Archive for March, 2012

Winkler, Taheri, and colleagues publish in Micron

Posted in News on March 12th, 2012 by admin – Comments Off on Winkler, Taheri, and colleagues publish in Micron

Christopher Winkler and Dr. Taheri’s latest paper, titled “Direct Observation of Ferroelectric Domain Switching in Varying Electric Field Regimes using in situ TEM” has been published online in the journal Micron.

From the abstract: “In situ Transmission Electron Microscopy (TEM) techniques can potentially fill in gaps in the current understanding interfacial phenomena in complex oxides. Select multiferroic oxide materials, such as BiFeO3 (BFO), exhibit ferroelectric and magnetic order, and the two order parameters are coupled through a quantum-mechanical exchange interaction. The magneto-electric coupling in BFO allows control of the ferroelectric and magnetic domain structures via applied electric fields. Because of these unique properties, BFO and other magneto-electric multiferroics constitute a promising class of materials for incorporation into devices such as high-density ferroelectric and magnetoresistive memories, spin valves, and magnetic field sensors. The magneto-electric coupling in BFO is mediated by volatile ferroelastically switched domains that make it difficult to incorporate this material into devices. To facilitate device integration, an understanding of the microstructural factors that affect ferroelastic relaxation and ferroelectric domain switching must be developed. In this article, a method of viewing ferroelectric (and ferroelastic) domain dynamics using in situ biasing in TEM is presented. . .”

The unedited paper can be viewed directly here.

The paper can also be accessed on Elsevier’s website at Micron.

Spurgeon publishes highlight on inverse spin Hall effect in MRS Bulletin

Posted in News on March 11th, 2012 by admin – Comments Off on Spurgeon publishes highlight on inverse spin Hall effect in MRS Bulletin

Steven Spurgeon has published a new research highlight in the Materials Research Society Bulletin‘s March 2012 issue. The article describes work by researchers utilizing the inverse spin Hall effect to probe spin-orbit coupling in materials with long spin lifetimes.

From the article: “Designers of next-generation electronics are trying to take advantage of both the electron’s charge and spin. The success of spintronic devices therefore hinges on the ability to convert between spin and charge currents. The direct spin Hall effect is typically used to probe spin-orbit coupling in these materials, but the technique cannot be applied to semiconductors with long spin lifetimes, such as indirect bandgap silicon. Researchers Kazuya Ando and Eiji Saitoh at Tohoku University in Sendai, Japan, have turned their attention to the inverse spin Hall effect (ISHE), which makes use of the high resistivity of semiconductors to detect tiny spin currents. Ando and Saitoh show that it is possible to study spin-orbit interactions using ISHE in otherwise unmeasurable systems. . . .”

The article can be viewed directly here or on the Materials Research Society Bulletin website.

The paper discussed in this article is available at Nature Communications.

Alicia Kriete awarded Axel-Madsen Conference Grant

Posted in News on March 2nd, 2012 by admin – Comments Off on Alicia Kriete awarded Axel-Madsen Conference Grant

Alicia Kriete has been awarded a $1,500 Axel-Madsen Conference Grant to attend the 2012 PowderMet Conference in Nashville, Tennessee. As one of only three recipients, Alicia will have her travel, housing, and conference registration paid for. She will be presenting a talk and technical poster during the week of June 10th.

For more information about the Axel-Madsen Grant Program, see: MPIF Scholarships

For more information about the 2012 PowderMet Conference, see: PowderMet 2012 Gateway