Les matériaux magnétiques hyperfréquences à lʹère des métamatériaux

This article investigates the advances brought by metamaterials in order to obtain attractive magnetic microwave properties. Can magnetic metamaterials outperform conventional soft magnetic materials? In the case where permeability levels and bandwidth are the key figures of merit, it is acknowledged that copper-based metamaterials can exceed the performance of soft magnetic materials, but only at operating frequencies above 10 GHz. As for low frequency operation, magnetic metamaterials may also be preferred to conventional magnetic materials when requirements include excellent temperature stability or immunity to external magnetic fields. However, in many cases, metamaterials need to include certain conventional magnetic constituents in order to compete with conventional magnetic materials. Several types of metamaterials containing conventional magnetic inclusions and well suited for industrial production are presented. Last but not least, it is underlined that the investigations on metamaterials are beneficial to scientific exchanges between scientists from different areas. To cite this article: O. Acher, C. R. Physique 10 (2009).