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Micromagnetic Simulations On The Dependence Of Gilbert Damping On Domain Wall Velocities In Magnetic Nanowires, Andrew Kunz, B. Kastor
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.
Simulated Domain Wall Dynamics In Magnetic Nanowires, Andrew Kunz
Simulated Domain Wall Dynamics In Magnetic Nanowires, Andrew Kunz
Physics Faculty Research and Publications
The simulated domain wall dynamics in rectangular 10 nm thick, 2000 nm long Permalloy wires of varying width is presented. In the absence of an applied field the static domain wall length is found to be linearly dependent to the width of the nanowire. As magnetic fields of increasing strength are applied along the wire’s long axis, the domain wall motion changes from a uniform reversal to a steplike reversal. The onset of the stepping motion leads to a decrease in the domain wall speed. By continuing to increase the field it is possible to decrease the time between steps …