Politico-Engineering−Politically-Initiated Engineering in Piezoelectric Devices

Piezoelectric fields in nitride devices

We have calculated the piezoelectric field and charge distribution for various III-nitride heterostructures. Our calculations include strain energy minimization and doping effects, and are presented to show the magnitude of piezoelectric effects in strained layers. We compare our calculated results to device results where available. These include the two-dimensional electron gas in heterojuncti...

Enhanced Piezoelectric Properties of Piezoelectric Single Crystals by Domain Engineering

Various engineered domain configurations were induced into barium titanate (BaTiO3) single crystals, and their piezoelectric properties were investigated as a function of (1) the crystal structure, (2) the crystallographic orientation and (3) the domain size. As a result, the orthorhombic mm2 BaTiO3 crystals showed the highest piezoelectric properties among three kinds of BaTiO3 crystals such a...

Politico - Economic Equilibrium Andeconomic

Flexible piezoelectric devices for gastrointestinal motility sensing

© 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. 1 Media Lab, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. 2 David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA 02142, USA. 3 Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. 4 Institu...

Magnetoelectric interactions in ferromagnetic-piezoelectric layered structures: Phenomena and devices

Layered magnetostrictive-piezoelectric structures are multifunctional due to their dual-responsiveness to mechanical and electromagnetic forces. Here, we discuss studies of magnetoelectric (ME) interactions in ferrite-lead zirconate titanate (PZT) and terfenol-PZT material couples. Key findings include: (1) the observation of a giant lowfrequency ME effect in the layered systems; (2) data analy...