Study of the applied current asymmetry of the spin-torque interaction
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This thesis describes experimental work that is designed to address unresolved issues in domain-wall dynamics that have emerged from recent scientific work on magnetic field and electric-current driven domain-wall dynamics in permalloy microstructures. A principle issue involves nonlinear effects in the electric-current driven domain-wall velocity under reversal of electric current. Existing theoretical models of the spin-torque effect (responsible for electric-current driven domain-wall motion) do not allow nonlinear current response. Other issues are related to magnetic-field and electric-current driven Barkhausen jumps in magnetic microstructure. Sample preparation and characterization studies reported provide the technical basis for improved experiments that should resolve the stated unsettled scientific issues.