In this work we studied the origin of the stripe domains at remanence for an anisotropic nanostructured magnetic bar of Cobalt using a dynamical simulation approach developed recently [1]. In the study we find that different remnant states are obtained for different field histories. None of the different remnant states is the lowest energy state. This indicates that the energy minimization consideration first proposed by Landau and Lifshitz [2] is not adequate to predict the final stripe domain pattern at remanence in this situation. By calculating the magnetic normal modes at high external fields, we find that a particular standing-wave-like bulk mode always has the lowest frequency of all the standing-wave-like modes, independent of the external field and the length of the bar. This mode also has the same spatial pattern as the stripe domains at remanence and goes soft at the field where the stripe domains emerge. We show, therefore, that the final domain structure at low field can be predicted from a high-field analysis of the frequencies of the standing-wave-like modes.
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