論文

• Kei Shigematsu, Haruki Shimizu, Marin Katsumata, Keisuke Shimizu, Hajime Yamamoto, Ko Mibu, Masaki Azuma. Stable electric polarization switching accompanied by magnetization reversal in B-site-substituted multiferroic BiFe_0.9Co_0.1O₃ thin films, APPLIED PHYSICS EXPRESS, 13, 7, June 2020.
• Hayato Ishizaki, Hajime Yamamoto, Takumi Nishikubo, Yuki Sakai, Shogo Kawaguchi, Keisuke Yokoyama, Yoichi Okimoto, Shin-ya Koshihara, Takafumi Yamamoto, Masaki Azuma. Robust Giant Tetragonal Distortion Coupled with High-Spin Co3+ in Electron-Doped BiCoO3, Inorganic Chemistry, vol. 58, p. 16059-16064, Nov. 2019.
• Blair Lebert, Hajime Yamamoto, Masaki Azuma, Rolf Heid, Satoshi Tsutsui, Hiroshi Uchiyama, Alfred Q.R Baron, Benoit Baptiste, Matteo d'Astuto. Phonon anomalies with doping in superconducting oxychlorides Ca_2-xCuO₂Cl₂, Apr. 2019.
• Takahiro Ogata, Yuki Sakai, Hajime Yamamoto, Satyanarayan Patel, Peter Keil, Jurij Koruza, Shogo Kawaguchi, Zhao Pan, Takumi Nishikubo, Jürgen Rödel, Masaki Azuma. Melting of d_xy Orbital Ordering Accompanied by Suppression of Giant Tetragonal Distortion and Insulator-to-Metal Transition in Cr-Substituted PbVO₃, Chemistry of Materials, Vol. 31, pp. 1352-1358, Jan. 2019.
• Keisuke Shimizu, Ryo Kawabe, Hajime Hojo, Haruki Shimizu, Hajime Yamamoto, Marin Katsumata, Kei Shigematsu, Ko Mibu, Yu Kumagai, Fumiyasu Oba, Masaki Azuma. Direct Observation of Magnetization Reversal by Electric Field at Room Temperature in Co-Substituted Bismuth Ferrite Thin Film, NANO LETT., Vol. 19, No. 3, pp. 1767–1773, Jan. 2019.
• Hajime Yamamoto, Takahiro Ogata, Satyanarayan Patel, Jurij Koruza, Jürgen Rödel, Atanu Paul, Tanusri Saha-Dasgupta, Yuki Sakai, Mitsuru Itoh, Masaki Azuma. Na_1/2Bi_1/2VO₃ and K_1/2Bi_1/2VO₃: New Lead-Free Tetragonal Perovskites with Moderate c/a Ratios, Chemistry of Materials, vol. 30, pp. 6728-6736, Oct. 2018.
• Hajime Hojo, Kengo Oka, Keisuke Shimizu, Hajime Yamamoto, Ryo Kawabe, Masak Azuma. Development of Bismuth Ferrite as a Piezoelectric and Multiferroic Material by Cobalt Substitution, ADVANCED MATERIALS, Vol. 30, No. 33, p. 1705665, Aug. 2018.
• Hajime Yamamoto, Takashi Imai, Yuki Sakai, Masaki Azuma. Colossal Negative Thermal Expansion in Electron-Doped PbVO₃ Perovskites, ANGEWANDTE CHEMIE-INTERNATIONAL, Vol. 57, pp. 8170-8173, July 2018.
• Zhao Pan, Xingxing Jiang, Jun Chen, Lei Hu, Hajime Yamamoto, Linxing Zhang, Longlong Fan, Xi'an Fan, Yawei Li, Guangqiang Li, Yang Ren, Zheshuai Lin, Masaki Azuma, Xianran Xing. Large spontaneous polarization in polar perovskites of PbTiO₃-Bi(Zn_1/2Ti_1/2)O-₃, Inorganic Chemistry Frontiers, Vol. 5, No. 6, pp. 1277-1281, June 2018.
• Kei Shigematsu, Takeshi Asakura, Hajime Yamamoto, Keisuke Shimizu, Marin Katsumata, Haruki Shimizu, Yuki Sakai, Hajime Hojo, Ko Mibu, Masaki Azuma. Room temperature ferromagnetism in BiFe_1-xMn_xO₃ thin film induced by spin-structure manipulation, Applied Physics Letters., Vol. 112, p. 192905, May 2018.
• H. Yamamoto, Y. Sakai, K. Shigematsu, T. Aoyama, T. Kimura, M. Azuma. Reorientation of the Magnetic Easy Plane in a Co-Substituted BiFeO₃ Single Crystal, Inorganic Chemistry, Vol. 56, No. 24, pp. 15171-15177, Dec. 2017.
• Z. Pan, J. Chen, X. X. Jiang, L. Hu, R. Z. Yu, H. Yamamoto, T. Ogata, Y. Hattori, F. M. Guo, X. A. Fan, Y. W. Li, G. Q. Li, H. Z. Gu, Y. Ren, Z. S. Lin, M. Azuma, X. R. Xing. Colossal Volume Contraction in Strong Polar Perovskites of Pb(Ti,V)O₃, Journal of the American Chemical Society, Vol. 139, No. 42, pp. 14865-14868, Oct. 2017.
• Yuki Sakai, Junye Yang, Runze Yu, Hajime Hojo, Ikuya Yamada, Ping Miao, Sanghyun Lee, Shuki Torii, Takashi Kamiyama, Marjana Ležaić, G.Bihlmayer, M. Mizumaki, J.Komiyama, T.Mizokawa, H.Yamamoto, T.Nishikubo, Y.Hattori, K. Oka, Y.Yin, J.Dai, W.Li, S.Ueda, A.Aimi, D.Mori, Y. Inaguma, Z.Hu, T. Uozumi, C.Jin, Y.Long, Masaki Azuma. A-site and B-site charge orderings in an s-d level controlled perovskite oxide PbCoO₃, Journal of the American Chemical Society, Vol. 139, No. 12, pp. 4574-4581, Mar. 2017.
• H.Hojo, R.Kawabe, K.Shimizu, H. Yamamoto, K.Mibu, K.Samanta, T.Saha-Dasgupta, M.Azuma. Ferromagnetism at Room Temperature Induced by Spin Structure Change in BiFe₁-_xCo_xO₃ Thin Films, Advanced materials, Vol. 29, No. 9, p. 1603131, Mar. 2017.
• N. Kumada, A. Nakamura, Akira Miura, T. Takei, M. Azuma, H. Yamamoto, E. Magome, C. Moriyoshi, Y. Kuroiwa. Hydrothermal synthesis and crystal structure of a new lithium copper bismuth oxide, LiCuBiO₄, Journal Of Solid State Chemistry, Vol. 245, pp. 30-33, Jan. 2017.
• Hajime Hojo, Ryo Kawabe, Keisuke Shimizu, Hajime Yamamoto, Ko Mibu, Kartik Samanta, Tanusri Saha‐Dasgupta, Masaki Azuma. Ferromagnetism at Room Temperature Induced by Spin Structure Change in BiFe₁− _xCo_xO₃ Thin Films, Advanced Materials, Vol. 29, No. 9, pp. 1603131-1～1603131-7, Dec. 2016.
• Nobuhiro Kumada, Ayumi Nakamura, Akira Miura, Takahiro Takei, Masaki Azuma, Hajime Yamamoto, Eisuke Magome, Chikako Moriyoshi, Yoshihiro Kuroiwa. Hydrothermal synthesis and crystal structure of a new lithium copper bismuth oxide, LiCuBiO 4, Journal of Solid State Chemistry, Vol. 245, pp. 30-33, Oct. 2016.
• Zhao Pan, Jun Chen, Runze Yu, Hajime Yamamoto, Yangchun Rong, Lei Hu, Qiang Li, Kun Lin, Li You, Kun Zhao, Masaki Azuma. Giant Polarization and High Temperature Monoclinic Phase in a Lead-Free Perovskite of Bi (Zn0. 5Ti0. 5) O3-BiFeO3, Inorganic Chemistry, Vol. 55, No. 19, pp. 9513-9516, Sept. 2016.
• Runze Yu, Narumi Matsuda, Ken Tominaga, Keisuke Shimizu, Hajime Hojo, Yuki Sakai, Hajime Yamamoto, Kengo Oka, Masaki Azuma. High-Temperature Monoclinic Cc Phase with Reduced c/a Ratio in Bi-based Perovskite Compound Bi₂ZnTi₁−_xMn_xO₆, Inorganic Chemistry, Vol. 55, No. 12, pp. 6124-6129, June 2016.
• Hajime Yamamoto, Takumi Kihara, Kengo Oka, Tokunaga Masashi, Ko Mibu, Masaki Azuma. Spin Structure Change in Co-Substituted BiFeO₃ , Journal of the Physical Society of Japan, Vol. 85, pp. 064704-1-4, May 2016.

国際会議発表 (査読有り)

• M. Azuma, H. Hojo, R. Kawabe, K. Shimizu, H. Yamamoto, K. Mibu, K. Samanta, T. Saha-Dasgupta. Room temperature ferromagnetism in Co substituted BiFeO₃ induced by spin structure change, Indo-US Bilateral Workshop on Physics and Chemistry of Oxides: Theory meets Experiment, Jan. 2017.

国際会議発表 (査読なし・不明)

• K. Shigematsu, T. Asakura, H. Yamamoto, K. Shimizu, M. Katsumata, H. Shimizu, Y. Sakai, H. Hojo, K. Mibu, M. Azuma. Room temperature ferromagnetism in BiFe1−xMnxO3 thin film induced by spin-structure manipulation, iLIM-3, Sept. 2018.
• Haruki Shimizu, Keisuke Shimizu, Hajime Yamamoto, Hajime Hojo, Kei Shigematsu, Masaki Azuma. Stable polarization reversal in third elements substituted multiferroic BiFe0.9Co0.1O3 thin films, The 9th APCTP Workshop on Multiferroics, Nov. 2017.
• Keisuke Shimizu, Ryo Kawabe, Hajime Yamamoto, Hajime Hojo, Kei Shigematsu, Masaki Azuma. Direct observation of magnetization reversal by polarization switching in multiferroic Co-substituted BiFeO3 thin film, The 9th APCTP Workshop on Multiferroics, Nov. 2017.

国内会議発表 (査読なし・不明)

• 清水陽樹, 清水啓佑, 山本孟, 北條元, 重松圭, 東正樹. マルチフェロイックBiFe0.9Fe0.1O3薄膜への第3元素置換, Sept. 2017.
• 浅倉 武志, 山本 孟, 清水 啓佑, 重松 圭, 北條 元, 壬生 攻, 東 正樹. BiFe1-xMn xO3のスピン構造変化, 応用物理学会, Mar. 2017.
• 浅倉武志, 山本孟, 清水啓佑, 重松圭, 北條元, 壬生攻, 東正樹. BiFe1-xMn xO3のスピン構造変化, 第55回セラミックス基礎科学討論会, Jan. 2017.

その他の論文・著書など

• 東 正樹, 山本 孟. 巨大負熱膨張への挑戦 電子ドープ強誘電体PbVO₃, 化学, Vol. 73, No. 10, pp. 68-69, Oct. 2019.
• 東 正樹, 岡 研吾, 山本 孟, 酒井 雄樹. 相転移型巨大負熱膨張物質, 応用物理, Vol. 88, No. 3, Mar. 2019.

特許など

• 東正樹, PAN ZHAO , 山本孟, Jurgen Rodel, 酒井　雄樹　. 圧電体. 特許. 公開. 国立大学法人東京工業大学, 地方独立行政法人神奈川県立産業技術総合研究所（KISTEC）. 2020/03/13. 特願2020-044500. 2021/09/24. 特開2021-143114. 2021.

学位論文

• Electronic configuration control of 3d transition metal in perovskite oxides for tuning physical properties and structural distortion,  Thesis,  Doctor (Science),  Tokyo Institute of Technology,  2018/03/26, 
• Electronic configuration control of 3d transition metal in perovskite oxides for tuning physical properties and structural distortion,  Exam Summary,  Doctor (Science),  Tokyo Institute of Technology,  2018/03/26,   
• Electronic configuration control of 3d transition metal in perovskite oxides for tuning physical properties and structural distortion,  Outline,  Doctor (Science),  Tokyo Institute of Technology,  2018/03/26,   
• Electronic configuration control of 3d transition metal in perovskite oxides for tuning physical properties and structural distortion,  Summary,  Doctor (Science),  Tokyo Institute of Technology,  2018/03/26,   

[ BibTeX 形式で保存 ]    [ 論文・著書をCSV形式で保存 ]    [ 特許をCSV形式で保存 ]