Simulations Enable Understanding of Ferroelectrics
Aaron Hand, Managing Editor -- Semiconductor International, 12/1/2006
Although ferroelectric materials are prevalent throughout the electronics world, researchers actually know very little about how the materials work. In an effort to better understand their properties at the nanoscale for continued use, physicists at the University of Arkansas have discovered previously unknown properties.
Detailed in a recent article in Physical Review Letters,¹ Sergey Prosandeev, a UA research associate in physics, and Laurent Bellaiche, a physics professor at the university, created computer simulations of ferroelectric nanodots to better understand their potential properties. With various ferroelectric materials embedded in different polarizable media, the simulations predicted the existence of different phases, and discovered previously unknown phases as well.
Earlier research by UA physicists determined that individual ferroelectric nanodots could form a vortex within the nanodot, with the charges swirling in almost a circular motion. Prosandeev and others also found that inhomogeneous electric fields can switch the chirality of the vortex.
For the latest research, Prosandeev and Bellaiche looked at how changing the nanodot's temperature, material and medium would influence the ferroelectric properties of the nanodot. Ultimately, they found six different structural phases — four of which had never been seen before. As noted in their research, “varying the polarizabilities of the embedded dots and of the medium opens a new way for engineering dipole patterns.” This could result in promising applications using negative refraction materials, they said, with possibilities for nanoscale devices with greater memory capacity.
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