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Physics Faculty Research and Publications

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Full-Text Articles in Physics

Micromagnetics Of The Domain Wall Mobility In Permalloy Nanowires, Andrew Kunz Jun 2007

Micromagnetics Of The Domain Wall Mobility In Permalloy Nanowires, Andrew Kunz

Physics Faculty Research and Publications

The domain wall mobility in long permalloy nanowires with thicknesses of 2-20 nm and widths of 50-200 nm has been simulated. The domain wall is driven into motion by an external magnetic field and the average wall mobility is calculated after the wall has traveled 2.5 mum along the wire. The results were obtained using the three-dimensional dynamic Landau-Lifshitz equation. We find that the domain wall mobility decreases linearly up to the critical field called the Walker field. The decreasing wall mobility is related to the decrease in the dynamic domain wall length as the applied field is increased. The …


Simulating The Maximum Domain Wall Speed In A Magnetic Nanowire, Andrew Kunz Oct 2006

Simulating The Maximum Domain Wall Speed In A Magnetic Nanowire, Andrew Kunz

Physics Faculty Research and Publications

The dynamics of domain wall motion in permalloy nanowires have been simulated utilizing the Landau-Lifshitz-Gilbert (LLG) equation of motion. The simulation results are presented in terms of the domain wall speed for ranges of the Gilbert damping parameter alpha and nanowire width. The maximum domain wall speed is independent of alpha. The speed of the domain wall can be increased by increasing the nanowire width, but this lowers the critical field. For applied fields below the critical field, the wall moves uniformly along the wire and the speed of the wall increases with increases in the driving field. This behavior …


Micromagnetic Simulations On The Dependence Of Gilbert Damping On Domain Wall Velocities In Magnetic Nanowires, Andrew Kunz, B. Kastor May 2006

Micromagnetic Simulations On The Dependence Of Gilbert Damping On Domain Wall Velocities In Magnetic Nanowires, Andrew Kunz, B. Kastor

Physics Faculty Research and Publications

he dependence of damping on domain wall motion and velocity in Permalloy nanowires is presented. The domain wall motion in isolated two micron long Permalloy nanowires, with a rectangular cross-section 10 nm thick and 100 nm wide, is simulated using the Landau-Lifshitz Gilbert (LLG) simulation.Interpreting LLG dynamics can be difficult due to the dependence of the results on the Gilbert damping parameter alpha. The Walker model also predicts the critical field and domain wall velocity as a function of alpha. For these combined reasons the dependence of the domain wall speeds on the damping parameter is explored.