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Program Highlights

A New Generation of Spintronic Devices: MgO Magnetic Tunneling Junctions

We developed a low-pressure magnetron sputtering technique together with the linear dynamic deposition method and successfully fabricated a new type of magnetic tunneling junctions (MTJs) with (001) textured MgO barrier.

Secondary Teacher Interacting with Materials Professors Strikes Gold

Background: The JHU MRSEC conducts extensive K-12 educational outreach programs aimed at promoting interest in and awareness of the importance of modern materials research.

Domains and Domain Wall Motion in Perpendicular Anisotropy Materials

Magnetic thin films with perpendicular magnetic anisotropy (PMA) have special attributes for explorations and perpendicular magnetic recording. We have observed three hitherto unknown new features in materials with PMA: 1. Asymmetrical domain nucleation centers that produce domains for only one magnetization direction (Fig. 1).

Molecular Nano-Ring Beats Like a Chime

Perfect rings of C60 molecules, lined up around circular layers of silver, reveal an important property of nanoelectronic contacts: thermal energy causes

Novel multiferroic thin film memory devices

Electric-field tunable spin valves are being investigated

Discovery of a Pb-free morphotropic phase boundary (MPB) in a high Tc piezoelectric perovskite

Piezoeletric materials are used for a variety of actuator and sensor applications. Finding a Pb-free replacement for the popular Pb(Zr,Ti)O3 has been a major challenge for the community.

Graphitic Carbon Produced at Very Low Temperatures During the Synthesis of Iron Oxide Nanoparticles

Graphitic carbon - structural forms of the element that are constructed exclusively from carbon atoms having trigonal planar coordination - is ordinarily produced under drastic physical and conditions, typically at temperatures in excess of 500° C. Columbia MRSEC scientists have uncovered a process by which this form of matter can assemble at temperatures as low as 110° C.

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