Real magnonic crystals—periodic magnetic media for spin-wave (magnon) propagation—may contain some defects. We report theoretical spin-wave spectra of a one-dimensional magnonic crystal with an isolated defect. The latter is modeled by insertion of an additional layer with thickness and magnetic anisotropy values different from those of the magnonic crystal constituent layers. The defect layer leads to appearance of several localized defect modes within the magnonic band gaps. The frequency and the number of the defect modes may be controlled by varying parameters of the constituent layers of the magnonic crystal.

Topics
Magnetic anisotropy, Magnetic ordering, Magnons, Superlattices, Phononic crystal, Newtonian mechanics, Photonic crystals, Spectroscopy, Coordinate system, Leptons
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© 2006 American Institute of Physics.
2006
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