Archive for May, 2014

Winkler, Jablonski, Taheri and colleagues publish in Nano Letters

Posted in News on May 12th, 2014 by admin – Comments Off on Winkler, Jablonski, Taheri and colleagues publish in Nano Letters

Christopher Winkler, Michael Jablonski, Dr. Taheri, and colleagues’ latest paper, titled “Real-time observation of local strain effects on non-volatile ferroelectric memory storage mechanisms,” has been published online in the Nano Letters.

From the abstract: “We use in situ transmission electron microscopy to directly observe, at high temporal and spatial resolution, the interaction of ferroelectric domains and dislocation networks within BiFeO3 thin films. The experimental observations are compared with a phase field model constructed to simulate the dynamics of domains in the presence of dislocations and their resulting strain fields. We demonstrate that a global network of misfit dislocations at the film-substrate interface can act as nucleation sites and slow down domain propagation in the vicinity of the dislocations. Networks of individual threading dislocations emanating from the film-electrode interface play a more dramatic role in pinning domain motion. These dislocations may be responsible for the domain behavior in ferroelectric thin-film devices deviating from conventional Kolmogorov-Avrami-Ishibashi dynamics towards a Nucleation Limited Switching model.”

The accepted proof of the paper can be accessed here.

More information is available on the ACS website.

Vetterick defends doctoral thesis

Posted in News on May 9th, 2014 by admin – Comments Off on Vetterick defends doctoral thesis

Vetterick Defense

Greg Vetterick has successfully defended his doctoral thesis on the “Radiation Tolerance Mechanisms in Nanocrystalline BCC Iron!”