September 2021. 

Ryo Okano, Tomoki Hotta, Takahito Takeda, Kohsei Araki, Kengo Takase, Le Duc Anh, Shoya Sakamoto, Yukiharu Takeda, Atsushi Fujimori, Masaaki Tanaka, and Masaki Kobayashi, "Orbital hybridization of Fe 3d orbitals with the host InSb bands in n-type ferromagnetic semiconductor (In,Fe)Sb", Japan Society of Applied Physics, September 2021. 

Masaki Kobayashi,  N. H. D. Khang, Takahito Takeda, Kohsei Araki, Ryo Okano, Masahiro Suzuki, Kenta Kuroda, Koichiro Yaji, Katsuaki Sugawara, Seigo Souma, Kosuke Nakayama, Miho Kitamura, Koji Horiba, Atsushi Fujimori, Takafumi Sato, Shik Shin, Masaaki Tanaka, and Pham Nam Hai, "Two-dimensional Electronic State in a Ferromagnetic L10 MnGa Thin Film with Perpendicular Magnetization", Japan Society of Applied Physics, September 2021. 

若林 勇希, 小林 正起, 竹田 幸治, 瀧口 耕介, 入江 宏, 藤森 伸一, 武田 崇仁, 岡野 諒, ヨシハル クロッケンバーガー, 谷保 芳孝, 山本 秀樹, "超高品質SrRuO3薄膜における強い軌道混成と単一ドメイン垂直磁化", Japan Society of Applied Physics, September 2021. 

武田 崇仁, 坂本 祥哉, レ デゥック アイン, 竹田 幸治,  藤森 伸一, 北村 未歩, 堀場 弘司, 組頭 広志, 藤森 淳, 田中 雅明, 小林 正起, "鉄添加III-V族磁性半導体における強磁性発現条件の解明", The Physical Society of Japan, March 2022.

 小林 正起, N. H. D. Khang, 武田 崇仁, 荒木 恒星, 岡野 諒, 鈴木 雅弘, 黒田 健太, 矢治 光一郎, 菅原 克明, 相馬 清吾, 中山 耕輔, 山内 邦彦, 北村 未歩, 堀場 弘司, 藤森 淳, 佐藤 宇史, 辛 埴, 田中 雅明, P. N. Hai, "L10-MnGa垂直直膜における電子状態観測", The Physical Society of Japan, March 2022.

武田 崇仁,  高瀬 健吾, V. N. Strocov, 田中 雅明, 小林 正起, "III-V族化合物半導体InSb極薄膜における価電子帯の低次 元化", Japan Society of Applied Physics, September 2022. 

小林 篤 , 紀平 俊矢, 武田 崇仁, 小林 正起, 秋山 亨, 河村 貴宏, 原田 尚之, 上野 耕平, 藤岡 洋, "AlNに格子整合する六方晶Nb2N超伝導体のエピタキ シャル成長", Japan Society of Applied Physics, September 2022. 

若林 勇希, 小林 正起, 竹田 幸治, 北村 未歩, 武田 崇仁, 岡野 諒, ヨシハル クロッケンバーガー, 谷保 芳孝, 山本 秀樹, "磁気異方性を持つSrRuO3薄膜における等方的な軌道磁気モーメント", Japan Society of Applied Physics, September 2022.