Abstract
High-frequency properties of magnetic microwires in glass coating and related applications are discussed. In ferromagnetic wires with a spiral type of magnetic anisotropy, the permeability spectra are very wide, and the permeability values may substantially differ from unity in the GHz frequency band. This makes the wires attractive to those trying to design artificial magnetic dielectrics with enhanced and tunable permeability. The applications include controllable absorbing or shielding materials and microwave left-handed materials. This type of anisotropy also results in a large and sensitive magnetoimpedance (MI) effect. Composites with MI wires could be used to engineer a dielectric response that depends on external stimuli including magnetic, mechanical, and thermal forces. This has potential for applications in structural health monitoring.
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