Abstract
We are interested in thin-film samples in micromagnetism, where the magnetization m is a 2-d unit-length vector field. More precisely we are interested in transition layers which connect two opposite magnetizations, so called Néel walls.
We prove stability of the 1-d transition layer under 2-d perturbations. This amounts to the investigation of the following singularly perturbed energy functional:
The topological structure of this two-dimensional problem allows us to use a duality argument to infer the optimal lower bound. The lower bound relies on an ε-perturbation of the following logarithmically failing interpolation inequality
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Mathematics Subject Classification (2000) Primary: 49S05, Secondary: 78A30, 78M30
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DeSimone, A., Knüpfer, H. & Otto, F. 2-d stability of the Néel wall. Calc. Var. 27, 233–253 (2006). https://doi.org/10.1007/s00526-006-0019-z
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DOI: https://doi.org/10.1007/s00526-006-0019-z