Theory of magnetic domains in uniaxial thin films

Details Theory of magnetic domains in uniaxial thin films Theory of magnetic domains in uniaxial thin films

2012-02-28

arxiv.org/abs/1202.6162v2

Physics

Condensed Matter

Materials Science

15 pages, 7 figures

Scientific paper

For uniaxial easy axis films, properties of magnetic domains are usually described within the Kittel model, which assumes that domain walls are much thinner than the domains. In this work we present a simple model that includes a proper description of the magnetostatic energy of domains and domain walls and also takes into account the interaction between both surfaces of the film. Our model describes the behavior of domain and wall widths as a function of film thickness, and is especially well suited for the strong stripe phase. We prove the existence of a critical value of magneto-crystalline anisotropy above which stripe domains exist for any film thickness and justify our model by comparison with exact results. The model is in good agreement with experimental data for hcp cobalt.

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