Current Research Interests and ActivitiesI. Multilayer Thin FilmsA variety of epitaxial thin films, vapor-quench amorphous alloys, granular magnetic systems, metal nitrides, metal oxides, superconductors, and other materials have been made by multi-source sputter deposition, molecular beam epitaxy, and pulsed laser deposition.II. Bismuth Thin FilmsUsing electrodeposition, high quality bismuth single-crystal thin films and patterned structures with large magnetoresistance and long electron mean free path have been made. The large magneto-transport properties of these systems make them candidates for field sensing and spin-transport applications.III. Multilayers with Exchange BiasExtensive expertise in addressing many issues concerning exchange bias, especially the dependence of exchange bias on the constituent materials and their thickness, the memory effect, and the key role of the dynamic antiferromagnetic spin structure in controlling exchange bias.IV. Half-Metallic CrO2 FilmsEpitaxially grown CrO2 films are nearly 100% spin-polarized, thus half-metallic, which are crucial for magnetic tunnel junctions and other spintronic devices.V. Measurements of Spin PolarizationPoint-contact Andreev reflection has been advanced for the measurement of spin polarization of metals, including ferromagnets with partial spin polarization and half-metallic ferromagnets with 100% spin polarization.VI. Electrodeposited One-Dimensional StructuresMetallic and magnetic nanowires, either single material or multi-sections, can be fabricated in nanoporous templates. These quasi one-dimensional entities, a few nm wide and many microns long, exhibit a variety of unique properties for scientific and technological explorations.VII. PatterningUsing optical and electron lithography, as well as laser micromachining, patterned structures, dot and antidot arrays of metals, ferromagnets and superconductors can be created to explore nanostructure-induced properties. |
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