The composite magnetic materials with a superstructure (magnetic photonic crystals) are actively investigated in view of the conditions of electromagnetic wave transmission [1, 2]. Some of these materials are the acoustically continuous media and then can be considered as magnetic phononic crystals (MPC). However, the acoustic dynamic peculiarities of such structures have been disregarded.

In this work the influence of magnetoelastic interaction on the normal SH modes spectrum of the semifinite 1D MPC with mechanically free surface has been analyzed using the transfer matrix method . In particular, the two-component magnetic superlattice similar to “easy axis ferromagnetic - nonmagnetic dielectric” structure and the MPC similar to “easy axis antiferromagnetic – ideal superconductor” structure were studied. For the represented data we assumed that elastic properties of magnetic and nonmagnetic components of the MPC are identical. Especially (it is necessary to specify that the undermentioned features are determined the magnetoelastic interaction influence):

(i) the existence conditions and dispersion relation for the three case of the surface acoustic SH-waves formation nearby the magnetic superlattice surface have been determined;

(ii) the criterion of a nonreflection transmission of shear bulk elastic wave through the semifinite acoustically continuous superlattice has been formulated;

(iii) the collective shear surface acoustic wave spectrum and the condition of nonreflection transmission can have a nonreciprocity relative to the inversion of the direction of SH-wave propagation along the MPC surface.

[1]  I.L. Lyubchanskii, N.N. Dadoenkova, M.I. Lyubchanskii, E.A. Shapovalov, Th. Rasing, J. Phys. D: Appl. Phys., 36 (2003)  R277.

[2]  B. Bernard, Single-particle nanomagnetism, Solid State Sciences, 7 (2005) P. 668.

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1. Amplification of evanescent acoustic waves by the layer of 2D magnetic composite