Magnetostrictive surface acoustic wave devices with transducers tuned for optimal magnetic anisotropy
AssigneeAgere Systems Optoelectronics Guardian Corp.
InventorKenneth Alexander Ellis
Life of this patent
Estimating the term…
Abstract
In accordance with the invention, magnetostrictive saw devices are provided with tunable transducer structures for enhanced performance. The transducers are in the form of patterned conductors disposed between magnetic films. The magnetostrictive response is tuned by adjusting the thickness of magnetic film overlying the conductive layer.
Claims5
In a magnetostrictive surface acoustic wave device for operation at a frequency ƒOP comprising a substrate, a layer of magnetostrictive material, an input transducer coupled to the layer for generating surface acoustic waves along the layer and an output transducer for receiving the acoustic waves, each transducer comprising a patterned composite of a conductive layer disposed over the magnetostrictive layer and a magnetic layer overlying the conductive layer, the device having a ferromagnetic resonance frequency ƒFMR,
- the improvement wherein the thickness of the overlying magnetic layer is adjusted to provide the ratio ƒFMR/ƒOP in the range 1.05 to 4.0.
Dependencies are inferred from the claim text.