筆頭論文：25本、責任論文：38本

[73] Y. Liu, B. Chen, Binjie, Y. Hamasaki, L. Gong, H. Ohta, T. Katayama*, “Magnetic phase transition-induced modulation of ferroelectric properties in hexagonal RFeO₃ (R = Tb and Ho)” ACS Appl. Mater. Interfaces 16, 14, 17832 (2024).

[72] L. Gong, A. Taguchi, W. Zhou, R. Mitsuya, H. Ohta, T. Katayama*, “Ferroelectric BaTiO₃ Freestanding Sheets for Ultra-High-Speed Light-Driven Actuator” ACS Appl. Mater. Interfaces 16, 54146 (2024).

[71] T. Katayama*, K. Magara, S. Sakai, Y. Zeng, A. Chikamatsu, T. Hasegawa, “Cation-placement control in double-perovskite GdBaCo₂O₆ and its impact on magnetism via spin-state modification” J. Mater. Chem. C 12, 10428 (2024).

[70] B. Chen, J. Lin, B. Feng, Y. Ikuhara, H. Ohta, T. Katayama*, “Unusual crystal orientation in hexagonal HoFeO₃ multiferroic films and the effect on magnetism” Chen, J. Lin, B. Feng, Y. Ikuhara, H. Ohta, T. Katayama*, Cryst. Growth Des. 24, 839 (2024).

[69] L. Gong, K. Marunouchi, A. Chikamatsu, H. Ohta, T. Katayama*, “Large tensile-strained BaTiO₃ films grown on lattice-mismatched La-doped BaSnO₃ bottom electrode” CrystEngComm 26, 2765 (2024).

[68] M. Sano, A. Kamigaito, Y. Wakayama, K. Shigematsu, T. Katayama, Y. Hirose, A. Chikamatsu, “Topochemical fluorination of epitaxial thin films of barium-doped bismuth iron oxyfluoride” Cryst. Growth Des. in press

[67] K. Marunouchi, L. Gong, H. Ohta, T. Katayama*, “High-concentration doping effects of aliovalent Al and Ga on ferroelectric properties of BaTiO₃ Films” Thin Solid Films 796, 140339 (2024).

[66] T. Katayama*, S. Mo, A. Chikamatsu, Y. Kurauchi, H. Kumigashira, and T. Hasegawa, “Half-metallicity and magnetic anisotropy in double-perovskite GdBaCo₂O₆ films prepared via topotactic oxidation” Chem. Mater. 35, 1295 (2023).

[65] T. Katayama*, K. Magara, A. Chikamatsu, and T. Hasegawa, “Anisotropic proton conduction in double-perovskite GdBaCo₂O₅” Appl. Phys. Lett. 123, 012902 (2023).

[64] S. Mo, T. Katayama*, A. Chikamatsu, and T. Hasegawa,“Grain engineered polar-axis-oriented epitaxial Mn₂Mo₃O₈ films with enhanced magnetic transition temperature” J. Mater. Chem. C 11, 7427 (2023).

[63] R. Yu, L. Gong, H. Ohta, and T. Katayama*, “Ferroelectricity, high permittivity, and tunability in millimeter-size crack-free Ba_1–xSr_xTiO₃ flexible epitaxial sheets” ACS Appl. Electron. Mater. 5, 9, 5234 (2023).

[62] B. Chen, and T. Katayama*, “Hexagonal RFeO₃ (R = Dy, Er, and Lu) films grown on glass substrates with both magnetic and ferroelectric orders” ACS Appl. Electron. Mater. 5, 1, 344 (2023).

[61] L. Gong, R. Yu, H. Ohta, and T. Katayama*, “Synthesis and transparent conductivity of crack-free La:BaSnO₃ epitaxial flexible sheets” Dalton Trans. 52, 6317 (2023).

[60] A. Nishida, T. Katayama, Y. Matsuo, “Atomic layer deposition of HfO₂ films using tetrakis(1-(N,N-dimethylamino)-2-propoxy)hafnium [Hf(dmap)₄] for advanced gate dielectrics applications” ACS Appl. Nano Mater. in press.

[59] A. Nishida, T. Katayama, Y. Matsuo, “Atomic layer deposition of Y₂O₃ films using novel liquid homoleptic yttrium precursor tris(sec-butylcyclopentadienyl)yttrium [Y(sBuCp)₃] and Water” RSC Adv. 13, 27255 (2023).

[58] T. Katayama*, S. Mo, A. Chikamatsu, and T. Hasegawa, “Solid phase epitaxy of perpendicular magnetic BaFe₁₂O₁₉ flexible sheets on mica substrate” Jpn. J. Appl. Phys. 62 065505 (2023).

[57] L. Gong, M. Wei, R. Yu, H. Ohta, and T. Katayama*, “Significant suppression of cracks in freestanding perovskite oxide flexible sheets using a capping oxide layer” ACS Nano 16, 12, 21013 (2022).

[56] T. Nishimura, T. Katayama*, S. Mo, A. Chikamatsu, and T. Hasegawa, “Improvement of electric insulation in dielectric layered perovskite nickelate films via fluorination”, J. Mater. Chem. C 10, 1711 (2022).

[55] B. Chen, T. Hasegawa, H. Ohta, and T. Katayama*, “Antiferroelectric-to-ferroelectric phase transition in hexagonal rare-earth iron oxides”, J. Mater. Chem. C 10, 5621 (2022).

[54] Y. Zhang, T. Katayama, A. Chikamatsu, C. Schubler-Langeheine, N. Pontius, Y. Hirata, K. Takubo, K. Yamagami, K. Ikeda, K. Yamamoto, T. Hasegawa, and H. Wadati, “Photo-induced Antiferromagnetic-ferromagnetic and Spin-state Transition in GdBaCo₂O₅ Thin Film”, Commun. Phys. 5, 50 (2022).

[53] B. Chen, H. Ohta, and T. Katayama*, “Ferroelectric and magnetic properties of hexagonal ErFeO₃ epitaxial films”, ACS Appl. Electron. Mater. 4, 4547 (2022).

[52] T. Maruyama, Y. Hirose, T. Katayama, Y. Sugisawa, D. Sekiba, T. Hasegawa, and A. Chikamatsu, “Negative magnetoresistance in different nitrogen content EuNbO_3-xN_x single-crystalline thin films”, J. Mater. Chem. C 10, 14661 (2022).

[51] S. Fukuma, A. Chikamatsu, T. Katayama, T. Maruyama, K. Yanagisawa, K. Kimoto, M. Kitamura, K. Horiba, H. Kumigashira, Y. Hirose, and T. Hasegawa, “Crystal structure and electronic property modification of Ca₂RuO₄ thin films via fluorine doping”, Phys. Rev. Mater. 6, 035002 (2022).

[50] J. Kasahara, T. Katayama*, A. Chikamatsu, Y. Hamasaki and T. Hasegawa, “Epitaxial growth of hexagonal GdFeO₃ thin films with magnetic order by pulsed laser deposition”, Thin Solid Films 757, 139409 (2022).

[49] T. Katayama*, A. Chikamatsu, and T. Hasegawa, “Ionic order and magnetic properties of double-perovskite GdBaCo₂O₅ films on SrTiO₃ substrates”, J. Ceram. Soc. Jpn. 130, 429 (2022).

[48] Wang, T. Katayama*, C. Wang, Q. Li, Y. shi, Y. Fang, F. Huang, Y. Zhu, H. Li, S. Yasui, X. Huang and J. Yu, “Enhancement of room-temperature magnetization in GaFeO₃-type single crystals by Al and Sc doping”, AIP Adv. 12, 065015 (2022).

[47] T. Katayama*, A. Chikamatsu, Y. Zhang, S. Yasui, H. Wadati and T. Hasegawa, “Ionic-order engineering in double-perovskite cobaltite”, Chem. Mater. 33, 5675 (2021).

[46] S. Mo, T. Katayama*, A. Chikamatsu, M. Kitamura, K. Horiba, H. Kumigashira, T. Hasegawa, “Epitaxial-strain-induced spontaneous magnetization in polar Mn₂Mo₃O₈”  Chem. Mater. 33, 7713 (2021).

[45] J. Kasahara, T. Katayama*, S. Mo, A. Chikamatsu, Y. Hamasaki, S. Yasui, M. Itoh, and T. Hasegawa, “Room-temperature antiferroelectricity in multiferroic hexagonal rare-earth ferrites”, ACS Appl. Mater. Interfaces 13, 4230 (2021).

[44] T. Katayama*, S. Mo, Y. Kurauchi, A. Chikamatsu and T. Hasegawa, “Synthesis and Magnetism of MoCo₂O₄ Spinel Thin Films”, Thin Solid Films 728, 138696 (2021).

[43] A. Chikamatsu, T. Katayama, T. Maruyama, M. Kitamura, K. Horiba, H. Kumigashira, H. Wadati, and T. Hasegawa, “Investigation of the electronic states of A-site layer-ordered double perovskite YBaCo₂O_x (x = 5.3 and 6) thin films by X-ray spectroscopy”, Appl. Phys. Lett. 118, 012401 (2021).

[42] Y. Hamasaki, S. Yasui, T. Katayama, T. Kiguchi, S. Sawai and M. Itoh, “Ferroelectric and magnetic properties in ε-Fe2O3 epitaxial film”, Appl. Phys. Lett. in press.

[41] Y. Zhang, H. Wang, K. Tachiyama, T. Katayama*, Y. Zhu, S. Wu, H. Li, J. Fang, Q. Li, Y. Shi, L. Wang, Z. Fu, F. Xu, J. Yu, S. Yasui, and M. Itoh, “Single-crystal synthesis of ε-Fe₂O₃-type oxides exhibiting room-temperature ferrimagnetism and ferroelectric polarization”, Cryst. Growth Des. 21, 4904 (2021).

[40] H. Wang, Y. Zhang, K. Tachiyama, Z. Xia, J. Fang, Q. Li, G. Cheng, Y. Shi, J. Yu, T. Katayama, S. Yasui, M. Itoh, “Large polarization switching and high-temperature magnetoelectric coupling in multiferroic GaFeO₃ systems”, Inorg. Chem. 60, 1, 225 (2021).

[39] K. Gu, T. Katayama*, S. Yasui, A. Chikamatsu, S. Yasuhara, M. Itoh, and T. Hasegawa, “Simple method to obtain large-size single-crystalline oxide sheets”, Adv. Funct. Mater. 30, 2001236 (2020).

[38] Y. Hamasaki, T. Katayama, S. Yasui, T. Shiraishi, A. Akama, T. Kiguchi, T. Taniyama, and M. Itoh, “Switchable third ScFeO₃ polar ferromagnet with YMnO₃-type structure”, J. Mater. Chem. C 8, 4447 (2020).

[37] T. Maruyama, A. Chikamatsu, T. Katayama, K. Kuramochi, H. Ogino, M. Kitamura, K. Horiba, H. Kumigashira, and T. Hasegawa, “Influence of fluorination on electronic states and electron transport properties of Sr₂IrO₄ thin films”, J. Mater. Chem. C 8, 8268 (2020).

[36] B. N. Rao, S. Yasui, T. Katayama, A. Taguchi, H. Moriwake, Y. Hamasaki, and M. Itoh, “Investigation of ferrimagnetism and ferroelectricity in Al_xFe_2-xO₃ thin films”, J. Mater. Chem. C 8, 706 (2020).

[35] S. Yasuhra, Y. Hamasaki, T. Katayama, T. Ao, Y. Inaguma, H. Hojo, M. Karppinen, A. Philip, S. Yasui, and M. Itoh, “Modulating the Structure and Magnetic Properties of ε-Fe₂O₃Nanoparticles via Electrochemical Li⁺ Insertion”, Inorg. Chem. 59, 7, 4357 (2020).

[34] A. Chikamatsu, T. Maruyama, T. Katayama, Y. Su, Y. Tsujimoto, K. Yamaura, M. Kitamura, K. Horiba, H. Kumigashira, and T. Hasegawa, “Electronic properties of perovskite strontium chromium oxyfluoride epitaxial thin films fabricated via low-temperature topotactic reaction”, Phys. Rev. Mater. 4, 025004 (2020).

[33] B. N. Rao, S. Yasui, Y. Han, Y. Hamasaki, T. Katayama, T. Shirashi, T. Kiguchi, and M. Itoh, “Redox-based multilevel resistive switching in AlFeO₃ thin-film heterostructures”, ACS Appl. Electron. Mater. 2, 4, 1065 (2020).

[32] T. Katayama*, S. Mo, T. Maruyama, A. Chikamatsu, and T. Hasegawa, “Reactive Solid Phase Epitaxy of Layered Aurivillius-type Oxyfluorides Bi₂TiO₄F₂ using Polyvinylidene Fluoride”, Dalton Trans. 48, 5425 (2019).

[31] T. Katayama*, Y. Kurauchi, S. Mo, K. Gu, A. Chikamatsu, and T. Hasegawa, “p-type conductivity and room-temperature ferrimagnetism in spinel MoFe₂O₄ epitaxial thin film”, Cryst. Growth Des. 19, 902 (2019).

[30] T. Katayama*, A. Chikamatsu, H. Kumigashira, and T. Hasegawa, “Improved crystalline quality and electric conductivity in infinite-layer SrFeO₂ films through Sm substitution”, Appl. Phys. Lett. 114, 232906 (2019).

[29] Y. Kurauchi, T. Katayama*, A. Chikamatsu, T. Hasegawa, “Two-dimensional fluorine distribution in a heavily distorted perovskite nickel oxyfluoride revealed by first-principles calculation”, J. Phys. Chem. C 123, 31190 (2019).

[28] S. Mo, Y. Kurauchi, T. Katayama*, Y. Hirose, and T. Hasegawa, “Theoretical investigation of the role of the nitride Ion in the magnetism of oxynitride MnTaO₂N”, J. Phys. Chem. C 123, 25379 (2019).

[27] A. Chikamatsu, Y. Suzuki, T. Maruyama, T. Onozuka, T. Katayama, D. Ogawa, and T. Hasegawa, “Selective fluorination of perovskite iron oxide/ruthenium oxide heterostructures via a topotactic reaction”, Chem. Commun. 55, 2437 (2019).

[26] S. Yasui, T. Katayama, T. Osakabe, Y. Hamasaki, T. Taniyama, and M. Itoh, “Ferroelectric and Ferrimagnetic properties of ε-Rh_xFe_2-xO₃ thin films”, J. Ceram. Soc. Jpn. 127, 474 (2019).

[25] K. Tachiyama, S. Yasui, B. N. A. Rao, T. Dazai, T. Usami, T. Taniyama, T. Katayama, Y. Hamasaki, J. Yu, H. He, H. Wang, and M. Itoh, “Magnetic Properties of Single Crystal GaFeO₃”, MRS Adv. 4, 61 (2019).

[24] . N. A. Rao, S. Yasui, T. Katayama, and M. Itoh, “Fabrication and Characterization of Multiferroic Al₅Fe_1.5O₃ Epitaxial Thin Films”, MRS Adv. 4, 539 (2019).

[23] M. Zhang, S. Yasui, T. Katayama, B. N. Rao, H. Wen, X. Pan, M. Tang, F. Ai, and M. Itoh, “Epitaxial Growth of Orthorhombic GaFeO₃Thin Films on SrTiO₃(111) Substrates by Simple Sol-gel Method”, Materials 12, 254 (2019).

[22] T. Katayama*, S. Yasui, Y. Hamasaki, T. Shiraishi, A. Akama, T. Kiguchi, and M. Itoh, “Ferroelectric and magnetic properties in room-temperature multiferroic Ga_xFe_2-xO₃ epitaxial thin films”, Adv. Funct. Mater. 28, 1704789 (2018).

[21] T. Katayama*, S. Yasui, T. Osakabe, Y. Hamasaki, and M. Itoh, “Ferrimagnetism and ferroelectricity in Cr-substituted GaFeO₃ epitaxial films”, Chem. Mater. 30, 1436 (2018).

[20] T. Katayama, A. Chikamatsu, Y. Hirose, M. Minohara, H. Kumigashira, I. Harayama, D. Sekiba, and T. Hasegawa, “Ferromagnetism with strong magnetocrystalline anisotropy in A-site ordered perovskite YBaCo₂O₆ epitaxial thin film prepared via wet-chemical topotactic oxidation”, J. Mater. Chem. C 6, 3445 (2018).

[19] T. Katayama*, T. Osakabe, S. Yasui, Y. Hamasaki, B. N. Rao, M. Zhang, and M. Itoh, “Effect of Cr Substitution on Ferrimagnetic and Ferroelectric Properties of GaFeO₃ Epitaxial Thin Films”,  Appl. Phys. Lett. 113, 162901 (2018).

[18] A. Chikamatsu, K. Kawahara, T. Shiina, T. Onozuka, T. Katayama, T. Hasegawa, “Fabrication of fluorite-type fluoride Ba₅Bi_0.5F_2.5 thin films by fluorination of perovskite BaBiO₃ precursors with polyvinylidene fluoride”,  ACS Omega 3, 13141 (2018).

[17] T. Katayama*, S. Yasui, Y. Hamasaki, T. Osakabe, and M. Itoh, “Chemical tuning of room-temperature ferrimagnetism and ferroelectricity in ε-Fe₂O₃-type multiferroic oxide thin films”, J. Mater. Chem. C 5, 12597 (2017).

[16] T. Katayama*, S. Yasui, Y. Hamasaki, and M. Itoh, “Control of crystal-domain orientation in multiferroic Ga₆Fe_1.4O₃ epitaxial thin films”, Appl. Phys. Lett. 110, 212905 (2017).

[15] T. Onozuka, A. Chikamatsu, T. Katayama, Y. Hirose, I. Harayama, D. Sekiba, E. Ikenaga, M. Minohara, H. Kumigashira, and T. Hasegawa, “Reversible changes in resistance of perovskite nickelate NdNiO₃ thin films induced by fluorine substitution”, ACS Appl. Mater. Interfaces9, 10882 (2017).

[14] K. Kawahara, A. Chikamatsu, T. Katayama, T. Onozuka, D. Ogawa, K. Morikawa, E. Ikenaga, Y. Hirose, I. Harayama, D. Sekiba, T. Fukumura, and T. Hasegawa, “Topotactic fluorination of perovskite strontium ruthenate thin films using polyvinylidene fluoride”,  CrystEngComm 19, 313 (2017).

[13] Y. Kurauchi, H. Kamisaka, T. Katayama, A. Chikamatsu, T. Hasegawa, “First-principles calculations on the crystal/electronic structure and phase stability of H-doped SrFeO₂”, J. Phys. Chem. C 121, 7478 (2017).

[12] T. Katayama*, Y. Hamasaki, S. Yasui, A. Miyahara, M. Itoh, “Epitaxial thin film growth of garnet-, GdFeO₃-, and YMnO₃-type LuFeO₃ using pulsed laser deposition”, Thin Solid Films 642, 41 (2017).

[11] T. Katayama*, S. Yasui, Y. Hamasaki, and M. Itoh, “Electric transport characteristics of gallium iron oxide epitaxial thin film”, MRS Adv. 2, 3459 (2017).

[10] T. Onozuka, A. Chikamatsu, T. Katayama, T. Fukumura and T. Hasegawa, “Formation of defect-fluorite structured NdNiO_xH_y epitaxial thin films via soft chemical route from NdNiO₃ precursor”, Dalton Trans. 45, 12114 (2016).

[9] T. Katayama, A. Chikamatsu, H. Kamisaka, H. Kumigashira, and T. Hasegawa, “Experimental and theoretical investigation of electronic structure of SrFeO_3-xF_x epitaxial thin films prepared via topotactic reaction”,  Appl. Phys. Express 9, 025801 (2016). (Selected as Spotlight)

[8] T. Katayama, A. Chikamatsu, K. Yamada, K. Shigematsu, T. Onozuka, M. Minohara, H. Kumigashira, E. Ikenaga, and T. Hasegawa, “Epitaxial growth and electronic structure of oxyhydride SrVO₂H thin films”, J. Appl. Phys. 120, 085305 (2016).

[7] T. Katayama, A. Chikamatsu, T. Fukumura, and T. Hasegawa, “Topotactic reductive synthesis of A-site cation-ordered perovskite YBaCo₂O_x (x = 4.5−5.5) epitaxial thin films”, Jpn. J. Appl. Phys. 55, 04EJ05 (2016).

[6] K. Kurita, A. Chikamatsu, K. Shigematsu, T. Katayama, H. Kumigashira, T. Fukumura, T. Hasegawa, “Effects of Cr substitution on the magnetic and transport properties and electronic states of SrRuO₃ epitaxial thin films”, Phys. Rev. B 92, 115153 (2015).

[5] T. Katayama, A. Chikamatsu, Y. Hirose, T. Fukumura, and T. Hasegawa, “Topotactic reductive fluorination of strontium cobalt oxide epitaxial thin films”, J. Sol-Gel Sci. Technol. 73, 527 (2015).

[4] T. Katayama, A. Chikamatsu, H. Kamisaka, Y. Yokoyama, Y. Hirata, H. Wadati, T. Fukumura, and T. Hasegawa, “Topotactic synthesis of strontium cobalt oxyhydride thin film with perovskite structure”, AIP Adv. 5, 107147 (2015).

[3] T. Katayama, A. Chikamatsu, Y. Hirose, R. Takagi, H. Kamisaka, T. Fukumura, and T. Hasegawa, “Topotactic fluorination of strontium iron oxide thin films using polyvinylidene fluoride”, J. Mater. Chem. C 2, 5350 (2014).

[2] T. Katayama, A. Chikamatsu, Y Hirose, H. Kumigashira, T. Fukumura, and T. Hasegawa, “Metallic conductivity in infinite-layer strontium iron oxide thin films reduced by calcium hydride”, J. Phys. D: Appl. Phys. 47, 135304 (2014).

[1] A. Chikamatsu, T. Matsuyama, T. Katayama, Y. Hirose, H. Kumigashira, M. Oshima, T. Fukumura, T. Hasegawa, “Electronic and transport properties of Eu-substituted infinite-layer strontium ferrite thin films”, J. Cryst. Growth 378, 165 (2013).

[5] JSTさきがけ　誘電・光学応用に向けた新奇酸フッ化物材料の創出（研究代表者）2021年10月1日～2025年3月31日

[4] 科学研究費補助金 基盤研究（B)　20H02614　高密度ナノドメインが拓く電荷・スピン機能開発（研究代表者）2020年4月1日～2024年3月31日

[3] 科学研究費補助金 若手研究　18K14122　単結晶酸化物シート材料の探索（研究代表者）2018年4月1日～2020年3月31日

[2] 日本学術振興会 研究活動スタート支援　16H06794　GaFeO₃型酸化物薄膜を基とした室温マルチフェロイック材料の探索（研究代表者）2016年4月1日～2018年3月31日

[1] 日本学術振興会 特別研究員DC2　14J10064　トポタクティック合成法による新奇酸化物薄膜の創出（研究代表者）2014年4月1日～2016年3月31日