Temperature Dependence of Magnetoelastic Sensitivity in Polycrystalline, Amorphous and Multilayer Samples

We have shown that magnetoelastic coefficients can be obtained by magnetoelastic wave amplitude and permeability measurements. This indirect method was applied to investigate magnetoelastic behaviour of a Co-P multilayer down to the liquid nitrogen temperature. The Co-P overlayers were obtained by electrolytic deposition and were composed of magnetic layers separated by non-magnetic thin films. The comparison with an amorphous single layer and a polycrystalline material is also reported. In multilayers a slight decrease of stress sensitivity with temperature had been observed which is explained as an effect of the decrease of the magnetic exchange among the magnetic layers.