Donovan Hilliard
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View article: Elastic limit and relaxation of GaAs/In(Al,Ga)As core/shell nanowires for near-infrared applications
Elastic limit and relaxation of GaAs/In(Al,Ga)As core/shell nanowires for near-infrared applications Open
In the GaAs/In x (Al,Ga) 1– x As core/shell nanowire (CSNW) geometry, narrow cores exhibit significant bandgap reduction and enhanced electron mobility because of their ability to sustain extreme tensile elastic strain. In such an elastic …
View article: At the Limit of Interfacial Sharpness in Nanowire Axial Heterostructures
At the Limit of Interfacial Sharpness in Nanowire Axial Heterostructures Open
As semiconductor devices approach dimensions at the atomic scale, controlling the compositional grading across heterointerfaces becomes paramount. Particularly in nanowire axial heterostructures, which are promising for a broad spectrum of…
View article: Tunable\nMagnetic Vortex Dynamics in Ion-Implanted\nPermalloy Disks
Tunable\nMagnetic Vortex Dynamics in Ion-Implanted\nPermalloy Disks Open
Nanoscale,\nlow-phase-noise, tunable transmitter–receiver\nlinks are key for enabling the progress of wireless communication.\nWe demonstrate that vortex-based spin-torque nano-oscillators, which\nare intrinsically low-noise devices becaus…
View article: Ion-Irradiation-Induced Cobalt/Cobalt Oxide Heterostructures: Printing 3D Interfaces
Ion-Irradiation-Induced Cobalt/Cobalt Oxide Heterostructures: Printing 3D Interfaces Open
Interfaces separating ferromagnetic (FM) layers from non-ferromagnetic layers offer unique properties due to spin-orbit coupling and symmetry breaking, yielding effects such as exchange bias, perpendicular magnetic anisotropy, spin-pumping…
View article: Controllable growth of vertically aligned graphene on C-face SiC
Controllable growth of vertically aligned graphene on C-face SiC Open
We investigated how to control the growth of vertically aligned graphene on C-face SiC by varying the processing conditions. It is found that, the growth rate scales with the annealing temperature and the graphene height is proportional to…