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We demonstrate composite media with ferromagnetic wires that exhibit afrequency region at the microwave regime with scattering spectra stronglydependent on an external magnetic field or stress. These tunable compositematerials have recently been proposed theoretically; however, no directexperimental verification has been reported. We used composite materials withpredominantly oriented CoFeCrSiB glass-coated amorphous wires having largemagnetoimpedance at GHz frequencies. The free space measurements of reflectionand transmission coefficients were conducted in the frequency range 1-8 GHz inthe presence of an external static magnetic field or stress applied to thewhole sample. In general, the transmission spectra show greater changes in therange of 10dB for a relatively small magnetic field of few Oe or stress of 0.1MPa. The obtained results are quantitatively consistent with the analyticalexpressions predicted by the effective medium arguments. The incidentelectromagnetic wave induces an electrical dipole moment in each wire, theaggregate of which forms the effective dipole response of the whole compositestructure in the radiative near or far field region. The field and stressdependences of the effective response arise from a field or tensile stresssensitivity of the ac surface impedance of a ferromagnetic wire. In thevicinity of the antenna resonance the variations in the magneto-impedance ofthe wire inclusions result in large changes of the total effective response. Anumber of applications of proposed materials is discussed including the fieldtunable microwave surfaces and the self-sensing media for the remotenon-destructive evaluation of structural materials

physical review. b, condensed matter and materials physics

Experimental demonstration of tunable scattering spectra at microwave frequencies in composite media containing CoFeCrSiB glass-coated amorphous ferromagnetic wires and comparison with theory