Patent ID: 7791250

Claim:
A method comprising: providing a device that includes: at least one ferromagnetic element having a ferromagnetic resonance frequency ν FMR and being capable of magneto-elastic energy conversion; and a layer comprising piezoelectric material, the layer being adapted for transporting a surface acoustic wave having a frequency ν SAW ; wherein the layer comprising piezoelectric material is in contact with the at least one ferromagnetic element and the surface acoustic wave frequency ν SAW is substantially equal to the ferromagnetic resonance frequency ν FMR or an integer multiple of the ferromagnetic resonance frequency ν FMR ; generating a surface acoustic wave in the layer comprising piezoelectric material, such that the surface acoustic wave interacts with the ferromagnetic element to influence a magnetization of the ferromagnetic element; dynamically measuring a variation of a characteristic parameter influenced by the ferromagnetic element; deriving, from the variation of the characteristic parameter, a corresponding value of a measured quantity.