Magnetoelastic ground state and waves in ferromagnet-nonmagnetic dielectric multilayer structures

Abstract

The periodic magnetoelastic ground state that spontaneously arises due to the magnetoelastic and thermoelastic interactions between layers of a multilayer structure is studied. Properties of this state, such as the equilibrium static elastic strains of the layers of the multilayer structure, the orientation of the static part of the magnetization of these layers depending on the value and orientation of the magnetic field and the temperature, are calculated. It is shown that the magnetoelastic ground state gives rise to three new terms in the energy, which describe different types of the effective magnetic anisotropy. Effects of the initial periodic inhomogeneities of the magnetic and elastic parameters as well as effects of the static periodic elastic stresses resulting from the spontaneous ground state on the spectrum of magnetoelastic waves and on the ferromagnetic resonance frequency of the multilayer structure are investigated.