Archive for December, 2013

Spurgeon, Sloppy, Taheri and colleagues publish in ACS Nano

Posted in News on December 8th, 2013 by admin – Comments Off on Spurgeon, Sloppy, Taheri and colleagues publish in ACS Nano

Steven Spurgeon, Dr. Jennifer Sloppy, Dr. Taheri, and colleagues’ latest paper, titled “Thickness-Dependent Crossover from Charge- to Strain-Mediated Magnetoelectric Coupling in Ferromagnetic / Piezoelectric Oxide Heterostructures” has been published online in the ACS Nano.

From the abstract: “Magnetoelectric oxide heterostructures are proposed active layers for spintronic memory and logic devices, where information is conveyed through spin transport in the solid state. Incomplete theories of the coupling between local strain, charge, and magnetic order have limited their deployment into new information and communication technologies. In this study, we report direct, local measurements of strain- and charge-mediated magnetization changes in the La0.7Sr0.3MnO3 / PbZr0.2Ti0.8O3 system using spatially-resolved characterization techniques in both real and reciprocal space. Polarized neutron reflectometry reveals a graded magnetization that results from both local structural distortions and interfacial screening of bound surface charge from the adjacent ferroelectric. Density functional theory calculations support the experimental observation that strain locally suppresses the magnetization through a change in the Mn-eg orbital polarization. We suggest that this local coupling and magnetization suppression may be tuned by controlling the manganite and ferroelectric layer thicknesses, with direct implications for device applications.”

The uncorrected proof of the paper can be accessed on the ACS website: ACS Nano.

Barr and Spurgeon win MRS awards

Posted in News on December 7th, 2013 by admin – Comments Off on Barr and Spurgeon win MRS awards

Christopher Barr and Steven Spurgeon recently won awards for their research at the 2013 Fall MRS Meeting in Boston.

Barr’s poster, titled “Anisotropic Behavior of Radiation Induced Segregation with Grain Boundary Character and Grain Size in Model Fcc Ni-Cr Alloys,” was selected for a silver poster award in Symposium ZZ — Nanostructured Materials in Extreme Environments. The award consists of a certificate and a $100 honorarium.

Spurgeon was invited to present a talk, titled “Thickness-Dependent Crossover from Charge- to Strain-Mediated Magnetoelectric Coupling in Ferromagnetic/Piezoelectric Oxide Heterostructures,” and was awarded a gold graduate student research award. This prestigious award is given to only eight of 240 applicants and consists of a plaque and $400 honorarium.

For more information about the award, visit MRS Fall 2013 Meeting Awards.