“…It should also be mentioned that the magnetoelastic (ME) interaction exerts essential influence on the spin state of 2d magnetically ordered system. This influence may reveal itself both in the hybridization of the elastic and magnetic excitations [11] and in the formation of the new phase states [12]. And, as experimental data show [13], the ME interaction in Fe 1Àx Co x alloy also depends on Co concentration, like the singleion anisotropy.…”