MORITA Takeshi
(Professor/Division of Environmental Studies)
Department of Human and Engineered Environmental Studies/Environmental Information and Microsystems
Career Summary
1994: B. Eng, Department of Precision Machinery Engineering, The University of Tokyo
1999: Dr. Eng, The University of Tokyo
1999-2001: Post doctoral researcher, Institute of Physical and Chemical Research (RIKEN)
2001-2002: Post doctoral researcher, Swiss Federal Institute of Technology (EPFL)
2002-2005: Research associate, Tohoku University
2005-present: Associate professor, The University of Tokyo
Educational Activities
Graduate School of Frontier Sciences: Micro information devices
Undergraduate School of Engineering: Mathematics for engineering
Undergraduate School of Engineering: Vibration systems
Research Activities
We are conducting fundamental and applied research on ferroelectric materials. Ferroelectric materials possess the piezoelectric property, nonlinear optical effect, and charge memory effect. These properties are strongly related to the domain mechanism. We are trying to verify these relationships and to apply them to innovative information devices.
Current research topics include:
1) shape-memory piezoelectric devices and a domain control system,
2) environmentally friendly ferroelectric materials synthesized with the hydrothermal method,
3) a piezoelectric actuator control system using a self-sensing technique, and
4) new piezoelectric actuators.
Literature
1)Hideyuki Ikeda and Takeshi Morita, "High-precision positioning using a self-sensing piezoelectric actuator control with a differential detection method", Sensors and Actuators, (accepted)
2)Takuma Nishimura, Hiroshi Hosaka and Takeshi Morita, "Resonant-type SIDM actuator using a bolt-clamped Langevin transducer", Ultrasonics (accepted)
3)Jens Twiefel and Takeshi Morita, "Utilizing multilayer lithium niobate elements for ultrasonic actuators", Sensors and Actuators, vol. 166, pp. 78-82, 2011
4)Takafumi Maeda, Tobias Hemsel1, and Takeshi Morita, "Improved process for hydrothermal lead-free piezoelectric powders and performances of sintered (K0.48Na0.52)NbO3 ceramics, Jpn. J. Appl. Phys. vol. 50, 07HC01, 2011
5)Takeshi Morita, "Piezoelectric materials synthesized by the hydrothermal method and their applications", Materials, vol. 3, pp. 5236-5245, 2010
6)Takeshi Morita and Tomoya Ozaki, "Magnetic force memory effect from a composite of a magnetostrictive material and a shape memory piezoelectric actuator", Sensors and Actuators, vol. 161, pp. 266-270, 2010
Other Activities
Institute of Electrical and Electronics Engineers (IEEE)
Institute of Electronics, Information and Communication Engineers of Japan (IEICE)
Information Processing Society of Japan (IPSJ)
Institute of Electrical Engineers of Japan (IEEJ)
Future Plan
Understanding the domain mechanism inside ferroelectric materials would expand our knowledge for future innovative devices. As an example, we developed the "shape memory effect" by using the ferroelectric domain control technique. Such a finding is quite exciting. In addition, environmentally friendly materials should be used for such effects instead of lead-containing materials such as PZT.
Messages to Students
Where there is a will, there is a way. Let's enjoy together!