Abstract
Magnonic Crystals (MCs) are a new class of magnetic nanostructures. The periodic modulation of at least one ferromagnetic material can be seen as a MC. In general, MCs can be divided in thin film magnonic crystals and bulk magnonic crystals, while every of these two classes can be subdivided in 1, 2 and 3 dimensional magnonic crystals. Bulk MCs were used in an early stage for theoretical studying. While neglecting effects of the external shape, they are systems which helped to lead up simple and analytical models. On the other hand thin film MCs can be used to study band information mechanisms. In analogue way to photonic crystals, MCs also have the opportunity to show a band structure with allowed minibands and forbidden bandgaps. For photonic crystals this led to photonic circuits and for MCs this can lead to new applications like spin filters, where the forbidden frequency gaps of the MCs could be used to eliminate specific frequencies of spin waves.
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