Fe/sub 70/B/sub 15/Si/sub 15//SiO/sub 2/-type multilayers for magneto-surface-acoustic-waves devices

In this paper we study the magnetic (saturation magnetization M_s, magnetic anisotropy constant k_u) and magnetoelastic (ME) (saturation magnetostriction λ_s, magnetoelastic coupling coefficient b^y,2, magnetostrictive strain coefficient D and ΔE/E ratio) properties of [amorphous Fe₇₀B₁₅Si₁₅/SiO₂]_N multilayers for their application in magneto-surface-acoustic-waves (MSAWs) devices obtained by thin film technology. The present investigation of the [amorphous Fe₇₀B₁₅Si₁₅/SiO₂]_N multilayered films establishes the optimum values of geometrical parameters as: the stacking number, N=15, the insulating layer thickness, d_I=0.01 μm and amorphous Fe₇₀B₁₅Si₁₅ layer thickness, d_M=0.375 μm. We demonstrate that the relevant properties of the waveguide for MSAWs device can be considerably improved using the [amorphous Fe₇₀B₁₅Si₁₅/SiO₂]15 multilayers as waveguide in comparison with Fe₇₀B₁₅Si₁₅ amorphous thin films with single-layer structure presently in use.