Archive for July, 2012

Sloppy, Taheri, and colleagues publish in the Journal of the Electrochemical Society

Posted in News on July 24th, 2012 by admin – Comments Off on Sloppy, Taheri, and colleagues publish in the Journal of the Electrochemical Society

Jennifer Sloppy, Dr. Taheri, and colleagues’ latest paper, titled “Structural investigation of perovskite manganite and ferrite films on yttria-stabilized zirconia substrates” has been published online in theJournal of the Electrochemical Society.

From the abstract: “Here, we report the growth of La0.7Sr0.3MnO3 and La0.7Sr0.3FeO3 films on YSZ (001) substrates using molecular beam epitaxy. Particular emphasis is placed on the structural properties of the film and interface, which are of fundamental importance to all future studies in which model thin film systems are used to investigate interfacial reactions and morphological changes that arise at high temperatures or under polarization. Using a combination of X-ray diffraction and transmission electron microscopy, we find a columnar microstructure with a uniform crystallographic orientation present along the out-of-plane film direction and preferred in-plane orientations relative to the substrate.”

The paper can be viewed directly here.

The paper can also be freely accessed on the ECS website: Journal of the Electrochemical Society.

Spurgeon, Taheri, and colleagues publish in Applied Physics Letters

Posted in News on July 6th, 2012 by admin – Comments Off on Spurgeon, Taheri, and colleagues publish in Applied Physics Letters

Steven Spurgeon, Dr. Taheri, and colleagues’ latest paper, titled “Magnetic properties of Co2C and Co3C nanoparticles and their assemblies” has been published online in Applied Physics Letters.

From the abstract: “Nano-composite material consisting of Co2C and Co3C nanoparticles has recently been shown to exhibit unusually large coercivities and energy products. Experimental studies that can delineate the properties of individual phases have been undertaken and provide information on how the coercivities and the energy product change with the size and composition of the nanoparticles. The studies indicate that while both phases are magnetic, the Co3C has higher magnetization and coercivity compared to Co2C. Through first principles electronic structure studies using a GGA+U functional, we provide insight on the role of C intercalation on enhancing the magnetic anisotropy of the individual phases.”

The paper can be viewed directly here.

The paper can also be accessed on the AIP website at Applied Physics Letters.

Spurgeon, Sloppy, Taheri, and colleagues publish in Journal of Applied Physics

Posted in News on July 5th, 2012 by admin – Comments Off on Spurgeon, Sloppy, Taheri, and colleagues publish in Journal of Applied Physics

Steven Spurgeon and Jennifer Sloppy’s latest paper, titled “A study of the effect of iron island morphology and interface oxidation on the magnetic hysteresis of Fe-MgO (001) thin film composites” has been published online in the Journal of Applied Physics.

From the abstract: “. . .In this study, we report on transmission electron microscopy, electron energy loss spectroscopy, and magnetic characterization of Fe-MgO composite films with various morphologies. We explore relationships between film morphology, intermixing, and the resulting effects on magnetic structure. We find the presence of oxidation at the Fe-MgO interface, with a detrimental impact on the saturation magnetization of the composite. We also observe changes in coercivity and magnetocrystalline anisotropy with film morphology and thickness. These results will inform the design of MgO-based tunnel junctions and improve our understanding of how processing conditions, resulting in morphological and chemical changes such as oxidation, affect magnetization.”

The paper can be viewed directly here.

The paper can also be accessed on the AIP website at Journal of Applied Physics.