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論文 (83件)
- Tomohide Morikawa, Masanori Kodera, Takao Shimizu, Keisuke Ishihama, Yoshitaka Ehara, Osami Sakata, Hiroshi Funakubo. Domain structures of PbTiO3 and Pb(Zr,Ti)O3 thin films controlled by tensile strain induced by a Sr(Zr,Ti)O3 buffer layer. Applied Physics Letters. 2024. 124. 3
- Yoshitaka Ehara, Takaaki Nakashima, Daichi Ichinose, Takao Shimizu, Takahisa Shiraishi, Osami Sakata, Tomoaki Yamada, Shintaro Yasui, Ken Nishida, Hiroshi Funakubo. Film thickness dependence of in-plane ferroelastic domain structure in constrained tetragonal PbTiO3 films induced by isotropic tensile strain. Applied Physics Letters. 2022. 121. 26. 262901-262901
- Yoshitaka Ehara, Hitoshi Morioka, Takeshi Kobayashi, Shintaro Yasui, Ken Nishida, Hiroshi Funakubo. In-situ observation of reversible 90°-domain switching in Pb(Zr, Ti)O3 films for microcantilever structure. Japanese Journal of Applied Physics. 2022
- Shinnosuke Yasuoka, Ryoichi Mizutani, Reika Ota, Takahisa Shiraishi, Takao Shimizu, Shintaro Yasui, Yoshitaka Ehara, Ken Nishida, Masato Uehara, Hiroshi Yamada, et al. Enhancement of crystal anisotropy and ferroelectricity by decreasing thickness in (Al,Sc)N films. Journal of the Ceramic Society of Japan. 2022. 130. 7. 436-441
- Yoshitaka Ehara, Daichi Ichinose, Masanori Kodera, Takahisa Shiraishi, Takao Shimizu, Tomoaki Yamada, Ken Nishida, Hiroshi Funakubo. Influence of cooling rate on ferroelastic domain structure for epitaxial (100)/(001)-oriented Pb(Zr, Ti)O-3 thin films under tensile strain. JAPANESE JOURNAL OF APPLIED PHYSICS. 2021. 60. SF
- Daichi Ichinose, Takao Shimizu, Osami Sakata, Tomoaki Yamada, Yoshitaka Ehara, Hiroshi Funakubo. Domain structure transition in compressively strained (100)/(001) epitaxial tetragonal PZT film. Journal of Applied Physics. 2021. 129. 2
- Yoshitaka Ehara. Tensor factorization for elucidating mechanisms of piezoresponse relaxation via dynamic Piezoresponse Force Spectroscopy. npj Computational Materials. 2020. 6. 1
- Yoshitaka Ehara, Takaaki Nakashima, Daichi Ichinose, Takao Shimizu, Tomoaki Yamada, Ken Nishida, Hiroshi Funakubo. Temperature dependence on the domain structure of epitaxial PbTiO3 films grown on single crystal substrates with different lattice parameters. Japanese Journal of Applied Physics. 2020
- Yoshitaka Ehara. Dynamic Manipulation in Piezoresponse Force Microscopy: Creating Nonequilibrium Phases with Large Electromechanical Response. ACS Nano. 2020
- Yoshitaka Ehara. Large Electromechanical Responses Driven by Electrically Induced Dense Ferroelastic Domains: Beyond Morphotropic Phase Boundaries. ACS Applied Electronic Materials. 2020. 2. 7. 1908-1916
- Ehara Yoshitaka, Shimizu Takao, Yasui Shintaro, Oikawa Takahiro, Shiraishi Takahisa, Tanaka Hiroki, Kanenko Noriyuki, Maran Ronald, Yamada Tomoaki, Imai Yasuhiko, et al. Ferroelastic domain motion by pulsed electric field in (111)/(11(1)over-bar) rhombohedral epitaxial Pb(Zr0.65Ti0.35)O-3 thin films: Fast switching and relaxation. PHYSICAL REVIEW B. 2019. 100. 10
- Yang, Sang Mo, Shin, Yeong Jae, Ehara, Yoshitaka, Funakubo, Hiroshi, Yoon, Jong-Gul, Scott, James F, Noh, Tae Won. Superdomain structure and high conductivity at the vertices in the (111)-oriented epitaxial tetragonal Pb (Zr, Ti) O3 thin film. Current Applied Physics. 2019. 19. 4. 418-423
- 清水 荘雄, 江原 祥隆, 三村 和仙, 安井 伸太郎, 山田 智明, 今井 康彦, 勝矢 良雄, 坂田 修身, 舟窪 浩. 時間分解放射光X線回折を用いた菱面体晶PZTにおける非180 ̊ドメインスイッチングの周波数応答特性の評価. 応用物理学会学術講演会講演予稿集. 2018. 2018.2. 1310-1310
- Florian Weyland, Matias Acosta, Malte Vögler, Yoshitaka Ehara, Jürgen Rödel, Nikola Novak. Electric field-temperature phase diagram of sodium bismuth titanate-based relaxor ferroelectrics. Journal of Materials Science. 2018. 53. 13. 9393-9400
- Naoya Oshima, Kiyoshi Uchiyama, Yoshitaka Ehara, Takahiro Oikawa, Daichi Ichinose, Hiroki Tanaka, Tomoya Sato, Hiroshi Uchida, Hiroshi Funakubo. Fabrication and characterization of {110}-oriented Pb(Zr, Ti)O-3 thin films on Pt/SiO2/Si substrates using PdO//Pd buffer layer. JAPANESE JOURNAL OF APPLIED PHYSICS. 2017. 56. 10
- Naoya Oshima, Kiyoshi Uchiyama, Yoshitaka Ehara, Takahiro Oikawa, Hiroki Tanaka, Tomoya Sato, Hiroshi Uchida, Tomoaki Yamada, Hiroshi Funakubo. Influence of internal strains of (110)-one-axis-oriented (Ba0.5Sr0.5)TiO3 (BST) thin films on their dielectric behaviors. Science of Advanced Materials. 2017. 9. 10. 1806-1809
- Yoshitaka Ehara, Shintaro Yasui, Takahiro Oikawa, Takahisa Shiraishi, Takao Shimizu, Hiroki Tanaka, Noriyuki Kanenko, Ronald Maran, Tomoaki Yamada, Yasuhiko Imai, et al. In-situ observation of ultrafast 90 degrees domain switching under application of an electric field in (100)/(001)-oriented tetragonal epitaxial Pb(Zr0.4Ti0.6)O-3 thin films. SCIENTIFIC REPORTS. 2017. 7
- Manabu Hagiwara, Yoshitaka Ehara, Nikola Novak, Neamul H. Khansur, Azatuhi Ayrikyan, Kyle G. Webber, Shinobu Fujihara. Relaxor-ferroelectric crossover in (Bi1/2K1/2)TiO3: Origin of the spontaneous phase transition and the effect of an applied external field. PHYSICAL REVIEW B. 2017. 96. 1
- Linglong Li, Ye Cao, Suhas Somnath, Yaodong Yang, Stephen Jesse, Yoshitaka Ehara, Hiroshi Funakubo, Long-Qing Chen, Sergei V. Kalinin, Rama K. Vasudevan. Direct Imaging of the Relaxation of Individual Ferroelectric Interfaces in a Tensile-Strained Film. ADVANCED ELECTRONIC MATERIALS. 2017. 3. 4
- Takaaki Nakashima, Daichi Ichinose, Yoshitaka Ehara, Takao Shimizu, Takeshi Kobayashi, Tomoaki Yamada, Hiroshi Funakubo. Effect of in-plane tensile strain in (100)/(001)-oriented epitaxial PbTiO3 films on their phase transition temperature and tetragonal distortion. APPLIED PHYSICS LETTERS. 2017. 110. 12
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