Patent ID: 8916391

Claim:
A radio-frequency device operating between 1 GHz and 20 GHz, wherein at least one magneto-dielectric element comprises a composite thin film comprising a layer of magnetic material offering permeability above 10 at 1 GHz with a thickness of between 10 and 100 nanometers and a dielectric material made of a polycrystalline perovskite offering permittivity above 10 at 1 GHz with a thickness of between 10 and 100 nanometers, said polycrystalline perovskite being deposited by ion beam sputtering in a vacuum enclosure, wherein the magnetic material is constituted by ferromagnetic layers coupled via exchange coupling with antiferromagnetic layers, and wherein the layers of ferromagnetic and antiferromagnetic material are stacked and separated from the dielectric material by at least one intermediate layer, acting as a growth layer or protection layer.