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Full-Text Articles in Physics
Dynamic Notch Pinning Fields For Domain Walls In Ferromagnetic Nanowires, Andrew Kunz, Jonathan D. Priem
Dynamic Notch Pinning Fields For Domain Walls In Ferromagnetic Nanowires, Andrew Kunz, Jonathan D. Priem
Physics Faculty Research and Publications
Artificial defects such as notches and antinotches are often attached to magnetic nanowires to serve as trapping (pinning) sites for domain walls. The magnetic field necessary to release (depin) the trapped domain wall from the notch depends on the type, geometric shape, and dimensions of the defect but is typically quite large. Conversely we show here that for some notches and antinotches there exists a much smaller driving field for which a moving domain wall will travel past the defect without becoming trapped. This dynamic pinning field also depends on the type, geometric shape and defect dimensions. Micromagnetic simulation is …
Simulations Of Field Driven Domain Wall Interactions In Ferromagnetic Nanowires, Andrew Kunz, Eric W. Rentsch
Simulations Of Field Driven Domain Wall Interactions In Ferromagnetic Nanowires, Andrew Kunz, Eric W. Rentsch
Physics Faculty Research and Publications
The interaction of domain walls in a single ferromagnetic nanowire has been observed with micromagnetic simulation. Domain walls separating domains of opposite magnetization move towards each other when an external field is applied along the long axis of the wire resulting in a collision. The final magnetic state of the wire after the collision will contain either zero (domain wall annihilation) or two (domain wall conservation) domain walls. Here we explore the behavior that determines the final state, showing that it depends on the initial domain wall configuration, the speed the domain walls are moving with before the collision, and …