1-20 of 27
Morito Akiyama
Close
Save search
Follow your search
Access your saved searches in your account
Close Modal
Sort by
Journal Articles

Effect of phase transition on the piezoelectric properties of scandium-alloyed gallium nitride

Kenji Hirata, Yu Ikemoto, Masato Uehara, Hiroshi Yamada, Sri Ayu Anggraini, Morito Akiyama
Journal: Journal of Applied Physics
J. Appl. Phys. 135, 164101 (2024)
https://doi.org/10.1063/5.0191816
Published: April 2024
View article titled, Effect of phase transition on the piezoelectric properties of scandium-alloyed gallium nitride
Open the PDF for Effect of phase transition on the piezoelectric properties of scandium-alloyed gallium nitride in another window
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 article titled, Invariant polarization switching kinetics in an (Al<sub>0.8</sub>Sc<sub>0.2</sub>)N film with frequency and temperature
Open the PDF for Invariant polarization switching kinetics in an (Al<sub>0.8</sub>Sc<sub>0.2</sub>)N film with frequency and temperature in another window
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 article titled, Demonstration of ferroelectricity in ScGaN thin film using sputtering method
Open the PDF for Demonstration of ferroelectricity in ScGaN thin film using sputtering method in another window
Includes: Supplementary data
Journal Articles

First-principles calculations of spontaneous polarization in ScAlN

Koga Furuta, Kenji Hirata, Sri Ayu Anggraini, Morito Akiyama, Masato Uehara, Hiroshi Yamada
Journal: Journal of Applied Physics
J. Appl. Phys. 130, 024104 (2021)
https://doi.org/10.1063/5.0051557
Published: July 2021
View article titled, First-principles calculations of spontaneous polarization in ScAlN
Open the PDF for First-principles calculations of spontaneous polarization in ScAlN in another window
Journal Articles

Effects of deposition conditions on the ferroelectric properties of (Al1−xScx)N thin films

Shinnosuke Yasuoka, Takao Shimizu, Akinori Tateyama, Masato Uehara, Hiroshi Yamada, Morito Akiyama, Yoshiomi Hiranaga, Yasuo Cho, Hiroshi Funakubo
Journal: Journal of Applied Physics
J. Appl. Phys. 128, 114103 (2020)
https://doi.org/10.1063/5.0015281
Published: September 2020
View article titled, Effects of deposition conditions on the ferroelectric properties of (Al<sub>1−<em>x</em></sub>Sc<em><sub>x</sub></em>)N thin films
Open the PDF for Effects of deposition conditions on the ferroelectric properties of (Al<sub>1−<em>x</em></sub>Sc<em><sub>x</sub></em>)N thin films in another window
Includes: Supplementary data
Journal Articles

Increase in the piezoelectric response of scandium-doped gallium nitride thin films sputtered using a metal interlayer for piezo MEMS

Masato Uehara, Takaaki Mizuno, Yasuhiro Aida, Hiroshi Yamada, Keiichi Umeda, Morito Akiyama
Journal: Applied Physics Letters
Appl. Phys. Lett. 114, 012902 (2019)
https://doi.org/10.1063/1.5066613
Published: January 2019
View article titled, Increase in the piezoelectric response of scandium-doped gallium nitride thin films sputtered using a metal interlayer for piezo MEMS
Open the PDF for Increase in the piezoelectric response of scandium-doped gallium nitride thin films sputtered using a metal interlayer for piezo MEMS in another window
Journal Articles

Giant increase in piezoelectric coefficient of AlN by Mg-Nb simultaneous addition and multiple chemical states of Nb

Scilight
Masato Uehara, Hokuto Shigemoto, Yuki Fujio, Toshimi Nagase, Yasuhiro Aida, Keiichi Umeda, Morito Akiyama
Journal: Applied Physics Letters
Appl. Phys. Lett. 111, 112901 (2017)
https://doi.org/10.1063/1.4990533
Published: September 2017
View article titled, Giant increase in piezoelectric coefficient of AlN by Mg-Nb simultaneous addition and multiple chemical states of Nb
Open the PDF for Giant increase in piezoelectric coefficient of AlN by Mg-Nb simultaneous addition and multiple chemical states of Nb in another window
Journal Articles

Influence of scandium concentration on power generation figure of merit of scandium aluminum nitride thin films

Morito Akiyama, Keiichi Umeda, Atsushi Honda, Toshimi Nagase
Journal: Applied Physics Letters
Appl. Phys. Lett. 102, 021915 (2013)
https://doi.org/10.1063/1.4788728
Published: January 2013
View article titled, Influence of scandium concentration on power generation figure of merit of scandium aluminum nitride thin films
Open the PDF for Influence of scandium concentration on power generation figure of merit of scandium aluminum nitride thin films in another window
Journal Articles

Correlation between polarity distribution and piezoelectric response of solution-deposited Zn1-xLixO films

Toshimi Nagase, Toshihiro Kamohara, Keiko Nishikubo, Satoru Fukamachi, Kazuhisa Shobu, Morito Akiyama
Journal: Journal of Applied Physics
J. Appl. Phys. 110, 114120 (2011)
https://doi.org/10.1063/1.3665636
Published: December 2011
View article titled, Correlation between polarity distribution and piezoelectric response of solution-deposited Zn<sub>1-<em>x</em></sub>Li<sub><em>x</em></sub>O films
Open the PDF for Correlation between polarity distribution and piezoelectric response of solution-deposited Zn<sub>1-<em>x</em></sub>Li<sub><em>x</em></sub>O films in another window
Journal Articles

Blue-green light photochromism in europium doped BaMgSiO 4

Morito Akiyama
Journal: Applied Physics Letters
Appl. Phys. Lett. 97, 181905 (2010)
https://doi.org/10.1063/1.3509417
Published: November 2010
View article titled, Blue-green light photochromism in europium doped BaMgSiO 4
Open the PDF for Blue-green light photochromism in europium doped BaMgSiO 4 in another window
Journal Articles

Influence of growth temperature and scandium concentration on piezoelectric response of scandium aluminum nitride alloy thin films

Morito Akiyama, Kazuhiko Kano, Akihiko Teshigahara
Journal: Applied Physics Letters
Appl. Phys. Lett. 95, 162107 (2009)
https://doi.org/10.1063/1.3251072
Published: October 2009
View article titled, Influence of growth temperature and scandium concentration on piezoelectric response of scandium aluminum nitride alloy thin films
Open the PDF for Influence of growth temperature and scandium concentration on piezoelectric response of scandium aluminum nitride alloy thin films in another window
Journal Articles

Influence of oxygen concentration in sputtering gas on piezoelectric response of aluminum nitride thin films

Morito Akiyama, Toshihiro Kamohara, Kazuhiko Kano, Akihiko Teshigahara, Nobuaki Kawahara
Journal: Applied Physics Letters
Appl. Phys. Lett. 93, 021903 (2008)
https://doi.org/10.1063/1.2957654
Published: July 2008
View article titled, Influence of oxygen concentration in sputtering gas on piezoelectric response of aluminum nitride thin films
Open the PDF for Influence of oxygen concentration in sputtering gas on piezoelectric response of aluminum nitride thin films in another window
Journal Articles

Influence of polar distribution on piezoelectric response of aluminum nitride thin films

Toshihiro Kamohara, Morito Akiyama, Noriyuki Kuwano
Journal: Applied Physics Letters
Appl. Phys. Lett. 92, 093506 (2008)
https://doi.org/10.1063/1.2892041
Published: March 2008
View article titled, Influence of polar distribution on piezoelectric response of aluminum nitride thin films
Open the PDF for Influence of polar distribution on piezoelectric response of aluminum nitride thin films in another window
Journal Articles

Sensitivity enhancement in diaphragms made by aluminum nitride thin films prepared on polyimide films

Morito Akiyama, Yukari Morofuji, Keiko Nishikubo, Toshihiro Kamohara
Journal: Applied Physics Letters
Appl. Phys. Lett. 92, 043509 (2008)
https://doi.org/10.1063/1.2839319
Published: January 2008
View article titled, Sensitivity enhancement in diaphragms made by aluminum nitride thin films prepared on polyimide films
Open the PDF for Sensitivity enhancement in diaphragms made by aluminum nitride thin films prepared on polyimide films in another window
Journal Articles

Polarity inversion in aluminum nitride thin films under high sputtering power

Morito Akiyama, Toshihiro Kamohara, Naohiro Ueno, Michiru Sakamoto, Kazuhiko Kano, Akihiko Teshigahara, Nobuaki Kawahara
Journal: Applied Physics Letters
Appl. Phys. Lett. 90, 151910 (2007)
https://doi.org/10.1063/1.2721865
Published: April 2007
View article titled, Polarity inversion in aluminum nitride thin films under high sputtering power
Open the PDF for Polarity inversion in aluminum nitride thin films under high sputtering power in another window
Journal Articles

Influence of sputtering pressure on polarity distribution of aluminum nitride thin films

Toshihiro Kamohara, Morito Akiyama, Naohiro Ueno, Michiru Sakamoto, Kazuhiko Kano, Akihiko Teshigahara, Nobuaki Kawahara, Noriyuki Kuwano
Journal: Applied Physics Letters
Appl. Phys. Lett. 89, 243507 (2006)
https://doi.org/10.1063/1.2405849
Published: December 2006
View article titled, Influence of sputtering pressure on polarity distribution of aluminum nitride thin films
Open the PDF for Influence of sputtering pressure on polarity distribution of aluminum nitride thin films in another window
Journal Articles

Flexible piezoelectric pressure sensors using oriented aluminum nitride thin films prepared on polyethylene terephthalate films

Morito Akiyama, Yukari Morofuji, Toshihiro Kamohara, Keiko Nishikubo, Masayoshi Tsubai, Osamu Fukuda, Naohiro Ueno
Journal: Journal of Applied Physics
J. Appl. Phys. 100, 114318 (2006)
https://doi.org/10.1063/1.2401312
Published: December 2006
View article titled, Flexible piezoelectric pressure sensors using oriented aluminum nitride thin films prepared on polyethylene terephthalate films
Open the PDF for Flexible piezoelectric pressure sensors using oriented aluminum nitride thin films prepared on polyethylene terephthalate films in another window
Journal Articles

Local epitaxial growth of aluminum nitride and molybdenum thin films in fiber texture using aluminum nitride interlayer

Toshihiro Kamohara, Morito Akiyama, Naohiro Ueno, Kazuhiro Nonaka, Noriyuki Kuwano
Journal: Applied Physics Letters
Appl. Phys. Lett. 89, 071919 (2006)
https://doi.org/10.1063/1.2337558
Published: August 2006
View article titled, Local epitaxial growth of aluminum nitride and molybdenum thin films in fiber texture using aluminum nitride interlayer
Open the PDF for Local epitaxial growth of aluminum nitride and molybdenum thin films in fiber texture using aluminum nitride interlayer in another window
Journal Articles

Ultrahigh temperature vibration sensors using aluminum nitride thin films and W ∕ Ru multilayer electrodes

Morito Akiyama, Toshihiro Kamohara, Keiko Nishikubo, Naohiro Ueno, Hideaki Nagai, Takeshi Okutani
Journal: Applied Physics Letters
Appl. Phys. Lett. 86, 022106 (2005)
https://doi.org/10.1063/1.1850193
Published: January 2005
View article titled, Ultrahigh temperature vibration sensors using aluminum nitride thin films and W ∕ Ru multilayer electrodes
Open the PDF for Ultrahigh temperature vibration sensors using aluminum nitride thin films and W ∕ Ru multilayer electrodes in another window
Journal Articles

Intense visible light emission from stress-activated SrMgAl 6 O 11 : Eu

Morito Akiyama, Keiko Nishikubo, Kazuhiro Nonaka
Journal: Applied Physics Letters
Appl. Phys. Lett. 83, 650–652 (2003)
https://doi.org/10.1063/1.1594828
Published: July 2003
View article titled, Intense visible light emission from stress-activated SrMgAl 6 O 11 : Eu
Open the PDF for Intense visible light emission from stress-activated SrMgAl 6 O 11 : Eu in another window