Broadband GHz frequency characterizations of Permalloy nanorods' array

The radio frequency characteristics of Permalloy nanorods' array have been examined by coplanar waveguide (CPW) cell. The Permalloy nanorods' array was grown in anodic aluminum oxide porous templates with a diameter of ∼20 nm. As the Permalloy nanorods' array was placed on CPW, the characteristic impedances of the CPW were changed from 50 to 38Ω at 1 GHz. The magnitude of inductance was decreased from 3 GHz and the capacitance was increased up to twice in comparison with that of CPW. The signal attenuations were abruptly increased over 1 GHz. The propagation wavelengths due to the insertion of Permalloy nanorods' array were decreased about 30% at 1 GHz in comparison with that of CPW without magnetic materials.