Eddy current damping of thin film domain walls

A self-consistent two-dimensional numerical model, is developed to study eddy current damped domain wall motion in conductive, soft thin films. The micromagnetic Landau-Lifshitz equation and Maxwell's equation are solved simultaneously to provide a rigorous description of magnetization dynamics interacting with eddy current, which is relevant to the dynamic response of thin film inductive heads. Simulation results indicate that for Permalloy films thinner than 3000 AA, eddy current damping can be neglected in wall dynamics. For film thickness greater than 1 mu m this damping effect could be the dominating loss mechanism.<
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