Abstract

In this paper, on the basis of a micromagnetic, phenomenlogical theory, the spin structures in materials with predominantly indirect exchange interaction are derived from a unique theory. The conditions for the appearance of the stray-field free conical and helical spin structures are derived as well as the conditions for the formation of the sinusoidal and antiphase spin structures which are characterized by magnetic volume charges. In particular it is shown that the formation of sinusoidal, linear spin density waves at 0 K can only be explained by a highly anisotropic exchange integral.

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