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Hiroshi Funakubo
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Journal Articles

Impact of film composition on crystal structure and ferroelectricity in (Al1−x−yGaxScy)N ternary wurtzite thin films

Reika Ota, Nana Sun, Kazuki Okamoto, Shinnosuke Yasuoka, Yoshihiro Ueoka, Daiki Shono, Masami Mesuda, Hiroshi Funakubo
Journal: APL Materials
APL Mater. 13, 041120 (2025)
https://doi.org/10.1063/5.0261572
Published: April 2025
View articletitled, Impact of film composition on crystal structure and ferroelectricity in (Al1−x−yGaxScy)N ternary wurtzite thin films
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Journal Articles

Invariant discovery of features across multiple length scales: Applications in microscopy and autonomous materials characterization

Aditya Raghavan, Utkarsh Pratiush, Mani Valleti, Richard (Yu) Liu, Reece Emery, Hiroshi Funakubo, Yongtao Liu, Philip Rack, Sergei Kalinin
Journal: Journal of Applied Physics
J. Appl. Phys. 137, 034901 (2025)
https://doi.org/10.1063/5.0233070
Published: January 2025
View articletitled, Invariant discovery of features across multiple length scales: Applications in microscopy and autonomous materials characterization
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Journal Articles

Excellent piezoelectric and ferroelectric properties of ScxGa1−xN alloy with high Sc concentration

Masato Uehara, Kenji Hirata, Yoshiko Nakamura, Sri Ayu Anggraini, Kazuki Okamoto, Hiroshi Yamada, Hiroshi Funakubo, Morito Akiyama
Journal: APL Materials
APL Mater. 12, 121102 (2024)
https://doi.org/10.1063/5.0236507
Published: December 2024
View articletitled, Excellent piezoelectric and ferroelectric properties of ScxGa1−xN alloy with high Sc concentration
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Journal Articles

High stability of the ferroelectricity against hydrogen gas in (Al,Sc)N thin films

Featured
Nana Sun, Kazuki Okamoto, Shinnosuke Yasuoka, Soshun Doko, Naoko Matsui, Toshikazu Irisawa, Koji Tsunekawa, Takayoshi Katase, Tomoyuki Koganezawa, Tomotaka Nakatani, Rosantha Kumara, Osami Sakata, Hiroshi Funakubo
Journal: Applied Physics Letters
Appl. Phys. Lett. 125, 032904 (2024)
https://doi.org/10.1063/5.0202063
Published: July 2024
View articletitled, High stability of the ferroelectricity against hydrogen gas in (Al,Sc)N thin films
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Journal Articles

Unraveling the impact of initial choices and in-loop interventions on learning dynamics in autonomous scanning probe microscopy

Boris N. Slautin, Yongtao Liu, Hiroshi Funakubo, Sergei V. Kalinin
Journal: Journal of Applied Physics
J. Appl. Phys. 135, 154901 (2024)
https://doi.org/10.1063/5.0198316
Published: April 2024
View articletitled, Unraveling the impact of initial choices and in-loop interventions on learning dynamics in autonomous scanning probe microscopy
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Journal Articles

Domain structures of PbTiO3 and Pb(Zr,Ti)O3 thin films controlled by tensile strain induced by a Sr(Zr,Ti)O3 buffer layer

Editor’s Pick
Tomohide Morikawa, Masanori Kodera, Takao Shimizu, Keisuke Ishihama, Yoshitaka Ehara, Osami Sakata, Hiroshi Funakubo
Journal: Applied Physics Letters
Appl. Phys. Lett. 124, 032901 (2024)
https://doi.org/10.1063/5.0180449
Published: January 2024
View articletitled, Domain structures of PbTiO3 and Pb(Zr,Ti)O3 thin films controlled by tensile strain induced by a Sr(Zr,Ti)O3 buffer layer
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Includes: Supplementary data
Journal Articles

Introduction of strain-relaxed 90° domain structure by lattice mismatch in tetragonal ferroelectric (Bi,K)TiO3 epitaxial films grown hydrothermally below Curie temperature

Rurika Kubota, Yuxian Hu, Takahisa Shiraishi, Akinori Tateyama, Yoshiharu Ito, Minoru Kurosawa, Hiroshi Funakubo
Journal: Journal of Applied Physics
J. Appl. Phys. 134, 234102 (2023)
https://doi.org/10.1063/5.0176337
Published: December 2023
View articletitled, Introduction of strain-relaxed 90° domain structure by lattice mismatch in tetragonal ferroelectric (Bi,K)TiO3 epitaxial films grown hydrothermally below Curie temperature
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Journal Articles

Scalable ferroelectricity of 20 nm-thick (Al0.8Sc0.2)N thin films sandwiched between TiN electrodes

Reika Ota, Shinnosuke Yasuoka, Ryoichi Mizutani, Takahisa Shiraishi, Kazuki Okamoto, Kuniyuki Kakushima, Tomoyuki Koganezawa, Osami Sakata, Hiroshi Funakubo
Journal: Journal of Applied Physics
J. Appl. Phys. 134, 214103 (2023)
https://doi.org/10.1063/5.0166288
Published: December 2023
View articletitled, Scalable ferroelectricity of 20 nm-thick (Al0.8Sc0.2)N thin films sandwiched between TiN electrodes
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Journal Articles

Invariant polarization switching kinetics in an (Al0.8Sc0.2)N film with frequency and temperature

Shinnosuke Yasuoka, Ryoichi Mizutani, Reika Ota, Takahisa Shiraishi, Takao Shimizu, Kazuki Okamoto, Masato Uehara, Hiroshi Yamada, Morito Akiyama, Hiroshi Funakubo
Journal: Applied Physics Letters
Appl. Phys. Lett. 123, 202902 (2023)
https://doi.org/10.1063/5.0171108
Published: November 2023
View articletitled, Invariant polarization switching kinetics in an (Al0.8Sc0.2)N film with frequency and temperature
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Includes: Supplementary data
Journal Articles

Roadmap on ferroelectric hafnia- and zirconia-based materials and devices

José P. B. Silva, Ruben Alcala, Uygar E. Avci, Nick Barrett, Laura Bégon-Lours, Mattias Borg, Seungyong Byun, Sou-Chi Chang, Sang-Wook Cheong, Duk-Hyun Choe, Jean Coignus, Veeresh Deshpande, Athanasios Dimoulas, Catherine Dubourdieu, Ignasi Fina, Hiroshi Funakubo, Laurent Grenouillet, Alexei Gruverman, Jinseong Heo, Michael Hoffmann, H. Alex Hsain, Fei-Ting Huang, Cheol Seong Hwang, Jorge Íñiguez, Jacob L. Jones, Ilya V. Karpov, Alfred Kersch, Taegyu Kwon, Suzanne Lancaster, Maximilian Lederer, Younghwan Lee, Patrick D. Lomenzo, Lane W. Martin, Simon Martin, Shinji Migita, Thomas Mikolajick, Beatriz Noheda, Min Hyuk Park, Karin M. Rabe, Sayeef Salahuddin, Florencio Sánchez, Konrad Seidel, Takao Shimizu, Takahisa Shiraishi, Stefan Slesazeck, Akira Toriumi, Hiroshi Uchida, Bertrand Vilquin, Xianghan Xu, Kun Hee Ye, Uwe Schroeder
Journal: APL Materials
APL Mater. 11, 089201 (2023)
https://doi.org/10.1063/5.0148068
Published: August 2023
View articletitled, Roadmap on ferroelectric hafnia- and zirconia-based materials and devices
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Journal Articles

Film thickness dependence of in-plane ferroelastic domain structure in constrained tetragonal PbTiO3 films induced by isotropic tensile strain

Yoshitaka Ehara, Takaaki Nakashima, Daichi Ichinose, Takao Shimizu, Takahisa Shiraishi, Osami Sakata, Tomoaki Yamada, Shintaro Yasui, Ken Nishida, Hiroshi Funakubo
Journal: Applied Physics Letters
Appl. Phys. Lett. 121, 262901 (2022)
https://doi.org/10.1063/5.0119843
Published: December 2022
View articletitled, Film thickness dependence of in-plane ferroelastic domain structure in constrained tetragonal PbTiO3 films induced by isotropic tensile strain
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Includes: Supplementary data
Journal Articles

Ferroelectric and piezoelectric properties of 100 nm-thick CeO2-HfO2 epitaxial films

Takahisa Shiraishi, Toyohiko J. Konno, Hiroshi Funakubo
Journal: Applied Physics Letters
Appl. Phys. Lett. 120, 132901 (2022)
https://doi.org/10.1063/5.0088491
Published: March 2022
View articletitled, Ferroelectric and piezoelectric properties of 100 nm-thick CeO2-HfO2 epitaxial films
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Includes: Supplementary data
Journal Articles

Film thickness dependence of ferroelectric properties in polar-axis-oriented epitaxial tetragonal (Bi,K)TiO3 films prepared by hydrothermal method

Rurika Kubota, Akinori Tateyama, Takahisa Shiraishi, Yoshiharu Ito, Minoru Kurosawa, Hiroshi Funakubo
Journal: AIP Advances
AIP Advances 12, 035241 (2022)
https://doi.org/10.1063/5.0084170
Published: March 2022
View articletitled, Film thickness dependence of ferroelectric properties in polar-axis-oriented epitaxial tetragonal (Bi,K)TiO3 films prepared by hydrothermal method
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Includes: Supplementary data
Journal Articles

Domain structures induced by tensile thermal strain in epitaxial PbTiO3 films on silicon substrates

Tomoya Sato, Masanori Kodera, Daichi Ichinose, Takanori Mimura, Takao Shimizu, Tomoaki Yamada, Hiroshi Funakubo
Journal: Journal of Applied Physics
J. Appl. Phys. 131, 035301 (2022)
https://doi.org/10.1063/5.0074884
Published: January 2022
View articletitled, Domain structures induced by tensile thermal strain in epitaxial PbTiO3 films on silicon substrates
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Includes: Supplementary data
Journal Articles

Polar-axis-oriented epitaxial tetragonal (Bi,K)TiO3 films with large remanent polarization deposited below Curie temperature by a hydrothermal method

Yoshiharu Ito, Akinori Tateyama, Rurika Kubota, Takahisa Shiraishi, Takao Shimizu, Jaemyung Kim, Okkyun Seo, Osami Sakata, Minoru Kurosawa, Hiroshi Funakubo
Journal: Applied Physics Letters
Appl. Phys. Lett. 120, 022903 (2022)
https://doi.org/10.1063/5.0075014
Published: January 2022
View articletitled, Polar-axis-oriented epitaxial tetragonal (Bi,K)TiO3 films with large remanent polarization deposited below Curie temperature by a hydrothermal method
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Includes: Supplementary data
Journal Articles

Demonstration of ferroelectricity in ScGaN thin film using sputtering method

Masato Uehara, Ryoichi Mizutani, Shinnosuke Yasuoka, Takahisa Shiraishi, Takao Shimizu, Hiroshi Yamada, Morito Akiyama, Hiroshi Funakubo
Journal: Applied Physics Letters
Appl. Phys. Lett. 119, 172901 (2021)
https://doi.org/10.1063/5.0068059
Published: October 2021
View articletitled, Demonstration of ferroelectricity in ScGaN thin film using sputtering method
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Includes: Supplementary data
Journal Articles

Composition dependencies of crystal structure and electrical properties of epitaxial tetragonal (Bi, Na)TiO3–BaTiO3 films grown on (100)cSrRuO3//(100)SrTiO3 substrates by pulsed laser depositions

Keisuke Ishihama, Takao Shimizu, Wakiko Yamaoka, Risako Tsurumaru, Shintaro Yoshimura, Yusuke Sato, Hiroshi Funakubo
Journal: Journal of Applied Physics
J. Appl. Phys. 130, 134102 (2021)
https://doi.org/10.1063/5.0063385
Published: October 2021
View articletitled, Composition dependencies of crystal structure and electrical properties of epitaxial tetragonal (Bi, Na)TiO3–BaTiO3 films grown on (100)cSrRuO3//(100)SrTiO3 substrates by pulsed laser depositions
Open the PDF for Composition dependencies of crystal structure and electrical properties of epitaxial tetragonal (Bi, Na)TiO3–BaTiO3 films grown on (100)cSrRuO3//(100)SrTiO3 substrates by pulsed laser depositions in another window
Journal Articles

Large thermal hysteresis of ferroelectric transition in HfO2-based ferroelectric films

Takanori Mimura, Takao Shimizu, Osami Sakata, Hiroshi Funakubo
Journal: Applied Physics Letters
Appl. Phys. Lett. 118, 112903 (2021)
https://doi.org/10.1063/5.0040934
Published: March 2021
View articletitled, Large thermal hysteresis of ferroelectric transition in HfO2-based ferroelectric films
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Includes: Supplementary data
Journal Articles

Domain structure transition in compressively strained (100)/(001) epitaxial tetragonal PZT film

Daichi Ichinose, Takao Shimizu, Osami Sakata, Tomoaki Yamada, Yoshitaka Ehara, Hiroshi Funakubo
Journal: Journal of Applied Physics
J. Appl. Phys. 129, 024101 (2021)
https://doi.org/10.1063/5.0031803
Published: January 2021
View articletitled, Domain structure transition in compressively strained (100)/(001) epitaxial tetragonal PZT film
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Includes: Supplementary data
Journal Articles

Local C–V mapping for ferroelectrics using scanning nonlinear dielectric microscopy

Yoshiomi Hiranaga, Takanori Mimura, Takao Shimizu, Hiroshi Funakubo, Yasuo Cho
Journal: Journal of Applied Physics
J. Appl. Phys. 128, 244105 (2020)
https://doi.org/10.1063/5.0029630
Published: December 2020
View articletitled, Local C–V mapping for ferroelectrics using scanning nonlinear dielectric microscopy
Open the PDF for Local C–V mapping for ferroelectrics using scanning nonlinear dielectric microscopy in another window
Includes: Supplementary data