OVERVIEW

We study multiferroic tunnel junctions, electrical control of spins through interfacial magnetoelectric coupling, topological insulator nanotubes and nanowires, strong correlated electron systems, and multiband superconductivity.


TOPOLOGICAL INSULATORS

The focus of this research is on new transport phenomena in topologically insulating thin films and nanostructures. The sample fabrication involves contact photolithography and focused ion beam deposition. Measurements are conducted in high magnetic fields at low temperature.


MULTIFERROIC TUNNEL JUNCTIONS

The goal of this project is the creation of tunnel junctions with four distinct resistance states and superior switching characteristics. This can be achieved by inserting a ferroelectric material as the insulating barrier between two ferromagnetic electrodes. Samples are fabricated using pulsed laser deposition, contact photolithography, DC and RF magnetron sputtering, and ion milling.


MAGNETIC FILMS AND NANOSTRUCTURES

The focus in this area is on materials exhibiting colossal magnetoresistance (we have found an unusually large low field magnetoresistance effect for strained manganite ultrathin films and nanobridges) and large anisotropic magnetoresistance, and spin-polarized tunneling in magnetic oxide tunnel junction devices.


SUPERCONDUCTORS

This project studies various multiband effects in the new (Tc ~ 40 K) MgB2 superconductor with varying degrees of scattering.


NOVEL OXIDE THIN FILMS AND HETEROSTRUCTURES

The goal of this project is to study the growth and electrical, magnetic, thermoelectric, and nonlinear properties of oxide thin films and multilayer structures. The emphasis is on functional materials that show unusual properties. The applications of such devices are also explored.


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