Measurement of the high-frequency giant magnetoresistance of nanostructures in the traveling-wave mode

The change that occurs under the action of an external magnetic field in the propagation constant of the H ₁₀ mode of a rectangular waveguide containing a metallic nanostructure is investigated. Expressions for the complex reflection and transmission coefficients are derived. The dependence of the reflection coefficient on the intensity of the external magnetic field is analyzed. It is shown that experimental values of the propagation constant or the reflection and transmission coefficients can be used for estimation of the value of the microwave magnetoresistance of nanostructures. Experiments on the measurement of the reflection and transmission coefficients in a waveguide with an (Fe/Cr)_n nanostructure are performed in the millimeter and centimeter wave bands.