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arXiv 1202.6162cond-mat.mtrl-sci
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单轴薄膜中的磁畴理论

Theory of magnetic domains in uniaxial thin films

F. Virot, L. Favre, R. Hayn, M. D. Kuz'min

摘要:

对于单轴易轴薄膜,磁畴的性质通常在Kittel模型中描述,该模型假设畴壁比畴薄得多。在这项工作中,我们提出了一个简单的模型,其中包括一个适当的描述域和畴壁的静磁能,并考虑到薄膜的两个表面之间的相互作用。我们的模型描述了作为膜厚度的函数的域和壁宽度的行为,并且特别适合于强条纹相。我们证明了存在一个临界值的磁晶各向异性条纹域存在于任何薄膜厚度和证明我们的模型与精确的结果进行比较。该模型与hcp钴的实验数据符合得很好。

英文摘要:

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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