Abstract

The wave dispersion relations of the mixed polariton-photon modes propagating within the bulk and along the surface of a semi-infinite magnetic/nonmagnetic layered structure with an alternating arrangement of the magnetization are calculated. The magnetic layers are magnetized to saturation along the uniaxial anisotropy axis, and the waves are considered to propagate transverse to this axis. The results are contrasted with those calculated for a layered structure in which the magnetization in each layer is parallel to each other. For the antiparallel case there evolve modes of wave propagation which assume different dispersion forms when compared to the parallel case. In the parallel case all dispersion branches that exist in the magnetostatic limit coalesce to a single branch, and we find that in the antiparallel case this coalescence is preceded by formation of degenerate branch pairs before this limit is reached. We find that for the antiparallel case some dispersion bands and curves occur at lower frequencies. This is referred to as the "pushing-down" effect. It is proposed that this "pushing-down" effect is due to the vanishing of the rf demagnetization field within the propagating wave fronts. We also predict a new type of surface propagating mode whose appearance is unique to the Kittel, rather than the Voigt, configuration.

Notes

Originally published in Physical Review B 39, 6831-6839 (1989). doi 10.1103/PhysRevB39.6831 (http://link.aps.org/doi/10.1103/PhysRevB39.6831).

Keywords

nonmagnetic materials, wave dispersion, antiparallel magnetization, multilayered structures, polariton photon modes, magnetic layers, anisotropy, surface retarded modes, bulk modes

Subject Categories

Magnetic materials, Magnetization

Disciplines

Electromagnetics and photonics

Publisher

American Physical Society

Publication Date

4-1-1989

Rights Information

Copyright 1989 American Physical Society

Rights Holder

American Physical Society

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