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Full-Text Articles in Physics
Surfaces And Interfaces Of Magnetoelectric Oxide Systems, Shi Cao
Surfaces And Interfaces Of Magnetoelectric Oxide Systems, Shi Cao
Department of Physics and Astronomy: Dissertations, Theses, and Student Research
Magnetoelectric materials Cr2O3, hexagonal LuFeO3 and YbFeO3 are studied in this thesis. The surface of chromia (Cr2O3) has a surface electronic structure distinct from the bulk. Our work shows that placing a Cr2O3 single crystal into a single domain state will result in net Cr2O3 spin polarization at the boundary, even in the presence of a gold overlayer. From the Cr 2p3=2 X-ray magnetic circular dichroism signal, there is clear evidence of interface polarization with overlayers of both Pd and Pt on chromia. Cobalt thin films on Cr2O3(0001) show larger magnetic contrast in magnetic force microscopy indicating enhancement of perpendicular …
Novel Half-Metallic And Spin-Gapless Heusler Compounds, Yunlong Jin
Novel Half-Metallic And Spin-Gapless Heusler Compounds, Yunlong Jin
Department of Physics and Astronomy: Dissertations, Theses, and Student Research
This thesis is devoted to experimental studies of Heusler compounds CoFeCrAl, CoFeCrX (X = Si, Ge) and Mn2PtSn. These Heusler alloys present an interesting class of ferromagnetic materials for spintronic applications since they are predicted to be spin gapless semiconductors and have half-metallic properties with 100 % spin polarization at the Fermi level. In this thesis, the structural, magnetic, spin-polarization and electron- transport properties of the fabricated alloys were studied. CoFeCrAl thin films deposited on MgO exhibit nearly perfect epitaxy and a high degree of L21 Heusler order. All considered types of chemical disorder destroy the spin-gapless …
Fabrication And Study Of The Structure And Magnetism Of Rare-Earth Free Nanoclusters, Bhaskar Das
Fabrication And Study Of The Structure And Magnetism Of Rare-Earth Free Nanoclusters, Bhaskar Das
Department of Physics and Astronomy: Dissertations, Theses, and Student Research
No abstract provided.
The Organic Ferroelectric Vinylidene Fluoride Oligomer: Vacuum Deposition, Properties, And Interfaces, Keith Foreman
The Organic Ferroelectric Vinylidene Fluoride Oligomer: Vacuum Deposition, Properties, And Interfaces, Keith Foreman
Department of Physics and Astronomy: Dissertations, Theses, and Student Research
Organic ferroelectric materials combine the versatility and customizability afforded by organic synthesis with the functionality of ferroelectric materials. The model ferroelectric polymer, poly(vinylidene fluoride) (PVDF), is used in a wide variety of applications and is still the subject of fundamental research nearly 80 years after it was first polymerized. Unfortunately, PVDF suffers from thermal decomposition during thin film evaporation in vacuum. Since PVDF thin films cannot be deposited in the ferroelectric phase in vacuum conditions, its use in new, 21st century technologies may be limited since the interface between the organic and adjacent metallic thin films is less than …